Ibrahim Isildak*, Azade Attar, Ersin Demir, Baris Kemer and Hassan Y. Aboul-Enein* Pages 43 - 48 ( 6 )
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.
Beryllium-selective electrode, 4-hydroxybenzo-15-crown-5 ether, potentiometry, PVC membrane, ionophore, EDTA.
Yildiz Technical University, Faculty Chemistry & Metallurgical Engineering, Department of Bioengineering, Davutpasa Campus, 34210 Istanbul, Yildiz Technical University, Faculty Chemistry & Metallurgical Engineering, Department of Bioengineering, Davutpasa Campus, 34210 Istanbul, Okan University, Vocational School of Health Services, Perfusion Techniques, 34959, Istanbul, Karadeniz Technical University, Faculty of Science, Department of Chemistry, 61100, Trabzon, Pharmaceutical and Medicinal Chemistry Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki, Giza 12622