Potentiometric Utility of the New Solid-State Sensor Based on Crowned Ionophore for the Determination of K+


Kemer B., Ozdemir M.

TURKISH JOURNAL OF CHEMISTRY, cilt.32, ss.521-528, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 32 Konu: 5
  • Basım Tarihi: 2008
  • Dergi Adı: TURKISH JOURNAL OF CHEMISTRY
  • Sayfa Sayıları: ss.521-528

Özet

All solid-state contact poly vinyl chloride (PVC) membrane potassium-selective electrode has been developed. The construction of the ion selective electrode membrane was organized using ionophore 4,4'-bis[4"-phenoxy(15-crown-5) methyl] benzyl in PVC cocktail. The potentiometric performance characteristics of the electrode were investigated by a computerized system. The electrode was found highly selective to K+ ions over a wide variety of other cations. The electrode almost exhibited a Nernstian response (>= 55 (+/- 15) mV/decade of K activity) to K+ within the concentration range 1.5 x 10(-1)-1.0 x 10(-5) M. The operational pH range of the electrode was 5-7. The response time of the electrode was fast (< 10 s), and the life time was long (at least 2 months). The electrode has been successfully used in real sample analysis. The values obtained by the electrode were in good agreement with the certified values.