Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Polarographic Behavior of Cadmium-Tartrate Complexes in Weak Acid and Alkaline Media

  • Lee, Kyung-Ae (Instrumental Analysis Research Division, Korea Institute of Energy & Resources) ;
  • Choi, Q.-Won (Department of Chemistry, Seoul National University) ;
  • Ha, Young-Gu (Department of Chemistry, Seoul National University) ;
  • Choy, Jin-Ho (Department of Chemistry, Seoul National University) ;
  • Kim, Ha-Suck (Department of Chemistry, Seoul National University)
  • Published : 1989.10.20
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Abstract

The electrochemical behavior of cadmium(Ⅱ) in tartrate solution has been studied over the pH range of 6 to 13.6 in order to explain the phenomena of the changes in limiting current depending on the pH. The polarographic limiting current showed a constant value up to pH of 7.8, after which it decreased sharply to show a minimum at pH between 11 and 12. The limiting current, then, increased again with increasing pH. The number of peaks in cyclic voltammogram was 1 to 3 depending on the pH of the solution. Two other voltammetric peaks could be observed when the main reduction peak diminished. The decrease of limiting current at 7.5$Cd(C_4H_3O_6)^-$. The increase of limiting current at strong alkaline solution, however, was due to the complex $Cd(Tart)_2(OH)_2^{4-}$.

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