氯离子对化学需氧量的测试影响及应对策略

Influence of Chloride Ion on Chemical Oxygen Demand Analysis and Its Elimination Method

化学需氧量(COD)是反映水体污染的常用指标,能否实现它的准确测试至关重要。通过实验量化了水中共存的高浓度氯对重铬酸钾法测试COD的影响,并实验验证了硫酸汞的消除作用。结果显示,氯对COD测试的影响程度与其浓度呈线性关系,硫酸汞可消除低浓度氯对COD测试的影响,研究可为COD的准确测试提供一定的参考。

Chemical oxygen demand(COD)is a common index reflecting water pollution,whether it can achieve the accurate test is very important.In this study,the effect of co-existing high concentration chlorine in water on COD measurement by potassium dichromate method was experimentally quantified,and the elimination effect of mercury sulfate was verified experimentally.The results show that the degree of influence of chlorine on COD test is linear with its concentration,and mercury sulfate can eliminate the influence of low concentration of chlorine on COD test.The study results can provide some reference for the accurate analysis of COD.