两种方法测定水中化学需氧量的比对

Comparison of Two Methods for Determining COD Chemical Oxygen Demand in Water

化学需氧量是测定水中有机物质含量的重要指标之一[1]。我们现阶段一般用分光光度法和重铬酸盐法。本文主要讲述的是分光光度法测定水中化学需氧量。对在150℃相同的温度下不同的时间测水中4个不同浓度化学需氧量的探讨。以及将HJ828-2017水质化学需氧量的测定重铬酸盐法与EPA 410.4-1993水质化学需氧量的测定分光光度法美国国家环保局方法进行比较。两种方法的优缺点的探讨。

Chemical oxygen demand(COD) is one of the important indexes for the determination of organic substances in water. Spectrophotometry and dichromate are currently used. The chemical oxygen demand in water was determined by spectrophotometry. The chemical oxygen demand(COD) of four different concentrations in water at the same temperature of 150 ℃ at different times was discussed. HJ828-2017 water quality chemical oxygen demand determination dichromate method and EPA 410.4-1993 water quality chemical oxygen demand determination spectrophotometric method were compared. The advantages and disadvantages of the two methods were discussed.