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SORPTION OF ARSENATE AND ARSENITE ON RUO2·XH2O: ANALYSIS OF SORBED PHASE OXIDATION STATE BY XANES
Citation:
Impellitteri**, C A., K G. Scheckel*, AND J A. Ryan*. SORPTION OF ARSENATE AND ARSENITE ON RUO2·XH2O: ANALYSIS OF SORBED PHASE OXIDATION STATE BY XANES. Argonne National Laboratory, Argonne, IL, 2003.
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Description:
Arsenic contamination in water, soil and sediment is a global problem. Awareness of the problems created by As contamination have increased in recent years due to reports from Asia describing immense health problems due to As in drinking water [1, 2]. Changes in the U.S. regulations for As maximum contaminant level (MCL) values in drinking water (from 50 µg/L to 10 µg/L) have also increased interest and research concerning As in the environment.
The research presented here was performed in conjunction with macroscopic studies on the sorption of arsenate and arsenite by RuO2·xH20 consisting of batch sorption experiments and kinetic experiments in a continuously stirred reactor. The use of X-ray absorption spectroscopic (XAS) techniques in this work confirmed results from the macroscopic-scale batch sorption and kinetic experiments. The objectives of the study were to examine the effects of pH on the sorption of arsenite and arsenate on RuO2·xH20, study the kinetics of sorption, and assess the solution and solid state As speciation associated with RuO2·xH20. This work provides fundamental data on the potential efficacy of RuO2·xH20 for use in remediation of As contaminated water, soils, sediments and mine wastes.
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SORPTION OF ARSENATE AND ARSENITE ON RUO2·XH2O: ANALYSIS OF SORBED PHASE OXIDATION STATE BY XANES