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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 11, Number 4
JKCSEZ 11(4)
August 20, 1967 

 
Title
Study on Anomalous Polarographic Behavior of Cd (Ⅱ) in Tartrate Solution

타르타르산염지지용액에서의 Cd (Ⅱ) 폴라로그람의 이상파에 관한 연구
Author
Kwang Ho Koh

고광호
Keywords
Abstract
pH 6.0~12.6 범위에서 0.15M 타르타르산염지지용액 속에서의 Cd(II)플라로그람을 20℃ 및 25℃에서 조사한 결과 pH 7.8 부분까지는 한계전류값 및 반파전위값이 일정하지만 같은 이온강도의 질산염지지용액을 사용하였을 때에 비하여 반파전위값이 0.05 volt 부쪽으로 이행하고 있으며 한계전류값은 28% 감소되었다. pH 8.2 부분이상부터는 한계전류값이 급격하게 감소하다가 pH11.2~11.4 부근 이상부터 다시 급격히 증가하는 현상을 보여 주었다. 한편 pH 8.2 부분이상부터는 반파전위값은 pH증가에 따라 계속 부 쪽으로 이행하여 pH 12.6에서는 -0.78volt로 되었다. 가능한 전극반응기구를 가정하고 pH 9.4에 이르기 까지의 환원파변동의 원인을 검토하였다.

The polarograms of Cd(Ⅱ) in 0.15M tartrate solution were investigated in the range of pH values from 6.0 to 12.6 at 20°and 25℃. Up to pH value of 7.8, the limiting current and the halfwave potential were found to be constant, and when compared with the nitrate solution of the same Cd++ concentration at the same ionic strength, the limiting current decreased by 28% and the halfwave potential shifted by -0.05 volt. The values of limiting current sharply decreased as the pH value exceeded 8.2 and the minimum values appeared at the pH values of 11.2~11.4. The values of halfwave potential gradually decreased as the pH value increased over 8.2 and the value of -0.78 volt was obtained at the pH value of 12.6. Possible mechanisms of electrode reaction were suggested and the anomalous behavior of reduction waves of Cd(Ⅱ) in tartrate solution up to pH value of 9.4 was discussed.

Page
179 - 184
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