On the SCN--Ion Selective Electrode with Carrier of Complex of Unsymmetrical Schiff Base with Cu(Ⅱ)

By using the complex formed between unsymmetrical Schiff base and cupric ion as neutral carrier,an anion selective electrode was prepared. It was found that excellant selectivity and potential response toward SCN--ion were achieved by the anion selective electrode prepared by using the Cu2+-complex of a particular Schiff base (i.e.,salicylaldehyde-acetylacetone-ethylenediimine) as neutral carrier,which showed approximate Nernst potential response in the range of 7.5×10-5 to 1.0×10-1mol·L-1 with detection limit (3S/N) of 6.5×10-6mol·L-1,and slope of -53.8 mV·dec-1 in a PBS of pH 5.0 at 25 ℃. The selectivity of the electrode reaction between SCN--ion and the Cu2+ ion in the carrier complex was studied by UV-spectrophotometry and the mechanism of the potential response was studied by the AC impedance method. Recovery of the method was tested by standard addition method on the base of samples of waste water drained from chemical laboratory,results of recovery found were in the range of 95.3% to 107.9%.