络合物电位滴定法测定工业气体及废水中硫化物含量的研究

Study on the Determination of Sulphide in Industrial Gas and Waste Water by Complex Potentiometric Titration

本文以自制涂丝Ag Ag2S电极为指示电极,Hg2+ 半胱氨酸络离子作滴定剂,在SAOB介质中用电位滴定法测定了工业气体和废水中硫化物含量。滴定终点突跃明显,勿需绘制滴定曲线即可确定终点体积,检测下限可达10μg/L。方法简便、快捷、灵敏,是对电位滴定法测硫的一大改进。

A new method for the determination of sulphide in industrial gas and waste water is described by complex potentiometric titration,in which an coated wire Ag-Ag_2 S electrode serves as the indicator electrode and Hg^(2+)-cysteine complex serves as titrant. The properties of the electrode,the optimal determination conditions and the effects of other substances has been studied. The end point is obvious, and the determination limit is 10 μg/L.