PVC-Based Hexathia-18-crown-6-tetraone Sensor for Mercury(II) Ions

Abstract

A PVC membrane sensor for mercury(II) ions based on hexathia-18-crown-6-tetraone as membrane carrier was prepared. The sensor exhibits a Nernstian response for Hg2+ ions over a wide concentration range (1.0 × 10-3−4.0 × 10-6 M). It has a relatively fast response time and can be used for at least 3 months without any considerable divergence in potentials. The proposed sensor revealed very good selectivities for Hg2+ over a wide variety of other metal ions and could be used in a pH range of 0.5−2.0. It was used as an indicator electrode in potentiometric titration of mercury ions.