高分子量アミン抽出によるめっき排水中のクロム(VI)の原子吸光分析法

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The solvent extraction method is used for separating Cr(III) and Cr(VI), which are determined by means of atomic absorption spectrophotometry. In this paper, the use of high molecular amines-xylene solutions was investigated for extracting Cr(VI). Cr(VI) was extracted with HCl-acidified 1% Amberlite LA-1-xylene solution. After separating the organic phase, Cr(VI) in the phase was determined by atomic absorption spectrophotometry at 3579 Å in air-C<SUB>2</SUB>H<SUB>2</SUB> flame. The calibration curve is linear for less than 100 μg of Cr(VI). Cr(III), Zn, Cu, Fe(III), Ni, and Mn(II) do not affect the determination in their amount of less than 1000 μg. Pb interferes with it in the amount of 10 μg. The standard deviation of absorbances, which was measured 5 times, was 0.005 with the waste water from plating.
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