Abstract
In order to determine directly ▪ contained as impurities in sodium sulphide (Na 2S) by isotachophoresis, an investigation was made of the electrolyte system, the stability of the standard ▪ solution and the denaturation of the Na 2S solution under different conditions of pH, temperature, concentration and dissolved oxygen content. The electrolyte system was a water-acetone (1:1) solution of 5 · 10 −3 M hydrochloric acid-1 · 10 −2 M l-histidine as the leading electrolyte and a 0.01 M solution of sodium acetate as the terminating electrolyte, which were found to give the best results. For the solvent for the standard solution of sulphur oxoacids and the Na 2S solution, a 5% aqueous solution of glycerine prepared with water that had been degassed by boiling was found to be satisfactory. The detection limit for ▪ in the direct analysis of an aqueous solution of Na 2S was 0.015%. The analysis time was about 15 min.
Published Version
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