By replacing the high-cost special reagents of HACH with the self-prepared digestion solution, the spectrophotometry was used to determine COD concentration in sewage.

• 以自配消解液代替成本较高的HACH专用试剂；采用分光光度法测定了污水.；的COD浓度；对影响测定结果的诸多因素进行了试验研究；确定了最佳操作条件。