高氯低浓度污水COD_(Cr)测定方法探讨

Discussion on the Determination Method of COD_(Cr) in High Chlorine and Low Concentration Sewage

通过不同试验方法对高氯低浓度污水COD_(Cr)的测定,硫酸汞与氯离子的量为20:1时,对氯离子有较好屏蔽效果,使干扰程度降到较低水平。低浓度重铬酸钾替代高浓度重铬酸钾进行消解,且适当缩短加热时间,可以使所测结果更接近真实值。

Through using different test methods to determine the CODer in high chlorine and low concentration sewage, we find that when the ratio of mercury sulfate and chloride ion is 20：1,the shielding effect of chloride ion is better, and the degree of interference is reduced to a lower level. Through using the low concentration of potassium dichromate instead of high concentration of potassium dichromate, and appropriately shorten the heating time, we can get a result closely to the true value.