Chemiluminescence detection of permanganate index (COD_(Mn)) by a luminol-KMnO_4 based reaction  

作　　者：TIAN Jinjun HU Yonggang ZHANG Jie 

机构地区：[1]College of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China [2]Nanyang Institute of Technology, Nanyang 473004, China

出　　处：《Journal of Environmental Sciences》2008年第2期252-256,共5页环境科学学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China （No. 20005005） ;the Chenguang Project of Wuhan City （No. 20005004026）.

摘　　要：A novel chemiluminescence （CL） system for determination of permanganate index （CODMn） combined with flow injection analysis has been proposed in this study. On the basis of the chemiluminescent reaction of luminol-KMnO4 system, light emission caused by luminol-KMnO4 system was detected by the photomultiplier tube, and its intensity caused by the appearance of KMnO4 after sample digestion was inversely proportional to CODMn. Effects for CODMn determining such as pH, concentrations and interference were investigated in detail. A detection limit of 0.3 mg/L CODMn with a linear range of 0.3-200 mg/L for its theoretical CODMn was obtained under the optimized experimental conditions. The relative standard deviation was 4.3% for 5.0 mg/L CODMn （n = 11）. This CL flow system for determining CODMn was simple, rapid, and suitable for automatic analysis. The data obtained by the present method were fairly in good agreement with those obtained by the standard titrimetric method. It has been applied to determine real samples with satisfactory results.A novel chemiluminescence （CL） system for determination of permanganate index （CODMn） combined with flow injection analysis has been proposed in this study. On the basis of the chemiluminescent reaction of luminol-KMnO4 system, light emission caused by luminol-KMnO4 system was detected by the photomultiplier tube, and its intensity caused by the appearance of KMnO4 after sample digestion was inversely proportional to CODMn. Effects for CODMn determining such as pH, concentrations and interference were investigated in detail. A detection limit of 0.3 mg/L CODMn with a linear range of 0.3-200 mg/L for its theoretical CODMn was obtained under the optimized experimental conditions. The relative standard deviation was 4.3% for 5.0 mg/L CODMn （n = 11）. This CL flow system for determining CODMn was simple, rapid, and suitable for automatic analysis. The data obtained by the present method were fairly in good agreement with those obtained by the standard titrimetric method. It has been applied to determine real samples with satisfactory results.

关 键 词：FLOW-INJECTION CHEMILUMINESCENCE permanganate index （CODMn） luminol-KMnO4 

分 类 号：X832[环境科学与工程—环境工程]