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

AuthorsGómez-González, Miguel A.; Voegelin, Andreas; García-Guinea, Javier ; Bolea, Eduardo; Laborda, Francisco; Garrido, Fernando
Rainfall simulation
Issue Date23-Oct-2015
CitationChemosphere 144: 1123-1131 (2016)
AbstractScorodite-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.
DescriptionReceived 2 June 2015, Revised 2 September 2015, Accepted 24 September 2015, Available online 23 October 2015
Publisher version (URL)http://dx.doi.org/10.1016/j.chemosphere.2015.09.090
Appears in Collections:(MNCN) Artículos
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