Preparation and Characterization of Home-Made Silver Sulphide Based Chloride Selective Electrode

Introduction A number of works on cationic sensors have been reported in literatures [1] but less attention has been given towards the development of anionic sensors though there is a need for analysis of varieties of anions in different environmental, biomedical, industrial as well as chemical samples[2-3]. Anion sensors are simple, low cost, convenient, portable and provide quick response towards selected ions. Silver sulphide based ion selective electrodes (ISE) are among well known ISE’s for being well behaved electrodes in terms of their sensitivity and selectivity in analysis of anionic species and have been in operation for long [4-5]. In the previous study, preparation and characterization of silver sulphide based iodide selective electrode was reported [6]. Present study is concerned mainly on preparation and characterization of silver sulfide based chloride selective electrode. Silver sulphide based chloride selective electrodes (Ag2S-AgCl electrodes) have been fabricated in the laboratory by varying the composition. The phase composition, surface morphology of Ag2S-AgCl electrodes are studied. The electrodes are characterized in terms of their sensitivity and selectivity.