H2S气敏电极的研制、性能及其初步应用

STUDIES ON STRUCTURE,PERFORMANCE AND ITS INITIAL APPLICATION OF A H_(2) S GAS-SENSING ELECTRODE

本文报告了用全固态Ag_(2)S电极做指示电极和全固态氟离子电极做参比电极所研制的H2S气敏电极的结构、性能及其在印染污水分析中的初步应用。电极的线性范围5×10^(-8)-1×10^(-2)MS^(2-),响应快,重现性较好。除浓度较高的CN^(-)、I^(-)和CNS^(-)有干扰外,其他常见阴离子无干扰。对印染污水用电极悬空测定(加入稀释法),试液不需任何处理,也不沾污电极。方法简便、快速,能满足控制分析要求。

Structure and performance of a H2S gas-sensing electrode and its initial application in printing and dyeing sewage analyses are reported in this paper.The H2S gas-sensing electrode consists of an all-solid state Ag_(2)S membrane indicating electrode and an all-solid state LaF3 reference electrode.The practical linear range of the H2S electrode is within 5×10^(-8)-1×10^(-2)M sulfide solution.The electrode responds to hydrogen sulfide is fast and the reproducibility of measurements is better,Except for higher concentration cyanide,iodide and thiocyanide ion other common anions don’t interfere with measurements.If the H2S gas-sensing electrode is used to determine sulfide ion in printing and dyeing sewage(by the addition dilution method),the sample solution does not need any treatment and the electrode will not be contaminated either,because the sensor is hung in air gap over the sample solution.This method is simple,fast,and can be content with requirements of control analyses.