Abstract:

Salicylaldehyde-1,2-phenylenediamine(SPS) was synthesized by the reaction of salicylaldehyde with phenylenediamine. A copper(Ⅱ) ionic selective electrode with a sensitive membrane consisted of carbon paste and neutral SPS carrier was fabricated with liquid paraffin as the binder. The Cu(Ⅱ) selective electrode was deployed to determine the concentration of SCN- anion and exhibited a Nernstian response to SCN- ions over a range of 1.0×10-6~1.0×10-2 mol/L, with a regression equation of E(mV)=-51.19 lgcSCN--853.75(r=0.9997) and a detection limit of 4.0×10-7 mol/L. The response time of the electrode is less than 30 s. The electrode also shows a high selectivity, good stability and durability. The electrode has been successfully applied in determing the concentrations of SCN- in waste water samples.

Key words: SCN-, ion-selective electrode, salicylaldehyde-phenylendiamine