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KMID : 1059519940380120880
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Journal of the Korean Chemical Society
1994 Volume.38 No. 12 p.880 ~ p.884
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Chemical Oxygen Demand based on Spectrophotometric Measurement of Permanganate
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Case Myung-Zoon
Ly Suw-Young
Kim Mi-Kyung
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Abstract
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An indirect spectrophotometric method, presumably heretofore unmentioned, for the rapid determination of COD in the presence of chloride of high concentration is described. The alkaline sample is refluxed to react with a definite amount of permanganate, present in excess. A photometric measurement at 535 nm for the extent of the fading of the permanganate color after refluxing completes the procedure. The optimum conditions which give the absorbance-concentration plot the maximum linearity and slope in the range of 0∼5 ppm COD are as follows: reflux at 100℃ for 10 min in the presence of 0.15 mM permanganate and 0.2% NaOH with a sample size of 5 ml. An overall running time was less than 15 min. The t-test reveals that the proposed method is not significantly different from the official method.
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