Properties of Cadmium Ion-Selective Electrode Containing Chelating Agent in Polymeric Membrane

摘要

A new PVC membrane sensor for Cd~(2+)ions based on 2-(3',4'-dihydroxyphenylazo-1')-1,3,4 thiadiazole(TIDAP)as membrane carrier has been prepared.Its analytical characteristics,including the slope of the calibration plot,detection limit,lifetime,response time,selectivity for zinc,nickel,cobalt,calcium,mercury,copper,barium,magnesium,manganese,potassium and sodium ions,as well as the pH-dependence of the electrode potential have been established.The proposed sensor was successfully applied as an indicator electrode in potentiometric titration of cadmium ions.