CATALYTIC POTENTIOMETRIC TITRATION OF SIL VER(I) BY THE APPLICATION OF IODIDE-CATALYZED MANGANESE(III)-ARSENIC(III) INDICATOR REACTION IN THE PRESENCE OF SULFURIC-ACID

A new potentiometric titration method was developed for the determinat ion of silver(I) by the application of the iodide-catalysed manganese( III)-arsenic(III) indicator reaction in the presence of sulphuric acid . The effects of the concentrations of sulphuric acid and some anions, of the manganese(III) to manganese(II) and manganese(III) to arsenic( III) molar ratios in the titrated solution, as well as the effect of t he titrand temperature on the conditions of the determination in solut ions of various silver(I) concentrations, were investigated. The error in the determination of 1 mu g/cm(3) silver was less than 2 %, and th e reproducibility of the method is good.