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小木虫论坛-学术科研互动平台 » 化学化工区 » 环境 » 监测分析 » 【求助】三价锰分光光度法测量cod
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[交流] 【求助】三价锰分光光度法测量cod

有谁知道这个方法的原理吗？
Summary of Method
Chemical oxygen demand (COD) is defined as ¡°... a measure of the oxygen equivalent of the organic matter content of a sample that is susceptible to oxidation by a strong chemical oxidant¡± (APHA Standard Methods, 19th ed., 1995). Trivalent manganese is a strong, noncarcinogenic chemical oxidant that changes quantitatively from purple to colorless when it reacts with organic matter. It typically oxidizes about 80% of the organic compounds. Studies have shown that the reactions are highly reproducible and test results correlate closely to Biochemical Oxygen Demand (BOD) values and hexavalent chromium COD tests. None of the oxygen demand tests provide 100% oxidation of all organic compounds.
A calibration is provided which is based on the oxidation of Potassium Acid Phthalate (KHP). A different response may be seen in analyzing various wastewaters. The KHP calibration is adequate for most applications. The highest degree of accuracy is obtained when test results are correlated to a standard reference method such as BOD or one of the chromium COD methods. Special waste streams or classes will require a separate calibration to obtain a direct mg/L COD reading or to generate a correction factor for the precalibrated KHP response. The sample digestion time can be extended up to 4 hours for samples which are difficult to oxidize.

所需试剂如下：
除氯盒 三价锰COD试剂瓶（配置好的锰离子溶液） 浓缩硫磺酸
去离子水
有用过这种方法的吗？有谁知道其原理，国标方法里面好像没有。
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