9- Novel Cu(II) selective PVC electrode based on 8,11,14-triaza-1,4-dioxo-5(6),16(17)-dibenzocycloseptadecane as an ionophore

Sulekh Chandra*, Dev Raj Singh and Himanshu Agarwal

Department of Chemistry, Zakir Husain College (University of Delhi) J.L. Nehru Marg, New Delhi-110002, India

*Corresponding author: schandra_00@yhoo.co;

ABSTRACT

A PVC membrane based copper (II) selective electrode was constructed using 8,11,14-triaza-1,4-dioxo,5(6),16(17)-dibenzocycloseptadecane (TADOBCSD) as a neutral carrier. The sensor exhibits a Nernstian response for Cu(II) ions over a wide concentration range of 1.0 × 10^-8 – 1.0 × 10^{-1 M with a slope of 29.45 ± 0.5 mV/decade, having detection limit of 8.0 × 10-7 M (36 ppb). It has a relatively fast response time (< 10 s for concentrations} ³ 1.0 × 10^{-3 M and < 15 s for concentration of} ³ 10^{-6 M) and can be used for 8 months without any considerable divergence in potentials. The proposed sensor revealed relatively good selectively and high sensitivity for Cu(II) over a bi-, tri- and tetravalent metal ions and could be used in a pH range of 3.5-8.0. It was successfully also used as an indicator electrode in potentiometer titration and in analysis of concentration of copper in various real samples.}

Keywords: Cu(II) electrode, PVC, Macrocyclic ligand, Potentiometry.

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