微分示波电位滴定法 Ⅱ.铂电极上Cu^(2+)的DDTC^-滴定

DERIVATIVE OSCILLOGRAPHIC POTENTIOMETRIC TITRATION Ⅱ.TITRATION OF Cu^(2+) BY DPTC^- ON PLATINUM ELECTRODE

卜海之等报导,当铂、碳或银电极上沉积有一层Ag-TPB(TPB代表四苯硼钠离子)时,该电极对Ag^+及TPB^-均有响应,这样的电极可用于Ag^+及TPB^-的示波电位滴定,其滴定曲线一般为台阶形.若在线路中加一电容就可将电位曲线微分为峰形,并可以荧光点的最大位移指示滴定终点.本文报导用二乙基二硫代氨基甲酸(DDTC^-)滴定Cu^(2+),目的在于将微分示波电位滴定法应用于一大类为数众多的沉淀反应.

The results of determination of cupric ion in synthetic and superconductor samples byDDTC^- on platinum electrodes using derivative oscillographic potentiometric techniqueproves the simplicity and rapidity of the method proposed by the authors.