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  • 1.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Alunskiffer – avfall eller råvara?: vittring och lakbarhet vid naturligt pH-intervall2014Conference paper (Other academic)
  • 2.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Passive barriers as a tool to treat environmental pollution2012In: / [ed] Mattiasson B, 2012, p. 50-51Conference paper (Refereed)
  • 3.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Sustainable Business Mälardalen: sustainable environmental technology in a global arena2012Conference paper (Other academic)
  • 4.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Uranbrytning i Sverige: ett miljöproblem?2009Conference paper (Refereed)
  • 5.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Andrusikiewicz, Waclaw
    Bäckström, Mattias
    Örebro University, School of Science and Technology.
    Bilstad, Torleiv
    Cala, Marek
    Cholewa, Marcin
    Drielsma, Johannes
    Galos, Krzysztof
    Gehör, Seppo
    Karu, Veiko
    Kotarska, Izabela
    Koch, Lutz
    Kreisel, Stefan
    Kuiala, Kauko
    Kulczycka, Joanna
    Ostrega, Anna
    Repo, Hanna
    Sädbom, Stefan
    Szcech, Anna
    Szlugaj, Jaroslaw
    Szmigielski, Piotr
    Swierczynski, Wieslaw
    Uberman, Ryszard
    Valgma, Ingo
    Wrzosek, Krzysztof
    Mining waste management in the Baltic Sea Region: Min-Novation project2013Book (Refereed)
    Abstract [en]

    Mining waste and what to do about it is a common challenge facing companies, local authorities, environmental organizations, policymakers and increasingly other stakeholders in several countries of the Baltic Sea Region. From 2011 to 2013, a network of scientific and regional expertise brought together in the Min-Novation project has put this topic in the spotlight. The importance of the management of waste from extractive industries is due to the substantial share this waste has in the overall stream of waste generated in the EU. In 2010, 672 Mt or 28.3% of the total waste generated in the EU was attributable to the mining and quarrying industry, second only to construction (34.4%) and ahead of manufacturing (11.0%) and households (8.7%)1. Apart from this, mining waste is the raw material for one of the more visible man-made landmarks that surround us, with waste heaps of various shapes and sizes dotting the landscape up and down the Baltic Sea Region. Despite this dual prominence, mining waste is most often seen only as an environmental problem and in no way a resource. To move away from a one-sided view of mining waste, a life-cycle approach, which recognises that value can be recovered from waste and re-introduced into the product cycle is of the essence. It cannot be stressed enough that mining waste is a source of secondary raw materials, the use of which helps to protect the natural mineral deposits for future generations. Equally important is an appreciation of how the waste can be re-cycled in the excavation process (preventionand recovery) and adapted to create value for local communities (reclamation and revitalisation). However, for there to be effective mining waste management, both in the prevention stage, as well as in the recovery stage, and finally during land reclamation many conditions must be fulfilled. Of these the most important are access to appropriate technologies and methods and common sense legislation. Another condition not without importance is social acceptance for the recovery of waste located in old landfills. The Min-Novation Network over a span of 3 years has worked to understand and appreciate mining waste both as a corporate, community, regulatory and strategic issue. Set against the background of mining activity and waste management in the partner countries: Estonia, Finland, Germany, Norway, Poland and Sweden, both good practices and problem areas, which need to be addressed have been presented in this monograph. The purpose of this monograph is to show a cross-section of topics that affect how mining waste management works today, and which will play a decisive role in whether management of mining waste remains – an issue of primarily local relevance or whether it becomes a growth opportunity of national and EU-wide importance. The monograph focuses primarily on issues related to the management of waste from extractive industries in the countries whose representatives were involved in the Min-Novation project. Examples from outside the Baltic Sea Region of the use of waste heaps as an industrial heritage of the mining regions and also as attractions for local communities are presented as well. Indeed, every experience is valuable for the environment and socio-economic development of the Baltic Sea Region.

  • 6.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Borchadt, D.
    Burri, P.
    Grigelis, A.
    Growitsch, C.
    Kalaydjian, F.
    Mair, R.
    Maisonnier, G.
    Pawlowski, L.
    Reichetseder, P.
    Swennen, R.
    Norton, M.
    Shale gas extraction: issues of particular relevance to the European Union2014Report (Other academic)
  • 7.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Bäckström, Mattias
    Örebro University, School of Science and Technology.
    Cala, Marek
    Ostreca, A.
    Reclamation and revitalisation of waste dumps or land after waste recovery2013In: Mining waste management in the Baltic Sea Region: Min-Novation project / [ed] Marek Cała, Krakow, Poland: Wydawnictwa AGH , 2013, p. 195-236Chapter in book (Refereed)
  • 8.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Bäckström, Mattias
    Örebro University, School of Science and Technology.
    Häller, Sara
    Örebro University, School of Science and Technology.
    Panova, Elena
    St Petersburgs universitet, St Petersburg, Ryssland.
    Grawunder, Anja
    Friedrich Sciller Univ., Jena, Germany.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Water chemistry and trace metal concentrations in an acidic alum shale pit lake: effects of liming2011In: Mine water: managing the challenges: proceedings of the International Mine Water Association Congress 2011 / [ed] Trude R.Rüde, Antje Freund, Christian Wolkersdorfer, Aachen: RWTH , 2011, p. 503-508Conference paper (Refereed)
  • 9.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Bäckström, Mattias
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Grawunder, Anja
    Institute of Geoscience, Friedrich Schiller University, Jena, Germany .
    Neutralisation of an acidic pit lake by alkaline waste products2014In: Environmental Science and Pollution Research, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 21, no 11, p. 6930-6938Article in journal (Refereed)
    Abstract [en]

    A former open pit where black shale (alum shale) was excavated during 1942-1965 has been water filled since 1966. The water chemistry was dominated by calcium and sulphate and had a pH of 3.2-3.4 until 1997-1998, when pH was gradually increasing. This was due to the intrusion of leachates from alkaline cement waste deposited close to the lake. A stable pH of around 7.5 was obtained after 6-7 years. The chemistry of the pit lake has changed due to the neutralisation. Concentrations of some dissolved metals, notably zinc and nickel, have gone down, as a result of adsorption/co-precipitation on solid phases (most likely iron and aluminium hydroxides), while other metals, notably uranium and molybdenum, are present at elevated levels. Uranium concentration is reaching a minimum of around pH 6.5 and is increasing at higher pH, which may indicate a formation of neutral and anionic uranyl carbonate species at high pH (and total carbonate levels around 1 mM). Weathering of the water-exposed shale is still in progress.

  • 10.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Bäckström, Mattias
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Sartz, Lotta
    Örebro University, School of Science and Technology. Bergskraft Bergslagen AB, Kumla, Sweden.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Sädbom, Stefan
    Bergskraft Bergslagen AB, Kumla, Sweden.
    Control of metal releases from historic sulphidic mine waste: Experience from the test site at the Ljusnarsberg mine field, Sweden (Project Bergskraft Bergslagen)2010In: Proc. EU Mine Drainage Research Exchange Conf. PADRE, June 11, Freiberg, Germany, 2010, p. 1 p-Conference paper (Refereed)
  • 11.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Bäckström, Mattias
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Sartz, Lotta
    Örebro University, School of Science and Technology. Bergskraft Bergslagen AB.
    Sädbom, Stefan
    Bergskraft Bergslagen.
    Strategy for treatment of historic sulphidic mine waste: Experiences from the Ljusnarsberg Mine Field, Sweden2009In: Proc. 12th EuCheMS International Conference on Chemistry and the Environment, June 14-17, Stockholm, 2009, p. 197-Conference paper (Refereed)
  • 12.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Black shale: a biogeochemical archive2014In: Sedimentary Pore Space Cementation: Role of Microbes / [ed] Kothe E, Büchel G, 2014, p. 6-Conference paper (Refereed)
  • 13.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology. Remedy by Sweden AB, Eskilstuna, Sweden; Mälardalen Univ., Västerås, Sweden.
    Hedlund, Jonas
    Structor Miljöteknik AB, Eskilstuna, Sweden.
    Carlsson, Peter
    Remedy by Sweden AB, Eskilstuna, Sweden; Structor Miljöteknik AB, Eskilstuna, Sweden.
    Eriksson, Ingvar
    Remedy by Sweden AB, Eskilstuna, Sweden; Structor Miljöteknik AB, Eskilstuna, Sweden.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology. Remedy by Sweden AB, Eskilstuna, Sweden.
    Metal mobility or metal concentration as the basis for remediation strategy: a case study2014Conference paper (Refereed)
  • 14.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Greis, Christina
    Örebro University, Department of Natural Sciences.
    Pettersson, Håkan
    Linköpng Univ.
    Düker, Anders
    Örebro University, School of Science and Technology.
    Redistribution of Pu, Am, Cs and Np in salt marsh sediment: Wigtown Merse, Irish Sea2009In: 8th International Conference on Methods and Applications of Radioanalytical Chemistry (MARC VIII) / [ed] Rolf Zeisler, Kenan Ünlü, Susan Heller-Zeisler, Melville, N.Y.: American Institute of Physics (AIP), 2009, p. 1-24Conference paper (Refereed)
  • 15.
    Allard, Bert
    et al.
    Örebro University, Department of Natural Sciences.
    Karlsson, Stefan
    Greis, Christina
    Örebro University, Department of Natural Sciences.
    Pettersson, Håkan
    Düker, Anders
    Redistribution pf Pu, Am, Cs and Np in salt marsh sediment - Wigtown Merse, Irish SeaManuscript (Other academic)
  • 16.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Metal loads or metal concentrations as the basis for risk assessment of a polluted site: a case study2013In: Sardinia 2013: executive summaries : proceedings of the fourteenth International Waste Management and Landfill Symposium / [ed] Raffaello Cossu, Pinjing He, Peter Kjeldsen, Yasushi Matsufuji, Debra Reinhart, Rainer Stegmann, Cagliari: CISA , 2013Conference paper (Refereed)
  • 17.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology. Remedy by Sweden AB, Eskilstuna, Sweden; Mälardalen Univ., Västerås, Sweden.
    Martell, Ulrika
    Structor Miljöteknik AB, Eskilstuna, Sweden.
    Andersson, Matilda
    Structor Miljöteknik AB, Eskilstuna, Sweden.
    Nordén, Anna
    Structor Miljöteknik AB, Eskilstuna, Sweden.
    Karlsson, Stefan
    Örebro University, School of Science and Technology. Remedy by Sweden AB, Eskilstuna, Sweden.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Carlsson, Peter
    Remedy by Sweden AB, Eskilstuna, Sweden; Structor Miljöteknik AB, Eskilstuna, Sweden.
    Reduction in situ of chromium(VI) at a heavily polluted site: a feasible remediation strategy2014Conference paper (Refereed)
  • 18.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Paneva, E.
    Saint Petersburg state university, St. Petersburg, Russia.
    Black shales in northern Europe: biogeochemical impact2014In: Biogenic-Abiogenic interactions in natural and anthropogenic systems, 2014Conference paper (Refereed)
  • 19.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Sartz, Lotta
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Bäckström, Mattias
    Örebro University, School of Science and Technology.
    Metal releases from historic sulphidic mine site (Ljusnarsberg, Sweden): mobilization and attenuation processes2008Conference paper (Refereed)
  • 20.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Sjöberg, Susanne
    Department of Geological Sciences, Stockholm University, Stockholm, Sweden.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Skogby, Henrik
    Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Metal Exchangeability in the REE-Enriched Biogenic Mn Oxide Birnessite from Ytterby, Sweden2023In: Minerals, E-ISSN 2075-163X, Vol. 13, no 8, article id 1023Article in journal (Refereed)
    Abstract [en]

    A black substance exuding from fractures was observed in 2012 in Ytterby mine, Sweden, and identified in 2017 as birnessite with the composition Mx[Mn(III,IV)](2)O-4 center dot(H2O)n. M is usually calcium and sodium, with x around 0.5. The Ytterby birnessite is unique, with M being calcium, magnesium, and also rare earth elements (REEs) constituting up to 2% of the total metal content. The biogenic origin of the birnessite was established in 2018. Analysis of the microbial processes leading to the birnessite formation and the REE enrichment has continued since then. The process is fast and dynamic, as indicated by the depletion of manganese and of REE and other metals in the fracture water during the passage over the precipitation zone in the mine tunnel. Studies of the exchangeability of metals in the structure are the main objective of the present program. Exposure to solutions of sodium, calcium, lanthanum, and iron led to exchanges and altered distribution of the metals in the birnessite, however, generating phases with almost identical structures after the exchanges, and no new mineral phases were detected. Exchangeability was more efficient for trivalent elements (REE) over divalent (calcium) and monovalent (sodium) elements of a similar size (ionic radii 90-100 pm).

  • 21.
    Arwidsson, Zandra
    et al.
    Örebro University, School of Science and Technology. SAKAB AB, Kumla, Sweden.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Remediation of Metal-Contaminated Soil by Organic Metabolites from Fungi II-Metal Redistribution2010In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 207, no 1-4, p. 5-18Article in journal (Refereed)
    Abstract [en]

    Exudation of low molecular weight organic acids by fungi was studied in a project focusing on bioremediation of metal-contaminated soils. The production of acids (mainly oxalic and citric acid) as a response to nutrient variations and presence of metals has recently been reported (Arwidsson et al. 2009). A significant release of metals was observed and was related not only to the production of organic acids but also to the resulting pH decrease in the systems. The processes governing the release and redistribution of metals in the soil-water fungus system were the focus of the present continuation of the project, based on observations of Aspergillus niger, Penicillium bilaiae, and a Penicillium sp. The release of lead was 12% from the soil with the second highest initial load (1,600 mg kg(-1)), while the release of copper was 90% from the same soil (140 mg kg(-1)). The dominating mechanism behind the release and subsequent redistribution was the change in pH, going from near neutral to values in the range 2.1-5.9, reflecting the production of organic acids. For some of the systems, the formation of soluble complexes is indicated (copper, at intermediate pH) which favors the metal release. Iron is assumed to play a key role since the amount of secondary iron in the soils is higher than the total load of secondary heavy metals. It can be assumed that most of the heavy metals are initially associated with iron-rich phases through adsorption or coprecipitation. These phases can be dissolved, or associated metals can be desorbed, by a decrease in pH. It would be feasible to further develop a process in technical scale for remediation of metal-contaminated soil, based on microbial metabolite production leading to formation of soluble metal complexes, notably with copper.

  • 22.
    Arwidsson, Zandra
    et al.
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Elgh-Dalgren, Kristin
    Örebro University, School of Science and Technology.
    van Hees, Patrick
    Örebro University, School of Science and Technology.
    Recycling of amino polycarboxylic acids in soil washing of heavy metal contaminated soilManuscript (preprint) (Other academic)
  • 23.
    Arwidsson, Zandra
    et al.
    SAKAB AB, Kumla, Sweden.
    Elgh-Dalgren, Kristin
    Örebro University, School of Science and Technology.
    Nehrenheim, Emma
    School of Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Odlare, Monica
    School of Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Ribé, Veronica
    School of Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Sjöberg, Ragnar
    Solventic AB, Motala, Sweden.
    von Kronhelm, Tomas
    SAKAB AB, Kumla, Sweden.
    van Hees, Patrick
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Remediation of soils and sludges containing organic contaminants as well as metals – soil-wash procedures combining biodegradation, chemical complexation and mechanical separation of particulate matter2009Conference paper (Refereed)
    Abstract [en]

    Soil contamination is an urgent issue world wide. More than 83,000 contaminated sites have been identified in Sweden alone, of which approximately some 4,000 require treatment in the near future. Most of the sites carry a mixture of contaminants, metals as well as persistent organics. Most soil remediation efforts are made ex situ, which means that the soil or sludge is dug up and transported to a facility for treatment, or simply for deposition. The aim of the present project is to design a strategy for ex situ treatment of soils with mixed contaminants. A variety of soils and sludges from different sites (around 10), essentially all with organic as well as inorganic (metallic) contaminants, have been selected for experimental studies in laboratory and pilot scale: Military sites (metals, explosives), wood preservation sites (PAHs, As, metals), industrial sites (metals, hydrocarbons, mercury, dioxins and others). Of particular importance in the present study are:

    Metals – Pb, Cu, Zn, Cr, Hg, as well as As Organics – PAHs, nitro aromatics, dioxins

    A number of processes are selected and applied: •Biodegradation - use of commercially available cultures, as well as bacteria cultivated from the contaminated site itself •Mobilisation of organics - use of surface active agents •Mobilisation of metals - use of (1) complexing microbial metabolites produced in the soil (by fungii in paricular), (2) complexing agents generated by degradation of natural organic products (polyhydroxy carboxylic acids), and (3) artificial complexing agents (polyamino carboxylic acids).

    Biodegradation is performed in batches (anaerobic in most cases), while release and mobilisation of contaminants from soil aggregates are achieved during soil-wash performed in a dynamic system where wash solution is forced through the soil under high pressure (the WTC-process). The efficiency of biodegradation and subsequent soil-wash under various conditions is evaluated from chemical analysis, but also by several ecotoxicological tests. Some results are given that illustrates suitable strategies for treatment of mixed contaminated soil from real sites (soil) as well as for treatment of residues from industrial production (sludges etc).

  • 24.
    Arwidsson, Zandra
    et al.
    Örebro University, School of Science and Technology. SAKAB AB, Kumla, Sweden.
    Elgh-Dalgren, Kristin
    Örebro University, School of Science and Technology.
    von Kronhelm, Thomas
    SAKAB AB, Kumla, Sweden.
    Sjoberg, Ragnar
    Solvent AB, Motala, Sweden.
    Allard, Bert
    Örebro University, School of Science and Technology.
    van Hees, Patrick A. W.
    Örebro University, School of Science and Technology.
    Remediation of heavy metal contaminated soil washing residues with amino polycarboxylic acids2010In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 173, no 1-3, p. 697-704Article in journal (Refereed)
    Abstract [en]

    Removal of Cu, Pb, and Zn by the action of the two biodegradable chelating agents [S,S]-ethylenediaminedisuccinic acid (EDDS) and methylglycinediacetic acid (MGDA), as well as citric acid, was tested. Three soil samples, which had previously been treated by conventional soil washing (water), were utilized in the leaching tests. Experiments were performed in batches (0.3 kg-scale) and with a WTC-mixer system (Water Treatment Construction, 10 kg-scale). EDDS and MGDA were most often equally efficient in removing Cu, Pb, and Zn after 10-60 min. Nonetheless, after 10 d, there were occasionally significant differences in extraction efficiencies. Extraction with citric acid was generally less efficient, however equal for Zn (mainly) after 10 d. Metal removal was similar in batch and WTC-mixer systems, which indicates that a dynamic mixer system could be used in full-scale. Use of biodegradable amino polycarboxylic acids for metal removal, as a second step after soil washing, would release most remaining metals (Cu, Pb and Zn) from the present soils, however only after long leaching time. Thus, a full-scale procedure, based on enhanced metal leaching by amino polycarboxylic acids from soil of the present kind, Would require a pre-leaching step lasting several days in order to be efficient. (C) 2009 Elsevier B.V. All rights reserved.

  • 25.
    Arwidsson, Zandra
    et al.
    Örebro University, School of Science & Technology, Örebro, Sweden; SAKAB AB, Kumla, Sweden.
    Johansson, Emma M.
    Örebro University, School of Science and Technology.
    von Kronhelm, Thomas
    SAKAB AB, Kumla Sweden.
    Allard, Bert
    Örebro University, School of Science and Technology.
    van Hees, Patrick A. W.
    Örebro University, School of Science and Technology. Eurofins Environment Sweden AB, Lidköping, Sweden.
    Remediation of Metal Contaminated Soil by Organic Metabolites from Fungi I—Production of Organic Acids2008In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 205, no 1-4, p. 215-226Article in journal (Refereed)
    Abstract [en]

    Investigations were made on living strains offungi in a bioremediation process of three metal (lead)contaminated soils. Three saprotrophic fungi (Aspergillusniger, Penicillium bilaiae, and a Penicillium sp.) wereexposed to poor and rich nutrient conditions (no carbonavailability or 0.11 M D-glucose, respectively) andmetal stress (25 μM lead or contaminated soils) for5 days. Exudation of low molecular weight organicacids was investigated as a response to the metal andnutrient conditions. Main organic acids identified wereoxalic acid (A. niger) and citric acid (P. bilaiae).Exudation rates of oxalate decreased in response tolead exposure, while exudation rates of citrate were lessaffected. Total production under poor nutrient conditionswas low, except for A. niger, for which nosignificant difference was found between the poor andrich control. Maximum exudation rates were 20 μmoloxalic acid g^−1 biomass h^−1 (A. niger) and 20 μmolcitric acid g^−1 biomass h^−1 (P. bilaiae), in the presenceof the contaminated soil, but only 5 μmol organic acidsg^−1 biomass h^−1, in total, for the Penicillium sp. Therewas a significant mobilization of metals from the soilsin the carbon rich treatments and maximum release ofPb was 12% from the soils after 5 days. This was notsufficient to bring down the remaining concentration tothe target level 300 mg kg^−1 from initial levels of 3,800,1,600, and 370 mg kg^−1in the three soils. Target levelsfor Ni, Zn, and Cu, were 120, 500, and 200 mg kg^−1,respectively, and were prior to the bioremediationalready below these concentrations (except for Cu Soil1). However, maximum release of Ni, Zn, and Cu was28%, 35%, and 90%, respectively. The release of metalswas related to the production of chelating acids, but alsoto the pH-decrease. This illustrates the potential to usefungi exudates in bioremediation of contaminated soil.Nonetheless, the extent of the generation of organicacids is depending on several processes and mechanismsthat need to be further investigated.

  • 26.
    Arwidsson, Zandra
    et al.
    Örebro University, School of Science and Technology.
    Ålund, Marie
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Leaching of metals from contamined soil with polyhydroxycarboxylic acids of natural originManuscript (preprint) (Other academic)
  • 27.
    Arwidsson, Zandra
    et al.
    SAKAB AB, Norrtorp, Sweden.
    Ålund, Marie
    SAKAB AB, Norrtorp, Sweden.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Metal mobilisation from soils and sediments by hydroxycarboxylic acids of natural origin2011In: Programme and Abstracts: 25th International Applied Geochemistry Symposium, 22-26 August, 2011, Rovaniemi, Finland / [ed] Pertti Sarala, V. Juhani Ojala, Marja-Leena Porsanger, Vuorimiesyhdistys - Finnish Association of Mining and Metallurgical Engineers , 2011, p. 77-77Conference paper (Refereed)
  • 28.
    Bäckström, Mattias
    et al.
    Örebro University, Department of Natural Sciences.
    Dario, Mårten
    Örebro University, Department of Natural Sciences.
    Allard, Bert
    Örebro University, Department of Natural Sciences.
    Karlsson, Stefan
    Örebro University, Department of Natural Sciences.
    Effects of a fulvic acid on the adsorption of mercury and cadmium on goethite2003In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 304, no 1-3, p. 257-268Article in journal (Refereed)
    Abstract [en]

    The effects of an aquatic fulvic acid on the pH-dependent adsorption of Hg(II) and Cd(II) to particulate goethite (a-FeOOH) were studied in batch systems. The ionic medium consisted of 0.01 M HClO and the total concentrations 4 of mercury and cadmium were maintained at 10y8 M with 203Hg and 109Cd as tracers. pH In the systems was varied in the range 3–10 by addition of HClO and NaOH.All commercial chemicals were of analytical grade or better. An 4 aquatic fulvic acid (20 ppm), previously isolated and characterised in detail, was used as a model for humic substances and its adsorption to goethite is included in this study. The adsorption of the fulvic acid (20 ppm) onto goethite decreased slowly from 90% at pH 3–7.5 to 10% at pH 10. In systems without fulvic acid the adsorption of mercury increased in a linear fashion from 10% at pH 3 to 70% at pH 10.In the presence of fulvic acid (20 ppm), the adsorption was almost quantitative in the intermediate pH range (pH 5–7), and exceeded 92% over the entire pH range. Thus, association between mercury and the fulvic acid enhanced adsorption in general although the largest impact was found at low pH.Adsorption of cadmium increased from nearly 0 to almost 100% at approximately pH 6. In the presence of fulvic acid, the adsorption increased below pH 7 and decreased above pH 7. The adsorption isotherm for mercury when the concentration was increased from 10y8 to 1.8=10y4 M showed a corresponding increase of K (lyg) up to a total concentration at 10y6 M.At higher mercury concentrations K was lowered. In the presence of fulvic acid the corresponding relationship of K was bi-modal, i.e. high values at low and intermediate concentrations of mercury. This behaviour suggests that in the absence of fulvic acid the adsorption follow the expected behaviour, i.e. adsorption sites with similar affinity for mercury. In the presence of fulvic acid, additional adsorption sites are available by the organic molecule (possibly sulfur groups) when it is associated to the goethite. The adsorption isotherm for cadmium indicates a lowering of K at 10y4 M. Cadmium had no competitive effect on mercury and vice versa. Zinc, however, affected the adsorption of cadmium but not the adsorption of mercury.

  • 29. Bäckström, Mattias
    et al.
    Dario, Mårten
    Örebro University, Department of Natural Sciences.
    Karlsson, Stefan
    Allard, Bert
    Örebro University, Department of Natural Sciences.
    Effects of a fulvic acid on the adsorption of mercury and cadmium on goethite2003In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 304, no 1-3, p. 257-268Article in journal (Refereed)
    Abstract [en]

    The effects of an aquatic fulvic acid on the pH-dependent adsorption of Hg(II) and Cd(II) to particulate goethite (alpha-FeOOH) were studied in batch systems. The ionic medium consisted of 0.01 M HClO(4) and the total concentrations of mercury and cadmium were maintained at 10(-8) M with 203Hg and 109Cd as tracers. pH In the systems was varied in the range 3-10 by addition of HClO(4) and NaOH. All commercial chemicals were of analytical grade or better. An aquatic fulvic acid (20 ppm), previously isolated and characterised in detail, was used as a model for humic substances and its adsorption to goethite is included in this study. The adsorption of the fulvic acid (20 ppm) onto goethite decreased slowly from 90% at pH 3-7.5 to 10% at pH 10. In systems without fulvic acid the adsorption of mercury increased in a linear fashion from 10% at pH 3 to 70% at pH 10. In the presence of fulvic acid (20 ppm), the adsorption was almost quantitative in the intermediate pH range (pH 5-7), and exceeded 92% over the entire pH range. Thus, association between mercury and the fulvic acid enhanced adsorption in general although the largest impact was found at low pH. Adsorption of cadmium increased from nearly 0 to almost 100% at approximately pH 6. In the presence of fulvic acid, the adsorption increased below pH 7 and decreased above pH 7. The adsorption isotherm for mercury when the concentration was increased from 10(-8) to 1.8 x 10(-4) M showed a corresponding increase of K(d) (l/g) up to a total concentration at 10(-6) M. At higher mercury concentrations K(d) was lowered. In the presence of fulvic acid the corresponding relationship of K(d) was bi-modal, i.e. high values at low and intermediate concentrations of mercury. This behaviour suggests that in the absence of fulvic acid the adsorption follow the expected behaviour, i.e. adsorption sites with similar affinity for mercury. In the presence of fulvic acid, additional adsorption sites are available by the organic molecule (possibly sulfur groups) when it is associated to the goethite. The adsorption isotherm for cadmium indicates a lowering of K(d) at 10(-4) M. Cadmium had no competitive effect on mercury and vice versa. Zinc, however, affected the adsorption of cadmium but not the adsorption of mercury.

  • 30.
    Bäckström, Mattias
    et al.
    Örebro University, School of Science and Technology.
    Häller, Sara
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Geochemical processes in a historical alum shale dump, Kvarntorp2011In: Programme and Abstracts / [ed] Sarala P, Ojala VJ, Porsanger M-L, Vuorimiesyhdistys , 2011, p. 97, 6p CD-Rom-Conference paper (Refereed)
  • 31.
    Bäckström, Mattias
    et al.
    Örebro University, Department of Natural Sciences.
    Karlsson, Stefan
    Örebro University, Department of Natural Sciences.
    Allard, Bert
    Örebro University, Department of Natural Sciences.
    Metal leachability and anthropogenic signal in roadside soils estimated from sequential extraction and stable lead isotopes2004In: Environmental Monitoring & Assessment, ISSN 0167-6369, E-ISSN 1573-2959, Vol. 90, no 1-3, p. 135-160Article in journal (Refereed)
    Abstract [en]

    Several roadside soil samples were collected at two field sites in Sweden. They were analysed for total elemental content (using both ICP-MS and XRF) and stable lead isotopes. Extraction with deicing salt solution and sequential extraction were performed in order to elucidate the potential mobility due to the use of deicing agents. The total concentrations of elements, especially lead, have decreased and lead is presently almost at background concentrations (15–51 ppm for surface samples). However, the isotopic signature indicates that old gasoline lead still is left at the site constructed prior to 1975. The field site constructed in 1992 showed, however, no 206Pb/207Pb ratio below 1.14. Only minor amounts were leached using deicing salt solutions; for lead only 0.29%, on average, was extracted indicating that the mobile fraction already was released. Sequential extraction indicated that lead mainly was associated with reducible (34.4%) and oxidisable (35.4%) fractions. Exchangable and acid soluble fractions contained 20.3% while 10.0% was found in the residual fraction. The salt extraction released, however, very low concentrations indicating that most in fraction 1 is acid soluble (e.g. carbonates). Tungsten was also found at high concentrations indicating a possible impact from studded tires. For tungsten the following composition was obtained: residual (48.0%) > oxidisable (47.6%) > reducible (3.3%) > exchangeable/acid soluble (1.1%). From the isotopic studies it was also suggested that the order for incorporating anthropogenic lead into soils is exchangeable/carbonates > (hydr)oxides > organic matter > residual. The multivariate technique principal component analysis (PCA) seems promising for evaluating large sequential extraction datasets.

  • 32.
    Bäckström, Mattias
    et al.
    Örebro University, Department of Natural Sciences.
    Karlsson, Stefan
    Örebro University, Department of Natural Sciences.
    Allard, Bert
    Örebro University, Department of Natural Sciences.
    Mobilisation of lead: field measurements at a trap range compared to solubility experiments2000Conference paper (Refereed)
  • 33.
    Bäckström, Mattias
    et al.
    Örebro University, Department of Natural Sciences.
    Nilsson, Ulrika
    Håkansson, Karsten
    Allard, Bert
    Örebro University, Department of Natural Sciences.
    Karlsson, Stefan
    Örebro University, Department of Natural Sciences.
    Speciation of heavy metals in road runoff and roadside total deposition2003In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 147, no 1-4, p. 343-366Article in journal (Refereed)
    Abstract [en]

    The concentrations of Cd, Co, Cu, Pb, W and Zn were measured in road runoff and total deposition at two Swedish field sites during one year. It was found that the concentrations of most elements increased significantly during the winter, up to one order of magnitude. For cobalt and tungsten, it was found that around 90% of the total mass transport occurred during the winter, whereas for Cu, Pb, Cd, Zn and Na, the corresponding figures were 70–90, 40–80, 60–90, 50–70 and >99% depending on site specific conditions. The deicing salts (rock salts) did not significantly contribute to the increase in trace element concentrations. Instead, the increased concentrations were due to more intense wearing of the pavement during the winter because of the use of studded tires in combination with the chemical effects caused by the use of deicing salts. New potential elemental markers for roads and traffic are suggested.

  • 34.
    Bäckström, Mattias
    et al.
    Örebro University, School of Science and Technology.
    Sartz, Lotta
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Prevention of ARD through stabilization of waste rock with alkaline by-products: results from a meso-scale experiment2010In: Mina Water & Innovative Thinking: proceedings 2010 / [ed] Wolkersdorfer, C. & Freund, A, Nova Scotia, Canada: Cape Breton University Press , 2010, p. 559-563Conference paper (Refereed)
  • 35.
    Chen, Deliang
    et al.
    Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden; Royal Swedish Academy of Sciences, Stockholm, Sweden.
    Rodhe, Henning
    Royal Swedish Academy of Sciences, Stockholm, Sweden; Department of Meteorology, Stockholm University, Stockholm, Sweden; Center of Natural Hazard and Disaster Science, Uppsala, Sweden.
    Emanuel, Kerry
    Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge MA, USA.
    Seneviratne, Sonia, I
    Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland.
    Zhai, Panmao
    Chinese Academy of Meteorological Sciences, Beijing, China.
    Allard, Bert
    Örebro University, School of Science and Technology. Royal Swedish Academy of Sciences, Stockholm, Sweden.
    Berg, Peter
    The Swedish Meteorological and Hydrological Institute (SMHI), Norrköping, Sweden.
    Björck, Svante
    Royal Swedish Academy of Sciences, Stockholm, Sweden; Department of Geology, Lund University, Lund, Sweden.
    Brown, Ian A.
    Department of Physical Geography, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden.
    Bärring, Lars
    The Swedish Meteorological and Hydrological Institute (SMHI), Norrköping, Sweden.
    Chafik, Léon
    Department of Meteorology, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden.
    Deng, Kaiqiang
    Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden.
    Gaillard-Lemdahl, Marie-Jose
    Royal Swedish Academy of Sciences, Stockholm, Sweden; Department of Biology and Environmental Science, Linnaeus University, Kalmar, Sweden.
    Hieronymus, Magnus
    The Swedish Meteorological and Hydrological Institute (SMHI), Norrköping, Sweden.
    Kjellström, Erik
    The Swedish Meteorological and Hydrological Institute (SMHI), Norrköping, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden.
    Linderholm, Hans W.
    Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden.
    May, Wilhelm
    Centre for Environmental and Climate Research, Lund University, Lund, Sweden.
    Näslund, Jens-Ove
    The Swedish Nuclear Fuel and Waste Management Company, Stockholm, Sweden.
    Ou, Tinghai
    Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden.
    Rutgersson, Anna
    Center of Natural Hazard and Disaster Science, Uppsala, Sweden; Department of Earth Sciences, Uppsala University, Uppsala, Sweden.
    Sahlee, Erik
    Department of Earth Sciences, Uppsala University, Uppsala, Sweden.
    Schenk, Frederik
    Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Department for Geological Sciences, Stockholm University, Stockholm, Sweden.
    Sjolte, Jesper
    Department of Geology, Lund University, Lund, Sweden.
    Sporre, Moa K.
    Department of Physics, Lund University, Lund, Sweden.
    Stigebrandt, Anders
    Royal Swedish Academy of Sciences, Stockholm, Sweden; Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden.
    Weyhenmeyer, Gesa A.
    Royal Swedish Academy of Sciences, Stockholm, Sweden; Department of Ecology and Genetics/Limnology, Uppsala University, Uppsala, Sweden .
    Zhang, Peng
    Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden.
    Zhang, Qiong
    Department of Physical Geography, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden.
    Summary of a workshop on extreme weather events in a warming world organized by the Royal Swedish Academy of Sciences2020In: Tellus. Series B, Chemical and physical meteorology, ISSN 0280-6509, E-ISSN 1600-0889, Vol. 72, no 1, article id 1794236Article in journal (Refereed)
    Abstract [en]

    Climate change is not only about changes in means of climatic variables such as temperature, precipitation and wind, but also their extreme values which are of critical importance to human society and ecosystems. To inspire the Swedish climate research community and to promote assessments of international research on past and future changes in extreme weather events against the global climate change background, the Earth Science Class of the Royal Swedish Academy of Sciences organized a workshop entitled 'Extreme weather events in a warming world' in 2019. This article summarizes and synthesizes the key points from the presentations and discussions of the workshop on changes in floods, droughts, heat waves, as well as on tropical cyclones and extratropical storms. In addition to reviewing past achievements in these research fields and identifying research gaps with a focus on Sweden, future challenges and opportunities for the Swedish climate research community are highlighted.

  • 36. Dahlén, Johan
    et al.
    Bäckström, Mattias
    Örebro University, Department of Natural Sciences.
    Ephraim, James
    Borén, Hans
    Allard, Bert
    Örebro University, Department of Natural Sciences.
    Determination of the molecular weight of fulvic acids by UV/VIS spectroscopy1999In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 38, no 4, p. 783-794Article in journal (Refereed)
    Abstract [en]

    Partial least squares (PLS) modeling was applied to investigate number-average molecular weights (Mn) and weight-average molecular weights (Mw) of fulvic acids (FAs) in relation to the corresponding UVNIS spectra. The Mn and Mw values were determined by size exclusion chromatography (SEC). The impact of pH control, wavelength range and density as well as smoothing and derivation of spectra were tested. It was found that PLS models based on absorbance spectra can be a fast and powerful complement to existing techniques employed for determination of molecular weights of FAs. Control of pH of the FA solutions is important for the performance of the models. The models were also compared with the best univariate alternatives.

  • 37.
    Dario, Mårten
    et al.
    Örebro University, Department of Natural Sciences.
    Allard, Bert
    Örebro University, Department of Natural Sciences.
    Sorption of europium onto titanium dioxide at high pH: influence of isosaccharinic and fulvic acidManuscript (preprint) (Other academic)
  • 38.
    Dario, Mårten
    et al.
    Örebro University, Department of Natural Sciences.
    Molera, Mireia
    Allard, Bert
    Örebro University, Department of Natural Sciences.
    Sorption of europium on TiO2 and cement at high pH in the presence of organic ligands2006In: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780, Vol. 270, no 3, p. 495-505Article in journal (Refereed)
    Abstract [en]

    Organic substances present in radioactive waste lower the sorption of metal ions at the high pH in cement matrices and, hence, enhance their possible migration. The aim of this study was to develop a method to compare organic substances or their degradation products with respect to what extent they affect metal sorption. Batch sorption studies were performed with cement or TiO2 as solid phase and Eu(III) as a model element for trivalent lanthanides and actinides at pH 12.5 (representative of a cement waste matrix during the first approximately 100,000 years). Different kinds of ligands were studied in a broad concentration range, e.g., organic acids, cement additives, cleaning agents and degradation products from ion-exchange resin.

  • 39.
    Duro, Lara
    et al.
    Amphos 21 Consulting S.L., Barcelona, Spain.
    Grivé, Mireia
    Amphos 21 Consulting S.L., Barcelona, Spain.
    Gaona, Xavier
    Amphos 21 Consulting S.L., Barcelona, Spain.
    Bruno, Jordi
    Amphos 21 Consulting S.L., Barcelona, Spain.
    Anderson, Thomas
    Linköping University, Linköping, Sweden.
    Borén, Hans
    Linköping University, Linköping, Sweden.
    Dario, Mårten
    Linköping University, Linköping, Sweden.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Hagberg, Jessika
    Örebro University, School of Science and Technology.
    Källström, Klas
    Svensk Kärnbränslehantering AB, Stockholm, Sweden.
    Study of the effect of the fibre mass UP2 degradation products on radionuclide mobilisation2012Report (Refereed)
  • 40.
    Elgh-Dalgren, Kristin
    et al.
    Örebro University, School of Science and Technology.
    Arwidsson, Zandra
    Sakab AB.
    Camdzija, Aida
    Sjöberg, Ragnar
    Ribé, Veronica
    Mälardalen University.
    Waara, Sylvia
    Mälardalen University.
    Allard, Bert
    Örebro University, School of Science and Technology.
    von Kronhelm, Thomas
    van Hees, Patrick A. W.
    Örebro University, School of Science and Technology.
    Laboratory and pilot scale soil washing of PAH and arsenic from a wood preservation site: Changes in concentration and toxicity2009In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 172, no 2-3, p. 1033-1040Article in journal (Refereed)
    Abstract [en]

    Soil washing of a soil with a mixture of both polycyclic aromatic hydrocarbons (PAH) and As was evaluated in laboratory and pilot scale, utilizing both single and mixtures of different additives. The highest level of decontamination was achieved with a combination of 0.213 M of the chelating agent MGDA and 3.2xCMC* of a nonionic, alkyl glucoside surfactant at pH 12 (Ca(OH)2). This combination managed to reach Swedish threshold values within 10 min of treat­ment when performed at elevated temperature (50°C), with initial conta­minant concentrations of As = 105±4 mg/kg and US-EPA PAH16 = 46.0±2.3 mg/kg. The main mechanisms behind the removal were the pH-effect for As and a combina­tion of SOM-ionization as a result of high pH and micellar solu­bilization for PAHs. Implementation of the laboratory results utilizing a pilot scale equipment did not improve the performance, which may be due to the shorter contact time between the washing solution and the particles, or changes in physical characte­ristics of the leaching solution due to the elevated pressure utilized. The ecotox­icological evaluation, Microtox®, demonstrated that all soil washing treatments increased the toxicity of soil leachates, possibly due to in­creased availability of contaminants and toxicity of soil washing solutions to the test organism.

  • 41.
    Elgh-Dalgren, Kristin
    et al.
    Örebro University, School of Science and Technology.
    Arwidsson, Zandra
    Örebro University, School of Science and Technology.
    Sjöberg, Ragnar
    Allard, Bert
    Örebro University, School of Science and Technology.
    von Kronhelm, Tomas
    van Hees, Patrick
    Örebro University, School of Science and Technology.
    Effect of chemical amendments on the distribution of arsenic and polycyclic aromatic hydrocarbons in a contaminated soil2009Conference paper (Refereed)
  • 42.
    Elgh-Dalgren, Kristin
    et al.
    Örebro University, School of Science and Technology.
    Düker, Anders
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    van Hees, Patrick
    Örebro University, School of Science and Technology.
    Simultaneous re­mediation of explosives and lead from contaminated soil by pH-adjust­mentManuscript (preprint) (Other academic)
    Abstract [en]

    Soil washing with pH-adjusted water was evaluated in two soils containing dif­ferent concentrations of heavy metals and explosives. Overall, the most efficient treatment was with water adjusted to pH 12 by NaOH. For explosives, pH 12 removed significantly higher amounts (P<0.05) of RDX and TNT compared to pH 4 (adjusted with HNO3) and distilled water in a moderately contaminated soil (230 mg HMX/kg, 1340 mg RDX/kg, 450 mg TNT/kg). In a more highly contaminated soil (6080 mg HMX/kg, 28740 mg RDX/kg, 3120 mg TNT/kg), the pH 12-treatment was the most efficient for removal of TNT and 2,4-DNT. Explosives removal increased with treatment time, probably due to the kineti­cally slow processes underlying the explosives degradation. Mobilization of heavy metals was strongly dependent on pH, with pH 12 mobilizing more than pH 3. In addition, the change in distribution coefficient (Kd) was more pro­nounced for local contaminants Pb and Cd in comparison with Cu and Zn, which were present in background concentrations.

  • 43.
    Fahlqvist, Linnea
    et al.
    Örebro University, School of Science and Technology. Bergskraft Bergslagen, Kopparberg, Sweden.
    Bäckström, Mattias
    Örebro University, School of Science and Technology.
    Sartz, Lotta
    Örebro University, School of Science and Technology. Bergskraft Bergslagen AB, Kopparberg, Sweden.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Removal of uranium from a neutral mine water using uncoated and iron oxyhydroxide coated iron tailings2013In: Reliable Mine Water Technology: Volume I. Proceedings of the International Mine Water Association Annual Conference 2013 / [ed] Brown, A.; Figueroa, L.; Wolkersdorfer, Ch., Colorado, USA: IMWA , 2013, p. 551-557Conference paper (Refereed)
    Download full text (pdf)
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  • 44.
    Grahn, Evastina
    et al.
    Örebro University, Department of Natural Sciences.
    Greis, Christina
    Örebro University, Department of Natural Sciences.
    Karlsson, Stefan
    Örebro University, Department of Natural Sciences.
    Düker, Anders
    Örebro University, Department of Natural Sciences.
    Allard, Bert
    Örebro University, Department of Natural Sciences.
    Pettersson, Håkan
    Failure of 137Cs and 239/240Pu dating of lake sediments: fallout from nuclear weapons testing and from the Chernobyl accident as well as redistribution processes?Manuscript (Other academic)
  • 45.
    Grahn, Evastina
    et al.
    Örebro University, Department of Natural Sciences.
    Greis, Christina
    Örebro University, Department of Natural Sciences.
    Karlsson, Stefan
    Düker, Anders
    Allard, Bert
    Örebro University, Department of Natural Sciences.
    Pettersson, Håkan
    Failure of 137Cs and 239,240Pu dating of lake sediments: fallout from nuclear weapons testing, the Chernobyl accident and redistribution processes?Manuscript (preprint) (Other academic)
  • 46. Grandin, Anna
    et al.
    Ogar, Anna
    Institute of Environmental Science, Jagiellonian University, Krakow, Poland.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Potential use of native fungal strains for assisted uranium retention2015In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 81, p. 173-178Article in journal (Refereed)
    Abstract [en]

    Uranium-stabilizing ligands can be useful complexing agents for uranium in aqueous solution. The discovery of novel ligand candidates for selective uranium capture in artificial and natural waters could provide scope for their use in water remediation and metal recovery from low- and high grade ores. In this study we used seven fungal strains, isolated from shale waste, to monitor the uranium retention capacity from an aqueous solution. After four weeks of incubation, suspensions containing the fungal strains were filtered, and up to 100% of the total uranium inventory was removed from a 10 mg L-1 solution. Approximately 70% of the total uranium removal is attributed to complexation and/or adsorption by particles in the malt extract and some 10% is adsorbed by the fungal biomass. The additional 20% uranium removed could be related to the excretion of fungal metabolites. From 58% to 90% of the uranium is removed within ten minutes. The formation of colloidal/particulate uranium is proposed to be controlled by organic ligands in the culture medium and organic ligands excreted by the fungi where phosphorus moieties seem to be important. Membrane fouling by the hydrocarbons is also suggested to contribute to a loss of uranium from the aqueous phase.

  • 47.
    Grawunder, A
    et al.
    Friedrich - Schiller - University, Jena, Germany.
    Meissner, S
    Friedrich - Schiller - University, Jena, Germany.
    Merten, D
    Friedrich - Schiller - University, Jena, Germany.
    Basilie, S
    Friedrich - Schiller - University, Jena, Germany.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Büchel, G
    Friedrich - Schiller - University, Jena, Germany.
    Origin of REE patterns in AMD-impacted areas2013In: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 77, p. 1210-1210Article in journal (Refereed)
  • 48.
    Grawunder, Anja
    et al.
    Friedrich Sciller Univ., Jena, Germany.
    Schäffner, Franziska
    Friedrich Sciller Univ., Jena, Germany.
    Merten, Dirk
    Friedrich Sciller Univ., Jena, Germany.
    Büchel, Georg
    Friedrich Sciller Univ., Jena, Germany.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Rare earth elements distribution and fractionation in a former acidic shale pit lake2011In: / [ed] E. Kothe, G. Büchel, 2011, p. 44-44Conference paper (Refereed)
  • 49.
    Greis, Christina
    et al.
    Örebro University, Department of Natural Sciences.
    Duker, Anders
    Man-Technology-Environment Research Centre, Örebro University, Örebro, Sweden.
    Allard, Bert
    Örebro University, Department of Natural Sciences.
    Roos, Per
    Department of Radiation Physics, Lund University Hospital, Lund, Sweden; Risø National Laboratory, Roskilde, Denmark.
    Holm, Elis
    Department of Radiation Physics, Lund University Hospital, Lund, Sweden; .
    Plutonium remobilization in a humic-rich lake2007In: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780, Vol. 277, no 1, p. 265-268Article in journal (Refereed)
    Abstract [en]

    Fresh water from Lake Svartsjön, Sweden, was collected and four fractions were prepared: (1) adsorption on DEAE, (2) flocculation with Ca2+, (3) co-precipitation with Fe hydrous oxide and (4) co-precipitation with Mn hydrous oxide. The plutonium level in the lake is 65 fg/l (222 μBq/l), measured by ICP-QMS and ICP-SFMS. Pronounced accumulation in fractions (1) (34%) and (2) (66%), combined with observed levels of organic matter indicate that plutonium is predominantly associated with organic matter. Measurements of isotopic ratios indicate that 77% of the plutonium originates from weapons testing and the remaining appears to originate from the Chernobyl accident.

  • 50.
    Greis, Christina
    et al.
    Örebro University, Department of Natural Sciences.
    Düker, Anders
    Pettersson, Håkan
    Karlsson, Stefan
    Allard, Bert
    Rapid method for ICP-MS analysis of plutonium in sediment samples2004Manuscript (preprint) (Other academic)
123 1 - 50 of 138
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