Arsenic Species Formed from Arsenopyrite Weathering along a Contamination Gradient in Circumneutral River Floodplain Soils

Arsenic is a toxic trace element, which commonly occurs as contaminant in riverine floodplains and associated wetlands affected by mining and ore processing. In this study, we investigated the solid-phase speciation of As in river floodplain soils characterized by circumneutral pH (5.7–7.1) and As c...

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Veröffentlicht in:	Environ. Sci. Technol 2014-01, Vol.48 (1), p.208-217
Hauptverfasser:	Mandaliev, Petar N, Mikutta, Christian, Barmettler, Kurt, Kotsev, Tsvetan, Kretzschmar, Ruben
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Arsenic Arsenic - analysis Arsenic - chemistry Arsenicals - chemistry Biological and physicochemical properties of pollutants. Interaction in the soil Bulgaria Data collection Diffraction Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Exact sciences and technology Extraction processes Ferric Compounds - chemistry Floodplains Fluorescence Freshwater Iron - analysis Iron - chemistry Iron Compounds - chemistry Minerals - chemistry Mining Particle Size Pollution Pollution, environment geology Rivers Soil - chemistry Soil and sediments pollution Soil contamination Soil Pollutants - analysis Soil Pollutants - chemistry Spatial Analysis Spectrometry, X-Ray Emission Sulfides - chemistry X-Ray Absorption Spectroscopy X-Ray Diffraction
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Zusammenfassung:	Arsenic is a toxic trace element, which commonly occurs as contaminant in riverine floodplains and associated wetlands affected by mining and ore processing. In this study, we investigated the solid-phase speciation of As in river floodplain soils characterized by circumneutral pH (5.7–7.1) and As concentrations of up to 40.3 g/kg caused by former mining of arsenopyrite-rich ores. Soil samples collected in the floodplain of Ogosta River (Bulgaria) were size-fractionated and subsequently analyzed using a combination of X-ray fluorescence (XRF) spectrometry, powder X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and selective chemical extraction of poorly crystalline mineral phases. Arsenic and Fe were found to be spatially correlated and both elements were strongly enriched in the fine soil particle size fractions (
ISSN:	0013-936X 1520-5851
DOI:	10.1021/es403210y