硝酸银滴定法测量水中氯化物含量的不确定度评定

Uncertainty Evaluation of Chloride Content in Water Using Silver Nitrate Titration Method

采用硝酸银滴定法测量水中氯化物含量,根据化学分析项目建立数学模型,对测定水样中氯化物的不确定度来源-配制NaCI标准溶液、标定AgNO3标准溶液浓度、测水样消耗AgNO3溶液体积、取水样体积、样品重复性测定等参数引入的不确定度分量进行识别和分析,进而对所有不确定度分量进行量化,得出测量不确定度结果,提出了该方法的合成不确定度及监测过程中的注意环节。

Silver nitrate titration method was used to measure chloride content in water.Mathematical model was established according to chemical analysis parameters,and the uncertainty components including preparation of standard solution of NaCl,concentration of calibrated standard solution AgNO3,volume of consumed AgNO3 in measurement of water solution and volume of water sample,which led by uncertainty sources and other parameters during measurement of chloride content in water were distinguished and analyzed.Uncertainty components were further quantized and the results of measurement uncertainty were obtained.Finally,the synthesis uncertainty of the method and attentions in process of monitoring were proposed as well.