Speciation of chromium in sea water |
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Authors: | F Ahern JM Eckert NC Payne KL Williams |
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Institution: | Department of Inorganic Chemistry, University of Sydney, Sydney, N.S.W. 2006 Australia;Department of Geology and Geophysics, University of Sydney, Sydney, N.S.W. 2006 Australia |
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Abstract: | Dissolved chromium(III) and (VI) are coprecipitated separately from sea water, and chromium in the precipitates and particulate matter is determined by thin-film x-ray fluorescence spectrometry. In combination with an ultraviolet irradiation procedure whch releases bound metals, the method provides information about the speciation of chromium in near-shore surface sea water. The ratios of labile Cr(III)/(IIO+VI) generally lie in a narrow range (0.4–0.5) as do the sums of labile Cr(III) and (VI) concentrations (0.3–0.6 μg l?1). Bound chromium is variable (0–3 μg l?1) and constitutes from 0 to 90% of total dissolved chromium. Acidification of the samples in the traditional manner for trace metal determination is shown to alter the proportion of Cr(III) to Cr(VI). |
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