Several measuring methods of COD were introduced in this paper,and the influence factors for COD result were analyzed.Content of Cl-was the biggest influence factor,in addition,the degree of standard operation by the operator affect the result also.The methods for improvement testing accuracy were presentation.%该文简述了各类COD测定方法,并分析了影响COD测定结果的各种内外部影响因素,其中氯离子对COD的测定结果影响最大,操作者严格执行操作规程的程度也在一定程度上影响其结果,同时给出了提高测定结果准确度的方法。
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