城市污水中电导率与COD相关性分析

标准法－重铬酸钾法测定COD的缺点是测定时间长，氯离子干扰大。微波密封消解法对此有了改进，具准确度高，精密度好等优点，但存在着设备较贵，试剂消耗量大，分析费用较高的问题。通过对郑州市金水河、东风渠、熊耳河三条河流的连续定位监测，结果表明，废水中的电导和COD两者之间存在着线性关系，在正常情况下，测定电导后，根据两者之间的线性关系，求算COD的值，从而缩短了实验的繁琐，减轻了污染，节约时间和费用。

Analysis on Relativity between CODcr and Conductance of Urban Sewage

The usual determination method of chemical oxygen consumed is potassium dichromate method.The shortcoming of this way is that the digestion time is long,the operation by interference of chloric ion is severe.Microwave sealed digestion method makes much improvement,its advantage is that analytical precision and accuracy are increased as well.But the equipment is expensive and expensive Ag 2SO 4 added in the procession of experiment,the lost of analysis is highter.This paper reported the state of Diongfeng river,Jinshui river and Xionger river by continue measure and experiment.The results showed that there existed relation of linearity between conductance and CODcr of urban sewage.Under usual condition,according to the relation of both,we could attain CODcr,So the complexity of experiment was cut down and pollution was diminished,time and cost were economized.