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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:||Makris, Konstantinos C.
Parsons, Jason G.
Datta, Rupali K.
Gardea-Torresdey, Jorge Luis
|Major Field of Science:||Natural Sciences||Field Category:||Earth and Related Environmental Sciences||Keywords:||Residuals;Drinking-water;Arsenic (As);XANES;EXAFS||Issue Date:||15-Nov-2009||Source:||Journal of Hazardous Materials, 2009, vol. 171, no. 1-3, pp. 980-986||Volume:||171||Issue:||1-3||Start page:||980||End page:||986||Journal:||Journal of Hazardous Materials||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.||URI:||http://ktisis.cut.ac.cy/handle/10488/4232||ISSN:||0304-3894||DOI:||10.1016/j.jhazmat.2009.06.102||Rights:||© Elsevier||Type:||Article||Affiliation :||Cyprus International Institute for Environmental & Public Health
Montclair State University
University of Texas
Michigan Technological University
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