溶媒抽出-原子吸光法による微量アンチモンの定量

概要

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The extraction-atomic absorption procedure for the microanalysis of antimony was investigated. After the extraction using sodium dimethyldithiocarbamate (DMTC) as the chelating reagent, a Perkin-Elmer atomic absorption spectrophotometer(Model 403)(acetylene-air fiame by 10 cm slot burner) with an antimony hollow cathode lamp (Westinghouse Co.) was used for the measurement. The results were as follows; (1) Antimony ion reacted with DMTC and was extracted quantitatively into methyl isobutyl ketone(MIBK) from the aqueous solution at pH. 8.0〜9.4 by shaking it for about 5 minutes; the extracted complex in MIBK unchanged at least 48 hours at room temperature. (2) A calibration curve obtaincd was linear up to 2 μg-Sb/ml(MIBK), and the coefficient of variation in the determination of 2 μg-Sb/ml(MIBK) was 4.3% m 10 runs. The one percent absorbance of antimony was found to be 0.2 μg/ml(MIBK) . (3) The presence of 5 mg each of Cu(II), Zn(II), Mg(II), A1(III), Ni(II), CO_3^<2->, SO_4^<2->, PO_4^<3->, NO_3^-' and Cl^- did not interfere with the determination. On the other hand, Fe(III), Cr(III), Cr(VI). Mn(II), and Pb(II) interfered, but EDTA for Cr(III), Mn(II), Pb(II), CyDTA for Fe(III), and APDC for Cr(VI) are effective as the masking reagents, respectively.
社団法人日本分析化学会の論文
1977-10-05