A SILVER/SILVER SULPHIDE SELECTIVE ELECTRODE PREPARED BY MEANS OF CHEMICAL TREATMENT OF SILVER WIRE
D.Dobènik, I.Gros and M.Kolar Faculty of Chemistry and Chemical Engineering, University of Maribor, Slovenia
The preparation and usability of a sulphide ion selective electrode, prepared by means of chemical pretreatment of silver wire with an ammonium perdisulphate solution, and the sulphidization in an alkaline sulphide solution are described. The electrode is suitable for direct potentiometric measuring of sulphide in alkaline solutions of concentrations down to 1 x 10-6 mol/L. The 45 min required for each chemical treatment are enough for the preparation of the described electrode.