用AgNO_3-H_2SO_4溶液代替Ag_2SO_4-H_2SO_4溶液测定水质COD值的可行性探讨

Feasibility Study on the Method Using AgNO_3-H_2SO_4 Instead of Ag_2SO_4-H_2SO_4 for Determination of COD

研究了用硝酸银代替昂贵的硫酸银作催化剂,在H2SO4介质中,重铬酸钾回流法测定油田污水COD的新方法。通过t检验,验证该方法与标准法的测定结果一致,精密度符合国家监测标准要求。表明AgNO3可代替Ag2SO4作为重铬酸钾回流法的催化剂测定含油污水的COD。

A novel analytical method of chemical oxygen demand （COD） for oil waste water is developed, with silver nitrate substituting the expensive silver sulfate as catalyst in H2SO4. By t test,the measured values by the novel method are verified to be in accordance with those by the national standard method, and the precision degree meets the require of national monitoring standard. It shows that silver nitrate can be used as catalyst to determine oil waste water＇s COD in place of silver sulfate.