The extraction-spectrophotometric determination of lead with bismuthiol II.

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概要

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• The solvent extraction-spectrophotometric determination of lead(II) with bismuthiol II was conducted in the presence of 1,10-phenanthroline(phen). Lead(II) was quantitatively extracted as ternary complexes into the chloroform phase over the pH range of 3.0–7.0. The composition of the extracted ternary complexes were confirmed to be Pb: bismuthiol II: phen= 1 : 2 : 2 or 1 : 2 : 1, depending on the concentration of bismuthiol II added to the aqueous solution. The absorption maximum of the ternary complex (1 : 2 : 2) in chloroform was found to be at 342 nm, with a molar extinction coefficient of 3.5×10<SUP>4</SUP> dm<SUP>3</SUP> mol<SUP>−1</SUP> cm<SUP>−1</SUP>. Under optimum conditions, the absorbance follows Beer's law up to 300 μg of lead in 10 ml of chloroform. The coefficient of the variation was 1.3% for 30 μg of lead. Many elements interfered with the determination of lead(II). However, the interfering ions, with the exception of the indium and bismuth ions, were masked with a potassium cyanide solution. The proposed method was then applied to the determination of lead in standard zinc metals. A good agreement was observed between the results obtained by the proposed method and the standard values of the samples.

• 公益社団法人 日本化学会の論文

著者

• Watanabe Kunihiro

  Faculty Of Science And Technology Science University Of Tokyo

• Imaeda Yoshitaka

  Faculty of Science and Technology, Science University of Tokyo

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• The extraction-spectrophotometric determination of lead with bismuthiol II.

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