The behaviour of the silver sulphide precipitate-based ion-selective electrode in the low concentration range

1984 ◽  
Vol 161 ◽  
pp. 333-341 ◽  
Author(s):  
E.G. Harsányi ◽  
K. Tóth ◽  
E. Pungor
Keyword(s):  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Low Concentration ◽  
Silver Sulphide

scholarly journals Characterization and Applications of Silver Sulphide Based Membrane Electrodes

1970 ◽  
Vol 7 (7) ◽  
pp. 19-23 ◽  
Author(s):  
A Rajbhandari ◽  
AP Yadav ◽  
K Manandhar ◽  
RR Pradhananga
Keyword(s):  
Silver Chloride ◽  
Silver Halide ◽  
Ion Selective Electrode ◽  
Ion Selective Electrodes ◽  
Powder Materials ◽  
Membrane Electrodes ◽  
Selective Electrode ◽  
Sulphide Ions ◽  
Silver Sulphide

The polycrystalline materials obtained by co-precipitation of silver sulphide and appropriate silver halide are used to prepare silver sulphide based membrane electrodes selective to the silver, chloride, bromide, iodide, and sulphide ions. The powder materials are characterized by x-ray diffraction, SEM equipped with EDAX. These membrane electrodes are found to give Nernstian response with the appropriate ions in the concentration range from 1x10-1 to 1x10-5 M. The performance of these home made electrodes is at par with the commercial electrodes. The electrodes have been successfully used for the quantitative determination of chloride, bromide iodide, silver, and sulphide ions and also for the determination of thiamine in pharmaceutical preparations. For developing countries like Nepal, who can not afford to procure high cost commercial ion selective electrodes, these home made ion selective electrodes are especially appealing since the electrode can be fabricated with ease in low cost and the electrode is well behaved and sufficiently accurate for the analysis with ion selective electrodes. Key words: Ion selective electrode; Home made ion selective electrode; Silver sulphide; Thiamine; Vitamin B1. DOI: 10.3126/sw.v7i7.3818 Scientific World Vol.7(7) 2009 pp.19-23  

Fabrication and Applications of Silver Sulphide Based Ion Sensors

2010 ◽  
Vol 117 ◽  
pp. 7-14
Author(s):  
Raja Ram Pradhananga ◽  
A. Nyachhyon ◽  
A.P. Yadav ◽  
Lok Kumar Shrestha ◽  
S. Tandukar
Keyword(s):  
Cigarette Smoke ◽  
Hydrogen Sulphide ◽  
Electrochemical Techniques ◽  
Ion Selective Electrode ◽  
Ion Concentration ◽  
Ion Selective Electrodes ◽  
Selective Electrode ◽  
Ion Sensors ◽  
Silver Sulphide

An electrochemical sensor based on the silver sulphide precipitate was fabricated in the laboratory and characterized by x-ray diffraction, SEM equipped with EDAX, and electrochemical techniques. Ion selective electrode (ISE) was found to be sensitive enough to sense the sulphide ion concentration from 10-1 to 10-5 M in alkaline medium. The change in electrode potential per decade change in sulphide ion concentration was found to be 31.5 mV at laboratory temperature indicating adherence of the ion selective electrode to Nernst’s equation. The sensor have been successfully used for the quantitative determination of thiamine in pharmaceutical preparations, hydrogen sulphide in cigarette smoke and determination of solubility products of sparingly soluble silver salts. A trace amount of hydrogen sulphide, a toxic gas, is present in the cigarette smoke. The quantitative estimation of hydrogen sulphide in cigarette smoke is a challenging task to analytical chemist. Hydrogen sulphide in cigarette smoke had been determined by absorbing the cigarette smoke in 0.1 M sodium hydroxide and the resulting solution was analyzed using silver sulphide based ion sensor by standard addition technique using modified Gran plot. The average amounts of hydrogen sulphide produced by a stick of cigarette in 8 different brands of Nepalese cigarette ware found to range from 0.0332 mg to 0.0766 mg. The sensitivity and reliability of these home made ion sensors were excellent and in par with commercial electrodes. For developing countries like Nepal, who can not afford to procure high cost commercial ion selective electrodes, these home made ion sensors are especially appealing since the sensor can be fabricated with ease from the materials that are readily available in the chemistry laboratory and the sensor is quite sensitive and gives reproducible results which are sufficiently accurate for the analysis with ion selective electrodes.

scholarly journals Electrochemical Characterization of Laboratory Fabricated Bromide Ion Selective Electrode

2016 ◽  
Vol 21 (1) ◽  
pp. 76-81 ◽  
Author(s):  
Armila Rajbhandari Nyachhyon ◽  
Krishna Manandhar ◽  
Raja Ram Pradhananga
Keyword(s):  
Electrochemical Impedance ◽  
Selectivity Coefficient ◽  
Electrode System ◽  
Ion Selective Electrode ◽  
Ion Concentration ◽  
Selective Electrode ◽  
Potentiometric Response ◽  
Bromide Ion ◽  
Silver Sulphide ◽  
Co Precipitation

Bromide ion selective electrode (Br-ISE) have been successfully fabricated in the laboratory. The polycrystalline Ag2S-AgBr membrane material of Br-ISE was prepared by co-precipitation of silver sulphide and silver bromide from aqueous solution and was characterized by X-ray diffractometry (XRD). XRD results showed that material is in mixed phase state having Ag3SBr, Ag2S and AgBr. Scanning electron microscopy (SEM) has been used to study the texture of the surface. The potentiometric response has been investigated by 2 electrode system whereas 3 electrode systems have been used for electrochemical impedance spectroscopy (EIS). The electrode was found to behave well up to the bromide concentration of 1x10-5M with a Nernstian slope of 58 mV per decade change in bromide ion concentration. The selectivity coefficient of electrode containing bromide ion in the presence of I- and Cl- ions was found to be 3.98 and 8x10-2, respectively indicating that I- and Cl- ions interfere in the response of bromide electrode to bromide ion. The EIS studies shows that the charge transfer process is the key mechanism that is going on at the electrode/ electrolyte interface and electrode/ back contact interface.Journal of Institute of Science and TechnologyVol. 21, No. 1, 2016, page: 76-81

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