Abstract
A PVC membrane electrode for zinc ions based on cryptand C2B22 as membrane carrier was prepared. The electrode exhibits a linear stable response over a wide concentration range (5.0 × 10–2– 5.0 × 10–5 mol/L) with a slope of 24 mV/ decade and a limit of detection of 3.98 × 10–5 mol/L (2.6 μg/g). It has a fast response time of about 30 s and can be used for at least 4 months without any divergence in potential. The proposed sensor revealed good selectivities for Zn2+ over a wide variety of other metal ions and could be used in a pH range of 4–7. It was used as an indicator electrode in potentiometric titration of zinc ion.
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