定電位電解法の研究 (第1報)
計数微量電量計及びその銅, 鉛, カドミウムの電量分析への応用
1955 年 75 巻 12 号 p. 1515-1519
詳細
1955 年 75 巻 12 号 p. 1515-1519
A simple, wide-rage millicoulometer, utilizing blocking oscillator, was made on trial. By utilizing the change in electric pressure by the current flowing through the resistance, Rg (Fig. 1), in the grid circuit, the resistance in the resistance circuit containing 65J7-GT tube was made to change automatically and the oscillating frequency was made proportional to the currency. The linearity was as shown in Fig. 3. Reproducibility was within 0.2%. Controlled potential coulometric titration of microgram amounts of copper, lead, and cadmium was carried out with this coulometer. If the background count is made definite and the ratio of that to the total count made as small as possible, copper can be determined within an error of 1μg. (cf. Table I). Determination of a mixture of lead and cadmium gave larger error, as shown in Table II.
