Abstract

Aim: A novel all solid-state contact PVC-membrane beryllium-selective electrode based on 4-hydroxybenzo-15-crown-5 ether as an ionophore is described.

Results: The best performance was obtained with a membrane composition of 4% ionophore, 67% dioctyl sebacate (DOS), 28% poly(vinyl chloride) (PVC), and 1% potassium tetrakis (p-chloro)phenylborate (KTClPB) (w/w). The all solid-state contact PVCmembrane beryllium-selective electrode together with an Ag/AgCl reference electrode exhibited sub-Nernstian response with a slope of 22±1 mV/decade to beryllium ions from 1.0x10-6 to 1.0x10-1 M, and resulted a considerably low detection limit of 6.2x10 7. The electrode had a good performance in selectivity over a wide range of interfering cations tested. It showed a working pH range between 4.0-8.2 with fast response time (<10 s) and a good reproducibility.

Conclusion: The all solid-state contact PVC-membrane beryllium-selective electrode developed was successfully applied in potentiometric titration of Be2+ ions with EDTA.

Keywords: Beryllium-selective electrode, 4-hydroxybenzo-15-crown-5 ether, potentiometry, PVC membrane, ionophore, EDTA.

Graphical Abstract