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

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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. Bd. 209 (1998) Heft 1 . - S. 27-39.
ISSN 0048-9697
DOI: https://doi.org/10.1016/S0048-9697(97)00302-1

Abstract

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).

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER9146
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 22 Okt 2015 07:29
Letzte Änderung: 10 Mär 2016 08:33
URI: https://eref.uni-bayreuth.de/id/eprint/20701