Syntheses of β-mercaptoacrylic acid and β-mercaptocrotonic acid and application of their thiuronium salts as reagent for spectrophotometric determination of nickel and cobalt

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Other Title
  • β-メルカプトアクリル酸, β-メルカプトクロトン酸の合成とそのチウロニウム塩のニッケル, コバルトの比色定量試薬としての応用
  • ベータ-メルカプトアクリルサン , ベータ-メルカプトクロトンサン ノ ゴウセイ ト ソノ チウロニウムエン ノ ニッケル , コバルト ノ ヒショク テイリョウ シヤク ト シテ ノ オウヨウ
  • Studies on the sulfur-containing chelating agents. XVII
  • イオウを含むキレート試薬に関する研究 (第17報)

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Description

β-Mercaptoacrylic acid and β-mercaptocrotonic acid were synthesized through thiuronium salt obtained by addition of thiourea to propiolic acid or tetrolic acid. Although both compounds exhibit sensitive color with various metal ions, they are not suitable as practical reagents on account of their instability in air and pungent odor. Instead of using these mercapto acids, the applicabilities of their thiuronium salts as the analytical reagents were investigated. The thiuronium salts were found to be readily hydrolyzed by alkali to produce quantitatively the mercapto acids. Simultaneous determination of nickel and cobalt ions using the thiuronium salts were possible by the measurement of the absorbances at the wavelength of absorption maximum of each complex, namely, 505 mμ for nickel and 640 mμ for cobalt. The compositions of nickel and cobalt complexes were 1 : 2 and 1 : 3 in molar ratio of metal to reagent, respectively. Thiuronium salt is very stable, prepared easily, and can be used conveniently as the analytical reagent.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 17 (2), 134-138, 1968

    The Japan Society for Analytical Chemistry

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