No abstract

No abstract

A new PVC membrane potentiometric sensor for Ag(I) ion based on a recently synthesized calix[4]arene compound of 5,11,17,23-tetra-tert-butyl-25,27-dihydroxy-calix[4]arene-thiacrown-4 is developed. The electrode exhibits a Nernstian response for Ag(I) ions over a wide concentration range (1.0 Â 10 À2 À 1.0 Â 10 À6 M) with a slope of 53.8 AE 1.6 mV per decade. It has a relatively fast response time (5 -10 s) and can be used for at least 2 months without any considerable divergence in potentials.