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用离子选择电极测定水和其他材料中的微量氯,已得到广泛的应用并取得满意的结果。用此法测定纯铟中的微量氯国内至今未见报导。本文研究了用氯离子选择电极指示,在适量的丙酮介质中用电位滴定——格氏图解法测定纯铟中微量氯。本实验选择了适当的测试条件和简便的分离干扰元素的方法。对纯铟中氯的测定灵敏度为5ppM,回收率为102～112％。
Determination of trace amounts of chlorine in water and other materials with ion-selective electrodes has been widely used and satisfactory results have been obtained. Determination of trace amounts of pure indium in this method has not been reported in China so far. In this paper, the chloride ion selective electrode is used to indicate the trace chlorine in pure indium is determined by potentiometric titration-Grignard method in an appropriate amount of acetone. The experiment selected the appropriate test conditions and simple method of separation of interference elements. The determination sensitivity of pure indium in chlorine is 5ppM, the recovery rate is 102 ~ 112%.