哈希比色法与重铬酸盐法测定水中COD的对比分析

文章通过空白、标准样品、实际样品测定实验及色度影响实验,对两种COD测定方法进行比对,验证方法的准确度和精确度。结果表明:哈希比色法在测定色度小的水样时,多次测定均值与重铬酸盐法测定结果相差不大;测定色度较大水样时,可以利用色度与测定结果偏差的相关性进行结果修正。

Comparison Study on COD Determination by Hash Colorimetry and Dichromate Titration

Through blank test,standard sample test,real sample determination test and chroma influence test,this paper compares the two methods of COD determination and verifies the accuracy and precision of the two methods.The results show that: when testing light chromaticity samples,the average data determined by Hash colorimetry method is close to those by dichromate titration method;however when testing heavy chromaticity samples,the experimental results by Hash colorimetry method could be corrected by the correlation between chromaticity and deviation of determination results.