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Chemical Modeling of Acid WatersHexavalent chromium in ground water, Mojave Desert, CA This study of chromium in the ground water of the Mojave Desert, California is a collaborative investigation with the San Diego District of the U.S. Geological Survey. The objectives are to determine current baseline concentrations of total and hexavalent chromium in ground water over an extensive area of the Mojave Desert, identify the hydrologic pathways, determine the geologic and hydrologic controls of the groundwater chemistry, and identify the processes controlling the variability of dissolved chromium concentrations. To this end, a monitoring program is underway to identify spatial and temporal trends in ground water Cr concentrations. To distinguish between natural and anthropogenic sources of chromium, research is being conducted into measuring differences in Cr stable isotope ratios.
Publications: Izbicki, J.A., Ball, J.W., Bullen, T.D., and Sutley, S.J., 2008, Chromium, chromium isotopes and selected trace elements, western Mojave Desert, USA: Applied Geochemistry, v. 23, no. 5, p. 1325-1352. A New Cation-Exchange Method for Accurate Field Speciation of Hexavalent Chromium, Water-Resources Investigations Report 03-4018 A New Cation-Exchange Method for Field Speciation of Hexavalent Chromium, U.S. Geological Survey Fact Sheet-006-03 Ball, J.W., and Izbicki, J.A., 2004, Occurrence of hexavalent chromium in ground water in the western part of the Mojave Desert, California: Applied Geochemistry, v. 19, no. 7, p. 1123-1135. (on-line abstract)
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