Complex of Co(III) as Receptor Molecule for Development of a New Perchlorate-Selective Polymeric Membrane Electrode

Abstract

A bis(dimethylgolyoximato)nitritopyridineCo(III), [Co(DMG) 2PyNO₂] incorporated in a plasticized poly (vinyl chloride) membrane was used to develop a perchlorate-selective electrode.The influence of membrane composition on the electrode response was studied. The electrode exhibits a nernstian response over the perchlorate concentration range 1.0 × 10^-6 to 1 × 10^-1 mol L^-1 with a slope of 41.36 mV per decade of concentration, a detection limit of 7.8 × 10^-7, a wide working pH range (3-10) and fast response time (< 10 s). The proposed electrode was used for the determination of perchlorate in water, wastewater and human urine with satisfactory results.