アンチモン-1-ピロリジンジチオカルバミン酸錯体を抽出試薬とする銅(II)の吸光光度定量

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タイトル別名
  • アンチモン‐１‐ピロリジンジチオカルバミン酸錯体を抽出試薬とする銅（ＩＩ）の吸光光度定量
  • Spectrophotometric determination of copper (II) with antimony 1-pyrrolidinecarbodithioate as an extracting reagent
  • アンチモン 1 ピロリジンジチオカルバミンサン サクタイ オ チュウシュツ シ

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抄録

Because of the great extractability of copper(II) 1-pyrrolidinecarbodithioate (Cu-pdtc), copper in aqueous phase was extracted completely with chloroform solution of antimony(III) 1-pyrrolidinecarbodithioate (Sb-pdtc). The chloroform solution of Sbpdtc was stable for 3 months in a dark bottle, but the solution in a clear bottle became cloudy on standing for half a day under diffused light. The effects of acidity, concentration of Sb-pdtc in chloroform and shaking time on the extractability of copper were examined. The recommended procedure for the determination of copper is as follows : Take an aliquot of sample solution (under 31.6μg Cu) into a 100 cm3 separating funnel. Add 5 cm3 of 0.5 mol dm-3 sulfuric acid solution, and make the volume of the solution to 50 cm3 with water. Shake for 15 min with 10.0 cm3 of 0.056% (w/v) Sb-pdtc chloroform solution. Measure the absorbance at 435 nm against reagent blank solution within 1h after extraction. A linear calibration curve was obtained for the range of (0.7931.6)μg Cu(II). In the conventional solvent-extraction-spectrophotometric method with pdtc as extracting reagent, the determination of copper is interfered by many metal ions such as cobalt(II), manganese(II), nickel(II), bismuth (III) and chromium (VI). In the proposed method, only bismuth(III) interfered. However, Bi-pdtc in organic phase was back-extracted with 20cm3 of 4 mol dm-3 NaOH solution by shaking for 15 min, therefore, the interference caused by bismuth may be removed by this technique. It was confirmed from the analyses of the standard samples that the proposed method was an excellent one for the determination of copper in steel.

収録刊行物

  • 分析化学

    分析化学 28 (5), 318-322, 1979

    公益社団法人 日本分析化学会

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