1954 年 74 巻 12 号 p. 1402-1403
The effect of the addition of nonionic surface active agents, such as Tween 80, to the halide solutions in the silver titration with an adsorption indicator, was examined. It was found that the presence of such surfactants prevented the precipitation of silver halides during the course of titration and the solution remained colloidal and clear. The color change of the indicator was sharp and clear as that in acid-alkali titration and the end-point was observed much more easily. The presence of interfering electrolytes, such as sodium sulfate, failed to reduce the accuracy of this titration by the action of the surface active agents.