Analytical Sciences

Selenite-Selective Membrane Electrodes Based on IonExchangers and Application to Anodic Slime

Guller EKMEKCI and Guller SOMER

Gazi Universitesi, Fen-Edebiyat Fakultesi, Kimya Bolumn, 06500 Ankara, Turkey

A new membrane selenite selective electrode has been developed. The electrode consisted of 4% ion exchanger, QAD 86PI (dialkyldimethylammonium chloride), as the active material, and 96% SR as the membrane matrix. An analyticallyuseful potential change occurs from 10^-6 - 10^-1 M selenite ion. The slope of the linear portion is 19 mV/10 fold change inselenite concentration. No interference was observed for SO₄^2- , SO₃^2- , S^2- , HPO₄^2- , Cl^- , Br^- and I^- ions. The lifetime ofthe electrode was about three months. This electrode has been used for the determination of selenium in anodic slime atpH 8 (ammonia buffer) using standard addition method.

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