通过对地表水、生活污水、工业废水COD、TOC、BOD值的测定, 并做了数理统计回归分析, 得出COD和TOC、BOD之间存在线性相关性, 相关系数均达到0.85以上。由于采用紫外分光光度法可直接测定水质COD含量, 因而可利用COD与后两者之间的线性相关性, 间接测定出BOD值和TOC值。实验结果表明, COD和TOC、BOD三者之间存在线性相关性, 而且对于不同水体, 三者之间呈现出不同的线性相关关系, 因此可针对不同水体建立相应的相关关系模型, 从而实现只测定COD参数, 就可同时获得TOC和BOD。

By measuring the values of COD, TOC and BOD of the surface water, domestic wastewater, and industrial wastewater and analyzing the data, the linear relation between the values of COD and TOC or BOD are obtained, all of the correlation coefficients are greater than 0.85. The value of COD can be measured by UV-Vis Spectroscopy directly, then the values of BOD and TOC are calculated based on the correlations between COD, BOD and TOC. For different water, the correlations are different, so a calculation mode can be established with the corresponding correlation. By this, only the measure of COD is needed, the other two dates can be obtained simultaneously.