Effect of a Metal Plate in the Coil-type High Frequency Titrimeter
Masaichiro Masui · YAKUGAKU ZASSHI · 1954
In the type of a high frequency oscillator (Fig. 1), where a sample is inserted into the coil, it was found that the placement of a copper plate (designated as S-plate, shown as a long line in Fig. 2) at one end of the coil generally resulted in the increased sensitivity and disappearance of the maximum and minimum ordinarily observed on the concentration-current curve and was replaced by the curves shown in Fig. 3 (b, c, d, e) and Fig. 7 (the descending phenomenon of the curve that occurs at around 5-6 N is due to the fall of conductivity) (cycle, ca. 20 megacycles). When the size ratio of the coil, S-plate, and beaker is varied, the curve becomes such as shown in Fig. 7. This effect of the S-plate was explained theoretically by the use of a simplified equivalence circuit shown in Fig. 5, the relationship shown in Table I, and equations (1) and (2) given in the main text. The inverted phenomena of titration curves and impossibility of titration, was often observed by changing the concentration, were distinctly eliminated by the use of the S-plate (see Fig. 11).