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Mobilisation of heavy metals by deicing salts in a roadside environment
Örebro University, Department of Natural Sciences.ORCID iD: 0000-0002-2674-4994
Örebro University, Department of Natural Sciences.
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2004 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 38, no 3, p. 720-732Article in journal (Refereed) Published
Abstract [en]

The seasonal variations of some selected heavy metals (Cd, Cu, Pb and Zn) and principal anions in soil solutions were monitored as a function of distance from the road at two field sites in Sweden. During the winter, the conductivity, concentrations of dissolved sodium and chloride increased dramatically due to the application of deicing agents (i.e. NaCl). Due to ion exchange, the pH decreased one unit in the soil solutions, whereas the concentrations of total organic carbon decreased due to coagulation and/or sorption to stationary solids. The heavy metal concentrations increased during the winter, but through different mechanisms. Cadmium concentrations in the aqueous phase increased as a response to ion exchange, possibly also enhanced by the formation of chloride complexes. Similarly, the concentrations of zinc increased, due to ion exchange, with calcium and protons. The mechanisms of mobilisation for copper and lead were not that clear probably due to association with coagulated or sorbed organic matter in combination with colloid dispersion

Place, publisher, year, edition, pages
2004. Vol. 38, no 3, p. 720-732
National Category
Natural Sciences
Research subject
Enviromental Science
Identifiers
URN: urn:nbn:se:oru:diva-5200DOI: 10.1016/j.watres.2003.11.006OAI: oai:DiVA.org:oru-5200DiVA, id: diva2:158162
Available from: 2009-01-30 Created: 2009-01-30 Last updated: 2017-12-14Bibliographically approved
In thesis
1. On the chemical state and mobility of lead and other trace elements at the biogeosphere/technosphere interface
Open this publication in new window or tab >>On the chemical state and mobility of lead and other trace elements at the biogeosphere/technosphere interface
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Most inorganic contamination has occurred at the interface between the technosphere and the biogeosphere, even though atmospheric emissions have affected the entire globe. Several human activities now pose a substantial threat towards human health and the ecosystems. It was thus decided to study lead as an element with significant anthropogenic emissions in a variety of sources and environments. Lead and other trace elements were studied in groundwaters used for drinking water, in roadside environments, at a shooting range and in a contaminated lake in order to obtain information about mobility and redistribution in different hydrobiogeochemical environments.

It was found that 60% of the investigated drilled wells in crystalline bedrock failed to meet international health safety limits. This was mainly due to the presence of enhanced concentrations of fluoride and uranium.

Along roads the concentrations and massfluxes increased significantly for lead, as well as for otheer elements during the winter. This is most likely due to increased pavement wear as a consequence of studded tires and use of deicing salts. The mobility of trace elements also increased in the roadside soils, threatening the shallow groundwater.

At the shooting range it was found that the downward migration of lead was greater than expected and equilibrium with cerussite was suggested from solid speciation and geochemical calculations. Antimony was associated with lead and showed, despite differences in chemical properties, a similar distribution pattern. This was due to the fact that the major part of the transport at the shooting range was physical.

In the contaminated lake, several findings regarding the solid speciation of lead was confirmed and other information about redistribution into the hypolimnion from the sediment was gained.

Place, publisher, year, edition, pages
Örebro: Örebro universitetsbibliotek, 2002. p. 42
Series
Örebro Studies in Chemistry, ISSN 1651-4270 ; 1
Keyword
lead, trace elements, traffic, shooting range, peat, sediments, speciation, biokemi
National Category
Chemical Sciences
Research subject
Chemistry
Identifiers
urn:nbn:se:oru:diva-9 (URN)91-7668-313-3 (ISBN)
Public defence
2002-10-18, Hörsal P, Örebro universitet, Fakultetsgatan 1, Örebro, 10:15
Opponent
Available from: 2002-10-18 Created: 2002-10-18 Last updated: 2017-10-18Bibliographically approved

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Bäckström, MattiasKarlsson, Stefan

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