Introduction to A. C. Polarography

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The a. c. polarographic method of analysis established by B. Breyer is very widely employed especially in Japan. The present article describes its history, instrumentation, method of experiment and several applications. The instrument which appears in Japanese market is constructed according to the circuitry by Takahashi and Niki shown in Fig. 2. It is emphasized that in the application of the a.c, polarography one should take into account of the reversibility of the electrode process concerned. The periodical concentration polarization was schematically llustrated in Fig. 5. The mechnism by which the polarographic reduction of dissolved oxygen to hydrogen peroxide proceeds reversibly in alkaline media and irreversibly in acidic solution was cleared up according to the theory proposed by Bagotskii and Yablokova. The a.c. polarography also offers us a very simple and rapid method of easuring the differential capacity of electrode resulting in the automatic registration of the ten sammetric wave named by Breyer. The reason for this non-faradaic wave is explained as the competitive adsorption-desorption process of the indifferent cations and anions and the surface-active molecules, as shown in Figures 6 and 7. Some advantage of a.c. polarography such as the high sensitivity, high resolution power and others is summarized as well as some important caution that must be paid in, the analytical application
日本ポーラログラフ学会の論文