分段重铬酸钾法测定高氯离子废水COD方法研究

通过对高盐废水COD测定时氯离子干扰与氧化剂浓度的关系研究发现:氧化剂浓度对氯离子干扰程度有较大的影响。根据研究结果,提出了用分段重铬酸钾法测定高盐废水COD的设想,并对此设想进行了验证。验证结果表明:用分段重铬酸钾法测定高盐废水COD的设想是完全可行的;而且方法的准确度较好,相对误差<9%,实际废水加有机物的回收率>92%。

The study on measuring COD of wastewater with high content of chlorine by the means of potassium dichromate of different concentration

The result of study on relationship between chlorine ion and concentration of oxidant during measuringCOD of wastewater with high content of salt, shows thatoxidant concentration influences interference on measurement caused by chlorine ion. According to the result of study, the proposal of measuring COD of wastewater with high content of salt is raised, and verified as well. The result of verification shows that the proposal of measuring COD of wastewater with high content of salt by the means of potassium dichromate of different content is viable, and accuracy of it is good, with relative error of less than 9%, recycle rate of wastewater and organic substance is more than 92%.