Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/1760
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Type: Journal article
Title: Coupling speciation and isotope dilution techniques to study arsenic mobilization in the environment
Author: Hamon, R.
Lombi, E.
Fortunati, P.
Nolan, A.
McLaughlin, M.
Citation: Environmental Science & Technology, 2004; 38(6):1794-1798
Publisher: Amer Chemical Soc
Issue Date: 2004
ISSN: 0013-936X
1520-5851
Statement of
Responsibility: 
Rebecca E. Hamon, Enzo Lombi, Paolo Fortunati, Annette L. Nolan, and Mike J. McLaughlin
Abstract: We have developed an approach to isolate mechanisms controlling mobility and speciation of As in soil-water systems. The approach uses a combination of isotopic exchange and chromatographic/mass spectrometric As speciation techniques. We used this approach to identify mechanisms responsible for changes in the concentration of soluble As in two contaminated soils (Eaglehawk and Tavistock) subjected to different redox conditions and microbial activity. A high proportion of the total As in both soils was present in a nonlabile form. Incubation of the soils under anaerobic conditions led to changes in the concentration of soluble As in each soil but did not change the As speciation or the proportion of total As in labile forms in the soils. Hence, a decrease in soluble As in the Eaglehawk soil was the result of an Eh-induced pH decrease, enhancing the solid-phase sorption of As(V). An increase in soluble As in the Tavistock soil was due to an Eh-induced pH increase, decreasing solid-phase sorption of As(V). Incubation of the soils under aerobic conditions with microbial activity stimulated by addition of glucose resulted in no change in the solution concentration or speciation of As in the Eaglehawk soil, but led to a large increase in the concentration of soluble As in the Tavistock soil. This increase was due to conversion of exchangeable forms of As(V) into less strongly sorbed As(III) species. Incubation under anaerobic conditions in the presence of glucose resulted in a large increase in the concentration of soluble As in both soils; however, different mechanisms were found to be responsible for the increase in each soil. In the Eaglehawk soil higher concentrations of As were again due to conversion of exchangeable forms of As(V) into less strongly sorbed As(III) species. In contrast in the Tavistock soil, the increased As in solution was the result of release of As(V) from the large reservoir of nonlabile soil As.
Keywords: Arsenic; Glucose; Soil Pollutants; Water Pollutants; Soil Microbiology; Environmental Monitoring; Solubility; Mass Spectrometry
Description: Copyright © 2004 American Chemical Society
RMID: 0020040247
DOI: 10.1021/es034931x
Published version: http://pubs.acs.org/cgi-bin/abstract.cgi/esthag/2004/38/i06/abs/es034931x.html
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute publications

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