化学需氧量测定中H2O2干扰消除方法  

Elimination method of HO interference in determination of COD

作　　者：李莉[1] 李友皝 梁嘉良 赵志伟 LI Li;LI Youhuang;LIANG Jialiang;ZHAO Zhiwei(College of Environment and Ecology,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学环境与生态学院,重庆400045

出　　处：《实验技术与管理》2021年第9期47-53,60,共8页Experimental Technology and Management

摘　　要：以活化过氧化氢为主要反应机理的芬顿和类芬顿法是去除难降解有机物的重要技术之一,而用重铬酸盐法测定芬顿体系的化学需氧量(CODCr)时,残余的H2O2会对测定产生严重的干扰。该文系统地比较了间接扣除、酶催化分解、MnO2催化分解、升温调pH和加氧化还原剂5种干扰消除方法在模拟污水和实际废水中的效果。通过对高低浓度体系下CODCr的测试相对误差分析,对H2O2干扰消除方法进行了优选。并在实际废水中进行了检验,结果表明:间接扣除法对消除实际废水CODCr测定中的H2O2干扰最为有效。Fenton and Fenton-like methods based on the main reaction mechanism of activated hydrogen peroxide are one of the important technologies for the removal of refractory organic compounds.However,when the CODCr of Fenton system is measured by dichromate method,the residual H2O2 will interfere with the measurement.This paper systematically compares the effects of five interference elimination methods such as indirect deduction,enzymatic decomposition,Mn O2 catalytic decomposition,heating/p H adjustment,and addition of redox agents in simulated sewage and actual wastewater.In order to analyze the relative error of CODCr in high and low concentration system,the method of H2O2 interference elimination is optimized.The results show that indirect deduction method is the most effective method to eliminate the interference of H2O2 in CODcr determination.

关 键 词：有机物测定 芬顿法 H2O2 消除干扰 高级氧化 

分 类 号：O741[理学—晶体学]