镇江城内运河水COD含量的分析

Determination of content of COD in water samples taken from the canal in Zhenjiang City proper

通过对镇江城内运河水定点、连续采样,用重铬酸钾法测定分析,发现水中COD含量在4 82～119mg/L之间,部分水域的水质已经污染,COD含量随水流方向逐渐升高,生活污水的排放是影响COD含量的最主要因素。

Samples of water are taken from five chosen locations in the canal in Zhenjiang city proper, and are determined with dichromate method. The results are that the content of chemical oxygen demand (COD) is between 4.82 and 119 mg/L, that part of the section of the canal has been contaminated, the content increases downwards gradually, and the main factor that affects the content of COD is the discharging of domestic wastewater.