Abstract
Field studies in a shallow estuary have revealed daytime decreases in the dissolved Cr(VI)/Cr(III) ratio that correlate temporally with increases in the H 2 O 2 concentration. Photolyzing water samples from the field site in silica flasks produces Cr(VI) loss and Cr(III) gain in essentially equimolar amounts. Reduction occurs neither in dark controls nor in prefiltered samples, indicating that both light and particles are essential. Field and laboratory results are consistent with reduction initiated by Fe(II), which has been generated photolytically from particulate ferric oryhydrorides plus organic matter
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