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Groundwater derived arsenic in high carbonate wetland soils: Sources, sinks, and mobility

Titelangaben

Bauer, Markus ; Fulda, Beate ; Blodau, Christian:
Groundwater derived arsenic in high carbonate wetland soils: Sources, sinks, and mobility.
In: Science of the Total Environment. Bd. 401 (2008) Heft 1-3 . - S. 109-120.
ISSN 0048-9697
DOI: https://doi.org/10.1016/j.scitotenv.2008.03.030

Abstract

Wetlands and organic soils have been recognized as important sinks for arsenic in the environment, yet sources and immobilization mechanisms of As are often unclear. To begin rectifying this deficiency, we investigated As retention and binding mechanisms at a degraded, minerotrophic wetland site in contact with groundwater rich in As and Fe. Arsenic occurred in high dissolved concentrations of up to 467 μg L− 1 in the groundwater, but dropped to values below 10 μg L− 1 towards the surface. The solid phase As content instead was high in the topsoil with up to 3400 mg kg− 1 and decreased with depth to 15 mg kg− 1. A similar pattern was observed with respect to Fe. Amorphous and crystalline iron precipitates were the main sorbents for arsenic in the soil horizons according to results from wet chemical sequential extractions. Arsenic was apparently not associated with inorganic carbon phases, but a substantial portion of up to 31% of Astot could be mobilized by dispersion of soil organic matter. Ratios of dissolved As(III)/As(V) decreased from the deeper As(III) dominated groundwater to the As(V) dominated soil porewaters, where As was apparently immobilized in its oxidized form. Concentrations of the organic species DMA and MMA were negligible. According to the results of simple one-dimensional estimates the vertical arsenic transport from the source in the groundwater to the topsoil was slow given an extrapolation of current conditions. These results suggest that As accumulation started before the beginning of drainage in the now degraded peatland soils and the degradation and mass loss of organic matter under oxic conditions caused the very high As concentrations found in the topsoil horizon today.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER61937
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Hydrologie
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Forschungseinrichtungen > Forschungsstellen > Limnologische Forschungsstation
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungsstellen
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 15 Mai 2015 14:47
Letzte Änderung: 22 Mär 2022 12:58
URI: https://eref.uni-bayreuth.de/id/eprint/13721