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Bu Yisun (Hangzhou Environmental Protection Research Institute, CCRI, Xiaoshan, 311201)  
The meaning of the theoretical chemical oxygen demand (ThoD) is discussed in this paper.The highest oxidation value for elemental compostions of organic compounds is the mathematical calculation foundation of ThoD. CODcr for organic compounds of simple construction is well comformed to the ThoD.But the ratio of CODcr to ThoD for complex compounds is about 90% or less.
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