重铬酸盐法测定水中化学需氧量影响因素探析

Analysis of Factors Influencing COD in Water by Dichromate Method

针对重铬酸盐法测定水中化学需氧量(COD)影响因素进行分析,通过试验方式,对水样进行测定和计算。结果显示,使用空白水质,选择增流水,空白测定结果以及水的放置时间存在一定联系,最好使用蒸馏水。试验过程中,操作者的手动能力、样品称量和配置均对测定结果产生关键性影响。

The influence factors of the determination of chemical oxygen demand（COD） in water by dichromate method are analyzed, and the water samples are measured and calculated by the method of test. When the water quality is used and the water is selected, there is a certain connection between the results of the blank determination and the time of water placement. Therefore, it is best to use distilled water. In the process of testing, the operator＇s manual ability, sample weighing and configuration have a key impact on the results of the test.