沉淀电导滴定法测定水中氯离子含量

Measurement of Chloride Ion Content in Water by Conductometric Titration

采用沉淀电导滴定法,用硝酸银标准溶液滴定水样中氯离子的含量,利用单因素法设计实验,研究了pH值、水样体积、滴定剂浓度、搅拌强度、滴定剂滴加速度、干扰离子等因素的影响。结果表明,在充分搅拌和用硝酸作为掩蔽剂、保持pH=2～7的酸度条件下,用0.1 mol/L的AgNO3标准溶液作为滴定剂,可以快速准确地测定水中氯离子含量。采用该方法分析了自来水、雨水、河水、山泉水、井水和锅炉水等不同水样中的氯离子含量,结果令人满意。

The content of chloride ion is determined in different water samples by conductometric titration with nitric acid silver standard solution.The experiment conditions,such as pH range,water volume,concentration of titrant,stir intensity,drops of acceleration of titrant,interference ion are investigated by single factor analysis.The optimum conditions of experiment are as following：while solution is stirred strongly,the range of solution pH is from two to seven,with nitric acid as masking agent,0.1 mol/L nitric acid silver standard solution as titrant.The results show that the method is quick and accurate.The present method can be applied to determination content of chlorine ion in tap water,rain water,river water,spring water,well water,boiler water of samples with satisfaction.