クロノポテンショメトリーにおける電位-時間平方根曲線自記装置

概要

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As the concentration of depolarizer is related to the square root of transition time in chronopotentiometry, such a method has not commonly found application in analytical chemistry. However, if voltage change could be recorded against the square root of time, the curve (time-root potentiogram) would provide a means for quantitative analysis comparable to the case of the polarogram. A device for the time-root potentiometry was developed, consisting of two parts, one of which involves a voltage generator proportional to the square root of time and the other a constant current supplier. The signals of potential change and square root of time were first stored in a digital memory, and later read out slowly and recorded on an X-Y recorder. As the working electrode, a mercury pool electrode, a hanging mercury electrode, or a glassy carbon electrode was used, and as the counter electrode, a Ag/AgCl electrode. The time-root potentiograph was tested by a mixed solution of Cu^<2+> Cd^<2+>, Pb^<2+> and Zn^<2+>. The wave width of each metal in the time-root potentiogram was proportional to each concentration. Thus, the present method should find as wide an analytical application as polarography.
社団法人日本分析化学会の論文
1979-04-05