Analytical application of poly(vinyl chloride-co-vinyl acetate) electrode modified with silver for chloride ions determination in real systems

Abstract

Application possibility of new simple Ag-selective electrode for the determination of chloride ions, was investigated in this paper. The poly(vinyl chloride-co-vinyl acetate) electrode modified with silver (PVCAc/Ag) was prepared by simple immersion a glassy carbon rod coated with poly(vinyl chloride-co- vinyl acetate) polymer, which contained plasticizer and lipophilic additive, but without ionophore, into the silver nitrate solution. This simplicity of construction and extensive pH range through remarkable acidic media (pH 0.7 to 7.0), are the advantages of this modified electrode over many of reported silver selective electrodes based on a polymer matrix containing different ionophores. The response of the electrode was linear with a Nernstian slope of 60.25 mV/decade in the concentration range from 1.0×10-1 to 1.0×10-5 mol/dm3 Ag+ and with a detection limit of 4.25×10-6 mol/dm3. Proposed PVCAc/Ag electrode was applied to the determination of chloride ions in the samples spring waters. The results of chloride ion determination in samples spring waters obtained by proposing electrode and comparative Ag/AgCl electrode were in satisfactory agreement.