摘要
重铬酸钾法测定COD时,一般存在着该法对苯及其芳烃类的有机物氧化率偏低的问题.经实验证明,对苯、苯甲醛等含苯环类物质的氧化率低于50%,而改用Ce(SO4)2作氧化剂则氧化率大大提高,且对环境和分析人员的危害性大大降低.对于印钞废水,硫酸高铈法所测得COD比重铬酸钾法高出41%左右.
There exists a problem of lower percentage of oxidization to the organic matters of benzene and aromatic hydrocarbons when we determine the COD by the method of potassium dichromate titration. From the results of experiments, the COD determined by the method of potassium dichromate titration is 50% lower than that of theory, and this method itself is harmful to environment and people. The COD determined by the method of ceric sulfate titration is higher than the COD determined by the method of potassium dichromate titration.
出处
《四川师范大学学报（自然科学版）》
CAS
CSCD
2003年第6期649-651,共3页
Journal of Sichuan Normal University（Natural Science）
基金
四川省科技厅重点科研基金资助项目
关键词
化学需氧量
废水
氧化率
绿色测定方法
Chemistry oxygen demand
Wastewater
Percentage of oxidation
Green determination method
