Chromium(III)-selective Electrode Using p-(4-Acetanilidazo)calix[4]arene as an Ionophore in PVC Matrix

摘要

A new polyvinyl chloride)membrane,containing synthesized beta-(4-acetanilidazo)calix[4]arene as a membrane carrier,was used to fabricate a chromium(III)selective electrode.The optimum composition of the best performing membrane contained p-(4-acetanilidazo)calix[4]arene:DBBP:NaTPB:PVC in the ratio 10:100:1:100 w/w.This electrode exhibited a near Nernstian slope of 19.8 ± 0.2 mV/decade of activity in the working concentration range of 9.8 X 10~(-7)-1.0 X 10~(-1)M.It displayed a stable potential response in the pH range 2.8-5.7.The electrode exhibited a fast response time of less than 14 s and could be used for at least 12 weeks without any considerable divergence in potentials.This electrode showed very good selectivity over most of the common cations including Li~+,K~+,Na~+,Ni~(2+),Co~(2+),Cu~(2+),Sr~(2+),Ba~(2+),Cs~+,Pb~(2+),Zn~(2+),Mg~(2+),Cd~(2+),Al~(3+),Fe~(3+),and La~(3+).It could be employed successfully for the determination of Cr(III)ion activity in real samples.