化工环保2017，Vol.37Issue(4)：491-494,4.DOI:10.3969/j.issn.1006-1878.2017.04.022
高氯离子、低COD废水中COD的测定
Analysis of COD in wastewater with high chloridion and low COD
许树华 1刘正 1李宇1
作者信息
- 1. 中国石油化工股份有限公司北京化工研究院,北京100013
- 折叠
摘要
Abstract
The potassium dichromate method for analysis of COD in wastewater with high chloridion and low COD was established.The factors affecting the determination effect were studied using the simulated high chloridion wastewater containing calcium chloride with glycerinum,dichloropropanol and β,β'-nemamort,respectively.The experimental results showed that:Small data fluctuation range and low relative error (-1.4％ to +0.4％) could be achieved using the low concentration (0.05 mol/L) potassium dichromate solution as oxidant;For analysis of COD in wastewater with high chloridion and low COD,when the mercury sulfate masking agent was added according to m (HgSO4) ∶ m (CF)=10 ∶ 1for more than 100 mg/L of COD and m (HgSO4) ∶ m (Cl-) =10 ∶ 1 for less than 100 mg/L of COD,and the potassium dichromate solution with 0.05 mol/L of concentration was used as oxidant,the interference of chloridion on COD determination could be eliminated,the relative error was within 5％;Good reproducibility is proved by using the method for determination of COD in the actual epichlorohydrin production wastewater,when m (HgSO4) ∶ m (Cl-) was 10 ∶ 1 and 20 ∶ 1,the relative error was +3.3％ and +2.9％,while the average recovery rates was 103.4％ and 102.9％,respectively.关键词
环氧氯丙烷废水/氯离子/COD/重铬酸钾/掩蔽剂Key words
epichlorohydrin wastewater/chloridion/COD/potassium dichromate/masking agent分类
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许树华,刘正,李宇..高氯离子、低COD废水中COD的测定[J].化工环保,2017,37(4):491-494,4.
