氯离子对COD测定的影响及消除方法

为保证测定污水中COD数据的准确性,分析了不同浓度氯离子对污水中COD测定的影响,并对不同浓度氯离子的消除方法进行了实验和探讨。实验结果表明:当氯离子的质量浓度小于2000mg/L时,用国标法简单准确,当氯离子的质量浓度大于2000mg/L小于20000mg/L时,用氯气校正法更为合适。

Effect and Elimination of Chloridion to COD Determination in Sewage

Elimination effect of different Cl- concentration to COD determination was investigated through experiments. The results showed that the condition and degree of COD elimination for chlorine compensated method and National Standard Method was the same, and the accuracy of the two methods were comparable. The national standard method was simple and accurate in COD determination with the Cl- concentration less than 2000mg/L in sample. The chlorine compensated method was suitable for COD determination with the Cl- concentration higher than 2000mg/L and less than 20000 mg/L in sample.