电位滴定法测氢氧化钠中氯化钠含量

Determination of Sodium Chloride in Sodium Hydroxide by Potentiometric Titration

通过电化学方法,利用银电极对氯离子的选择性,采取电位滴定法测定氢氧化钠中氯化钠的含量,与分光光度法进行的检测结果进行比较,并进行了回收试验。结果表明,电位滴定法与分光光度法检测结果有较好的符合性,检测结果偏差及标准差满足测试要求,回收试验结果满足定量分析的要求。该方法操作简单、准确度高、对环境污染小,可准确测定氢氧化钠中氯化钠的含量。

Through the electrochemical method and the selectivity of the silver electrode to chloride ion, the potentiometric titration method was used to determine the content of sodium chloride in sodium hydroxide. The results were compared with the resuhs of spectrophotometry and recovery experiments were carried out. The results showed that the potentiometric titration and spectrophotometric detection resuhs had a good correlation, test results deviation and standard deviation met the test requirements, recovery test resuhs met the requirements of quantitative analysis. The method is easy to operate with high accuracy and low environmental pollution, the content of sodium chloride in sodium hydroxide can be accurately determined.