Abstract
In the analytical applications of the polarographic method, it is desirable to eliminate the effect of the double layer capacity. Assuming that the auxiliary electrode of the polarographic cell is not polarized and the resistance of solution is very small, it can be considered a simple electrical equivalent circuit for the cell. The equivalent circuit consists of a resistance Rx and capacitance Cx in parallel, and the conductivity 1/Rx is propotional to the concentration of bulk solution. Such being the considerations, a new A.C. bridge polarograph has been introduced in this paper. The conductivity 1/Rx was measured independently of the capacitance component Cx by a means of detecting 6he phase difference between a current ic flows through the capacitance component Cx and the superimposed AC. voltage. At the same time, the variations of the Cx was recorded automatically. The principle of the polarograph was discussed, and the electrical characteristics and a few of the actual applications are presented here.
