国家及行业标准中化学需氧量检测原理简析

Briefly Analysis of the Chemical Oxygen Demand Test Principle in National and Industry Standards

对比了我国现行国家标准、行业标准中水样化学需氧量(COD)的测试方法,简要分析了各标准方法的测试原理、计算公式以及各标准方法的适用范围。指出了各标准方法的差异,对于需要回流装置的试验方法还给出了相应的装置示意图。最后,根据水样COD指标范围和水样氯离子含量的不同,给出了相应情况下较为适宜的标准方法以供实验室检测人员选择。

The paper gives the comparison of the test methods in national and industry standards to determine chemical oxygen demand （ COD ）. Moreover, this paper briefly analyzes the testing principle and calculation formula of the standards, and gives their scope of testing application. The paper shows the difference of the standard methods, for the standard methods which are need reflux device, the paper had offered the corresponding device schematic diagram. According to the COD index and content of chlorine ion of the water sample in different, it is given the more appropriate standard method under different situations for choose of laboratory technicians at the end of the paper.