摘要
研究了用硫酸锰代替贵金属硫酸银作催化剂,在H2SO4—H3PO4介质中,重铬酸钾回流法测定水样中CODcr的新方法。通过实验,确定了最佳测定条件:MnSO4浓度为1×10-1mol.L-1;混酸溶液(H2SO4:H3PO4)=5:1(体积比);回流时间10min。并与标准方法进行了对比,准确度和精密度同标准法相近,大大节约了分析时间。
A newanalytical method of the chemical oxygen demand (COD) for water sample is developed. The manganese sulfate substitutes the silver sulfate for the catalyst with the H2SO4-H3PO4 instead of H2SO4. The results show that the optimal condition is the 1×10^-1 mol. L^-1 of manganese sulfate with the ratio of H2SO4 to H3PO4 = 5:1 and 10-minutes of the condensation time. It is compared with the standard model and the analytical time is greatly reduced with almost the same accuracy and precision.
出处
《成都信息工程学院学报》
2006年第2期273-276,共4页
Journal of Chengdu University of Information Technology
基金
四川省科技厅应用基础(GY029-010-02)
成都信息工程学院科技发展基金资助(CSRF200402)