β-メルカプトヒドロ桂皮酸,β-メルカプト桂皮酸のニッケル,コバルトの比色定量試薬としての応用

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The complex formations of β-mercaptohydrocinnamic acid and β-mercaptocinnamic acid with nickel and cobalt ions were studied, and their applicabilities as new reagents for the spectrophotometric determination of nickel and cobalt ions were investigated.<BR>β-Mercaptohydrocinnamic acid formed Water-soluble complexes with nickel and cobalt ions in alkaline medium. The absorption maxima were observed at 520 mμ in the nickel complex and 560 mμ in the cobalt complex. The applicability of Beer's law was confirmed at the wavelengths of the absorption maxima of the complexes when the concentration of the metal ion was less than 100 ppm. β-Mercaptocinnamic acid formed also water-soluble complexes with nickel and cobalt ions in alkaline medium. The absorption maxima were observed at 495 mμ in the nickel complex and 635 mμ in the cobalt complex. Simultaneous determination of nickel and cobalt ions in their mixture was possible by the measurement of the absorbance at 495 mμ and 635 mμ. The molar ratios of the metal ions to the ligand in solution were found to be 1 : 2 and 1 : 3 in the nickel complex and cobalt complex, respectively, by mole ratio method and continuous variation method. As these reagents were very stable, they were considered to be useful as the analytical reagents.
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