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Arsenic speciation in the dispersible colloidal fraction of soils from a mine-impacted creek

AuthorsSerrano, Susana; Gómez-González, Miguel A.; O'Day, Peggy; Laborda, Francisco; Bolea, Eduardo; Garrido, Fernando
Issue Date9-Apr-2015
CitationJournal of Hazardous Materials 286: 30-40 (2015)
AbstractArsenic and iron speciation in the dispersible colloid fraction (DCF; 10–1000 nm) from an As-rich minewaste pile, sediments of a streambed that collects runoff from waste pile, the streambed subsoil, andthe sediments of a downstream pond were investigated by combining asymmetrical-flow field-flowfractionation (AsFlFFF)/inductively-coupled plasma–mass spectrometry (ICP–MS), transmission electronmicroscopy (TEM) and X-ray absorption (XAS) spectroscopy. Calcium, Fe and As (Fe/As molar ratio ∼ 1)were the main components of the DCF from waste pile. TEM/EDS and As and Fe XAS analysis revealed thepresence of nanoparticle scorodite in this same DCF, as well as Fe nanoparticles in all samples downstreamof the waste pile. Arsenic and Fe XAS showed As(V) adsorbed onto nanoparticulate ferrihydrite in the DCFof downstream samples. Micro-X-ray fluorescence indicated a strong correlation between Fe and As inphyllosilicate/Fe3+(oxi) hydroxide aggregates from the sediment pond. Fractionation analysis showed themean particle size of the DCF from the streambed sample to be smaller than that of the streambed subsoiland sediment ponds samples. These results show that an important and variable fraction of As may bebound to dispersible colloids that can be released from contaminated soils and transported downstreamin natural systems.
DescriptionReceived 3 July 2014, Received in revised form 21 November 2014, Accepted 15 December 2014
Publisher version (URL)http://dx.doi.org/10.1016/j.jhazmat.2014.12.025
Appears in Collections:(MNCN) Artículos
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