A new PVC-membrane electrode for Ag + ion based on a thia-substituted macrocyclic diamide has been prepared. The electrode exhibited a Nernstian response for Ag + over a wide concentration range (1.7 × 10It has a response time <15 s and can be used for at least 3 months without divergence. The proposed membrane sensor revealed good selectivities for Ag + over a variety of metal ions and can be used in a pH range 3.0-7.5. It has been used successfully for direct determination of Ag + in different real samples and, as an indicator electrode, in the titration of silver ion.
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