Friday , 2 December 2022

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

Armila Rajbhandari*, Krishna Manandhar, Raja Ram Pradhananga
Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal

Mixed silver sulphide-silver chloride solid state ion selective electrode (ISE) with four different mole ratios of Ag2S: AgCl: 9:1, 2:1, 1:1 and 1:9 have been fabricated and characterized. The membrane material was obtained by co-precipitation of silver sulphide and silver chloride from aqueous solution. The material was characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM). X-ray diffraction study showed the presence of Ag2S and AgCl in separate crystalline phase. The electrode surface of these electrodes is found to become smoother and lustrous with increasing percentage of silver sulphide in the mixture. The ISE’s 2:1 and 1:1 in presence of  Cl- ions showed Nernstian response  with slopes of about 56 mV per decade change in chloride ion concentration in linear range of 1×10-1 M to 1×10-5 M while ISE 9:1 and 1:9 showed Nernstian behavior only upto 1×10-4M range. The response of these ISE’s were found to be very fast.
Key words: Chloride selective electrode, Nernstian Response 

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