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Título

Colloidal mobilization of arsenic from mining-affected soils by surface runoff

Autor Gómez-González, Miguel A.; Voegelin, Andreas; García-Guinea, Javier ; Bolea, Eduardo; Laborda, Francisco; Garrido, Fernando
Palabras clave AF4-ICP-MS
Arsenic
Colloids
Rainfall simulation
Runoff
XAS
Fecha de publicación 23-oct-2015
EditorElsevier
Citación Chemosphere 144: 1123-1131 (2016)
ResumenScorodite-rich wastes left as a legacy of mining and smelting operations pose a threat to environmental health. Colloids formed by the weathering of processing wastes may control the release of arsenic (As) into surface waters. At a former mine site in Madrid (Spain), we investigated the mobilization of colloidal As by surface runoff from weathered processing wastes and from sediments in the bed of a draining creek and a downstream sedimentation-pond. Colloids mobilized by surface runoff during simulated rain events were characterized for their composition, structure and mode of As uptake using asymmetric flow field-flow fractionation coupled to inductively plasma mass spectrometry (AF4-ICP-MS) and X-ray absorption spectroscopy (XAS) at the As and Fe K-edges. Colloidal scorodite mobilized in surface runoff from the waste pile is acting as a mobile As carrier. In surface runoff from the river bed and the sedimentation pond, ferrihydrite was identified as the dominant As-bearing colloidal phase. The results from this study suggest that mobilization of As-bearing colloids by surface runoff may play an important role in the dispersion of As from metallurgical wastes deposited above ground and needs to be considered in risk assessment.
Descripción Received 2 June 2015, Revised 2 September 2015, Accepted 24 September 2015, Available online 23 October 2015
Versión del editorhttp://dx.doi.org/10.1016/j.chemosphere.2015.09.090
URI http://hdl.handle.net/10261/123963
DOI10.1016/j.chemosphere.2015.09.090
ISSN0045-6535
E-ISSN1879-1298
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