硝酸银滴定法测定废水中氯离子含量

Determination of Chloride in Wastewater by Silvernitrate Titration

本文采用硝酸银滴定法测定废水中氯离子浓度,通过测定同一样品不同体积氯离子浓度,计算两次不同体积消耗的硝酸银体积差与两次不同的取样体积差进行氯离子浓度,修正了空白和滴定终点判断误差对水体中氯离子测定干扰,提高了水样中氯离子浓度测定准确度。采用氯化钠标准溶液添加到样品中,加标回收率在98.9%~100.4%之间。采用新方法测定13个废水样品,废水样品氯离子含量在95~802 mg/L之间。

In this paper,the concentration of chloride in wastewater is determined by silvernitrate titration.By measuring the concentration of chloride in different volume of the same sample,the volume difference of silver nitrate consumed twice with different volume and the volume difference of two different samples are calculated to correct the interference of blank and titration end-point judgment on the determination of chloride in water,and the accuracy of chloride concentration determination in water sample is improved Degree.Sodium chloride standard solution was added to the sample,and the recovery was 98.9%~100.4%.Thirteen wastewater samples were determined by the new method.The chloride content of wastewater samples ranged from 95 to 802 mg/L.