Research Watch: Microtox limitations

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Redox processes in contaminated groundwater Understanding the distribution of oxidation-reduction (redox) processes is critical for predicting the fate and transport of chemical contaminants in groundwater aquifers. F. H. Chapelle and co-workers measured the oxidation-reduction potential (Eh) and concentrations of dissolved hydrogen in an aquifer contaminated with solvents and jet fuels. Measurements of Eh across the contaminated plume identified oxic versus anoxic groundwater The main redox process was attributable to iron reduction Methanogenesis and sulfate reduction were not identified via Eh measurements Dissolupri hydrnnen concentration anal-

yses however inriicatpri the presence of methanogenesis in contaminatorl sediments near

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anoxic redox processes than Eh measurements, (Fnviron