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Metal leachability and anthropogenic signal in roadside soils estimated from sequential extraction and stable lead isotopes
Örebro University, Department of Natural Sciences.ORCID iD: 0000-0002-2674-4994
Örebro University, Department of Natural Sciences.
Örebro University, Department of Natural Sciences.ORCID iD: 0000-0002-2104-4593
2004 (English)In: Environmental Monitoring & Assessment, ISSN 0167-6369, E-ISSN 1573-2959, Vol. 90, no 1-3, p. 135-160Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
2004. Vol. 90, no 1-3, p. 135-160
National Category
Chemical Sciences
Research subject
Chemistry
Identifiers
URN: urn:nbn:se:oru:diva-5197DOI: 10.1023/B:EMAS.0000003572.40515.31OAI: oai:DiVA.org:oru-5197DiVA, id: diva2:158156
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
Keywords
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, StefanAllard, Bert

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