焦化废水中化学耗氧量测定方法的改进

Improvement on the Determination of COD in the Coking Wastewater

废水中化学耗氧量的测定 ,国标用重铬酸钾法 ,该方法不仅酸介质用量大 ,而且需 2h加热。应用改进后方法 ,只需 2 0mim ,在少量酸介质的条件下 ,即可测定 ,既节约试剂又节约时间。

The comparison was made between two measuring method of COD for coking wastewater.the improved method had advantages of fewer quantity of acid,less heating time and low cost over the potassium dichromate method of national standard.