Selective Determination of Acetate Ion Using Nickel Complex of N,N'-biphenyl-2,2'-diylbis[1-(1H-pyrrol-2-yl) ethanimine] as an Ionophore

A new acetate selective poly (vinyl chloride) membrane sensor based on newly synthesized nickel complex of Schiff base, N,N'-benzene-1,2-diylbis[1-(1H-pyrrol-2- yl)ethanimine] as an ionophore was prepared. The electrode show Nernstian slope of 31.4±1 mV/decade with improved linear range of 1.6×10-7 to 1.0×10-2 M, with a lower detection limit of 1.0×10-7 M between pH range of 3.0-9.5, giving a relatively fast response within (5s) and can be used for at least 2 months without any divergence in potential. The selectivity coefficient was calculated using matched potential method. The proposed electrode was successfully applied as an indicator electrode for the titration of arsenate ion with sodium thiocynide. It was also be used for the determination of arsenate ion in different water samples.