GEOC 3 |
| Rebecca E. Hamon1, Enzo Lombi1, Paolo Fortunati2, Annette Nolan1, and Mike J. McLaughlin1. (1) Environmental Chemistry, CSIRO Land & Water, PMB 2, Glen Osmond, Australia, (2) Faculty of Agricultural Sciences, Università Cattolica del Sacro Cuore, Via Emilia Parmense 84, Piacenza, Italy |
| The mobility and toxicity of arsenic (As) in water and soil systems is controlled by a complex array of biotic/abiotic sorption, precipitation and redox processes which dictate its solid-phase partitioning and speciation. Due to this complexity, the relative contribution of these processes in governing As mobility in any given system remains to be unequivocally resolved. An isotopic exchange technique in combination with a coupled chromatographic/mass spectroscopic As speciation method was developed to simultaneously determine the labile pools of arsenite and arsenate in soil-water systems. This method was applied to As contaminated soils which had been subjected to different pH, redox and microbial treatments and was successful in isolating a suite of environment- and soil-dependent mechanisms controlling the mobility and speciation of As. |
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Chemistry of Metals in Terrestrial and Aquatic Systems
8:00 AM-11:25 AM, Sunday, March 28, 2004 Marriott -- Marquis NE, Oral
Division of Geochemistry |