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Mobilization of heavy metals and arsenic in polluted wetland soils and its dependence on dissolved organic matter

Title data

Kalbitz, Karsten ; Wennrich, Rainer:
Mobilization of heavy metals and arsenic in polluted wetland soils and its dependence on dissolved organic matter.
In: Science of the Total Environment. Vol. 209 (1998) Issue 1 . - pp. 27-39.
ISSN 0048-9697
DOI: https://doi.org/10.1016/S0048-9697(97)00302-1

Abstract in another language

The wetland soils of the Mulde river in the industrial district of Bitterfeld-Wolfen (Germany) are highly contaminated with heavy metals and arsenic. We studied themobility of accumulated heavy metals and arsenic and the influence of dissolved organic matter (DOM) on element mobility. Undisturbed soil cores were taken fromfive different sites to represent a wide range of heavy-metal contamination, soil properties and dissolved organic carbon (DOG) concentrations. The acid-solubleconcentrations (mostly equal to the total content) were up to 1100 mg kg(-1) for Zn, 800 mg kg(-1) for Cr, 364 mg kg(-1) for Cu, 265 mg kg(-1) for As and 37 mgkg(-1) for Hg, depending on the sampling site. Percolation experiments using small lysimeters with undisturbed topsoil cores illustrated a considerable mobilization ofZn, Cd, Cu, Cr and Hg, depending on soil properties. Up to 80 mu g 1(-1) Cd, 8 mg 1(-1) Zn, 130 mu g 1(-1) Cr, 160 mu g 1(-1) Cu and 7 mu g 1(-1) Hg weredetected in the soil percolates. Arsenic mobilization was low. The concentration of Cr, Hg, Cu and As in the soil percolates was positively correlated with DOM.Besides the element content (mobile or acid-soluble), soil pH and soil characteristics describing the soil potential for heavy-metal adsorption (clay, oxides, cationexchange capacity), the DOC concentration in the soil solution should be known to access the potential mobilization of Hg, Cr, Cu and As. In contrast, Cd and Znmobilization depends on soil pH and mobile element content, but not on DOM. Additional studies on two soil profiles (down to 1.5 m) confirmed the translocation ofheavy metals from the highly contaminated topsoil into deeper soil horizons and into the groundwater and the influence of DOM as revealed with the percolationexperiment. Our results also showed that DOM is of minor importance on the mobilization of heavy metals in soils with a low soil pH (< 4.5).

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER9146
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 22 Oct 2015 07:29
Last Modified: 10 Mar 2016 08:33
URI: https://eref.uni-bayreuth.de/id/eprint/20701