摘要
在重铬酸盐法(HJ828-2017)基础上检测水样,计算了消解后水样的化学需氧量(COD)表观值;在酸性条件下利用硫酸亚铁铵直接滴定水样,计算了水样铬离子浓度。然后利用铬离子与COD之间的关系,将铬离子浓度转化成COD值。用表观COD值加上铬离子转化的COD值就是水样中真实COD值。结果表明:该法使用试剂种类少,操作步骤简单,有利于环境监测过程中大批量含铬废水的测定。
The water sample was detected on the basis of the dichromate method(HJ828-2017),and the apparent Chemical Oxygen Demand(COD)value of the water sample after digestion was calculated.On the other hand,the water sample is directly titrated with ferrous ammonium sulfate under acidic conditions to calculate the chromium ion concentration of the water samples.Then,the relationship between chromium ion and COD is used to convert the chromium ion concentration into COD value.Finally,the apparent COD value plus the COD value converted by chromium ion is the true COD value of the water samples.This method uses few reagent types and simple operation steps,which is beneficial to the determination of large quantities of chromium-containing wastewater in the environmental monitoring process.
作者
刘雯
于晓青
Liu Wen;Yu Xiaoqing(Tianjin Eco-Environmental Monitoring Center,Tianjin 300110,China)
出处
《绿色科技》
2021年第12期76-78,共3页
Journal of Green Science and Technology
关键词
重铬酸盐法
化学需氧量
铬离子
dichromate method
chemical oxygen demand
chromium ion
