Potentiometric Sensor for Determination of Sulfate Ions based on 2-Amino-6-(tbutyl)-4-(pyridin-2-yl)pyrimidine) (dichlorido)palladium(II)

A novel PVC-based membrane sensor based on 2-Amino-6-(tbutyl)-4-(pyridin-2-yl)pyrimidine)(dichlorido)palladium(II) (ATPP) for determination of trace amounts of sulfate ions is introduced. The electrode revealed Nernstian response towards sulfate over the wide concentration range from 5.0×10?1 to 4.0×10?7 M at the pH range of 2.9-9.5. The effect of solvent mediator, cationic additives and amount of ion-carrier on the behavior of the sensor was investigated. The sensor shows a short response time ( < 25s) in the whole concentration ranges. The detection limit of the electrode was 1.8×10?7 M and it could be used for 20 weeks without any measurable changes in the slope. The proposed electrode shows very good selectivity for sulfate ions over a wide variety of common inorganic and organic anions. It was successfully used as an indicator electrode for titration of sulfate ions with barium ions. The electrode was also applied for determination of salbutamol sulfate and paramomycine sulfate