電量滴定法の研究 (第1報)
電気量直読式定電流電量滴定装置の研究とその応用
1960 年 80 巻 10 号 p. 1411-1414
詳細
1960 年 80 巻 10 号 p. 1411-1414
An apparatus for constant-current coulometry and result of titrations using this apparatus are described. This newly devised apparatus is provided with a constant-current power supply using a double-negative feedback circuit in which several levels of constant current is always obtained accurately by only switching and a counter which indicates the quantity of electricity used irrespective of the current value and a counter working in conjunction with this switching of the current and which counts the different frequency pulse and indicates the quantity of electricity used, irrespective of the current value. By the use of such an apparatus, constant-current coulometry, which was not generally adopted due to inconvenience of handling, can be put to practical use by ease of handling and a high precision can be obtained. Moreover, time required for titration is shortened since it is possible to change electrolytic current during titration.
A good precision was obtained by titration of 0.1-10mg. of arsenic trioxide by electrolytic generation of bromine, with coefficient of variation of 0.1%.
