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Title: X-ray absorption spectroscopy as a tool investigating arsenic(III) and arsenic(V) sorption by an aluminum-based drinking-water treatment residual
Authors: Sarkar, Dibyendu 
Parsons, Jason G. 
Datta, Rupali K. 
Gardea-Torresdey, Jorge Luis 
Makris, Konstantinos C. 
Keywords: Residuals;Drinking-water;Arsenic (As);XANES;EXAFS
Category: Earth and Related Environmental Sciences
Field: Natural Sciences
Issue Date: 15-Nov-2009
Publisher: Elsevier B.V.
Source: Journal of Hazardous Materials, 2009, Volume 171, Issue 1-3, Pages 980-986
Abstract: Historic applications of arsenical pesticides to agricultural land have resulted in accumulation of residual arsenic (As) in such soils. In situ immobilization represents a cost-effective and least ecological disrupting treatment technology for soil As. Earlier work in our laboratory showed that drinking-water treatment residuals (WTRs), a low-cost, waste by-product of the drinking-water treatment process exhibit a high affinity for As. Wet chemical experiments (sorption kinetics and desorption) were coupled with X-ray absorption spectroscopy measurements to elucidate the bonding strength and type of As(V) and As(III) sorption by an aluminum-based WTR. A fast (1 h), followed by a slower sorption stage resulted in As(V) and As(III) sorption capacities of 96% and 77%, respectively. Arsenic desorption with a 5 mM oxalate from the WTR was minimal, being always <4%. X-ray absorption spectroscopy data showed inner-sphere complexation between As and surface hydroxyls. Reaction time (up to 48 h) had no effect on the initial As oxidation state for sorbed As(V) and As(III). A combination of inner-sphere bonding types occurred between As and Al on the WTR surface because mixed surface geometries and interatomic distances were observed.
ISSN: 0304-3894
Rights: © Elsevier B.V.
Type: Article
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