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KMID : 1059519840280050315
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Journal of the Korean Chemical Society
1984 Volume.28 No. 5 p.315 ~ p.322
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Effect of High Pressure on Polarographic Parameters of Metal Ions
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Lee Heung-Lark
Bae Zun-Ung
Yun Jong-Hoon
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Abstract
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The dependence of polarographic parameters on the pressure for the reduction of In(Ⅲ), Cr(Ⅲ), Cd(Ⅱ), Pb(Ⅱ), Mn(Ⅱ), Co(Ⅱ), Tl(Ⅰ) in 0.1M KCl aqueous solution at the dropping mercury electrode have been discussed. In this experiment the temperature varied from 25℃ to 35℃ and the pressure ranges from 1 atmosphere to 1,800 atmospheres. By increasing the pressure the reduction half-wave potentials of all metal ions are shifted markedly to more negative values and the diffusion currents of all metal ions become considerably larger. The slope of the linear relationship of E vs. log[(id-i)/i] become much larger with increase in pressure, which indicates more irreversible reduction. The temperature coefficient observed over the range of the temperature from 25℃ to 35℃ are not sensitive with increase in pressure.
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