Potentiometric monitoring of cobalt in beer sample by solid contact ion selective electrode

Eren H., Uzun H., Andaç M., Bilir S.

JOURNAL OF FOOD AND DRUG ANALYSIS, cilt.22, sa.4, ss.413-417, 2014 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 22 Sayı: 4
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1016/j.jfda.2014.03.003
  • Dergi Adı: JOURNAL OF FOOD AND DRUG ANALYSIS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.413-417
  • Anahtar Kelimeler: Beer, Cobalt, Polyvinyl chloride (PVC) membrane, Potentiometry, Solid contact, STABILITY, SENSORS
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

A new solid contact cobalt selective electrode was constructed with 4-tert-butylthiacalix[4] arene as ionophore. The best performance was observed with the membrane having an ionophore/polyvinyl chloride/sodium tetraphenylborate/nitrophenyl octyl ether ratio of 3.5:33:1.5:62 (w/w; mg). The electrode, under steady-state conditions, exhibited a working concentration range of 1 x 10(-1) - 1 x 10(-6) mol/L with a near-Nernstian slope of 25.3 mV/decade and a detection limit of 3.5 x 10(-7) mol/L. The electrode had a very short response time (<10 seconds) and good reproducibility at a working pH range of 4.0-6.5. The electrode was used for 4 months without any significant change in its sensitivity. The potentiometric performance of the electrode in partially nonaqueous medium [up to 20 % (v/v) alcohol] was found satisfactory. The performance of the prepared electrode for the analysis of beer samples using direct potentiometric method is very encouraging. Copyright (C) 2014, Food and Drug Administration, Taiwan. Published by Elsevier Taiwan LLC. All rights reserved.