Chemiluminescence detection of permanganate index (CODMn) by aluminol-KMnO4 based reaction
TIAN Jinjun , HU Yonggang , ZHANG Jie
DOI:
Received March 04, 2007,Revised September 30, 2007, Accepted , Available online
Volume 20,2008,Pages 252-256
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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.
