Abstract
A recently synthesized 23-member macrocyclic diamide was used as a membrane-active component to prepare a new Cu2+-selective polymeric membrane electrode. The electrode exhibits a Nernstian response for copper(II) ions over a wide concentration range (1.0 × 10−1 to 3.2 × 10−5 M), with a limit of detection of 1.2 × 10−5 M (0.77 ppm). It has a response time <20 s and can be used for at least 3 months without any considerable divergence in potentials. The proposed membrane sensor revealed very good selectivities for Cu2+ over a wide variety of other metal ions and could be used in the pH range 3.5–6.0. It was used as an indicator electrode in potentiometric titration of copper ions with EDTA.
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