COD与回流时间的相关性研究及测定方法改进

Improvement on the Method for Verifying Relativity of Circumfluence Time and COD

通过以大量的数据分析了回流时间对化学耗氧量测定的影响,得出40min时水样的氧化率在97.7%～99.6%,平均为99%,可将回流时间改为40min测定COD,然后将所得结果通过系统校正,与标准法相比较,经统计检验,精密度、准确度等均符合要求,可用于批量较大、水质成份稳定的监测.

This paper analyzes the influence of circumfluence time in COD with a large amount of data.Results show that at 40minute the range of the ratio of oxidation is 97.7%~99.6%,with average ratio of 98%.So the circumfluence time can be changed to 40 minutes to measure COD,then compare the data adjusted with that of standard method,its precision and accuracy are confirmed through statistical test.This method can be used in the surveillance test for large batches of wastewater with stable composition.