Abstract
A coprecipitation method with hafnium hydroxide was studied for the determination of chromium(III) and chromium(VI) in water by graphite-furnace atomic absorption spectrometry. Both 0.04-1.6 ug of chromium(III) and 0.04 -1.6 ug of chromium(VI) in a 200 cm3 water sample were quantitatively coprecipitated with hafnium hydroxide at pH 5.7; 0.04 -1.6 ug of chromium(III) alone was done at pH 11. Each of the precipitates obtained at pH 5.7 and 11 was dissolved in nitric acid; the solutions were then diluted to 10 cm3 and subjected to determinations of the total amount of chromium(III) and chromium(VI) and the amount of chromium(III) alone, respectively. The detection limits were 0.02 ng cm-3 of chromium(IH) and chromium(VI) in 200 cm3 of the initial sample solutions. The thirty four matrix ions tested did not produce any serious interference effects in the chromium(III) determination. Although the presence of fluoride, phosphate, and sulfate tended to reduce the recovery of chromium( VI), they could coexist up to amounts of 1 mg, 1 mg, and 50 mg, respectively.
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Ueda, J., Satoh, H. & Kagaya, S. Determination of Chromium(III) and Chromium(VI) by Graphite-Furnace Atomic Absorption Spectrometry after Coprecipitation with Hafnium Hydroxide. ANAL. SCI. 13, 613–617 (1997). https://doi.org/10.2116/analsci.13.613
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DOI: https://doi.org/10.2116/analsci.13.613