摘要：

介绍了污水处理厂化验室用重铬酸钾法同时测定污水处理前和处理后的COD_Cr浓度时，重铬酸钾溶液的浓度改为0.0500mol/L，硫酸亚铁铵溶液的浓度改为0.02mol/L，不但不会影响测定结果，还能有效地降低化验成本，节约工作时间，同时减少化验室废水对环境造成的二次污染。

关键词: 污水处理厂, 化学耗氧量, 重铬酸钾, 硫酸亚铁铵

Abstract:

It is introduced that when the COD_Cr concentrations both before and after the treatment are determined by using potassium dichromate method in the wastewater treatment plant laboratory, the concentration of potassium dichromate solution is adjusted to 0.050 0 mol/L and the concentration of ammonium irons(Ⅱ) sulfate hexahydrate solution to 0.02 mol/L. This will not influence the determination result, but can reduce the essay cost, save working hours and reduce the secondary environmental pollution caused by the wastewater from the laboratory.

Key words: wastewater treatment plant, chemical oxygen deman, potassium dichromate, ammonium irons(Ⅱ) sulfate hexahydrate

中图分类号: 

• X832