Development of a pH sensing membrane electrode based on a new calix[4]arene derivative

KORMALI ERTÜRÜN H. E., DEMİREL ÖZEL A., Sayin S., YILMAZ M., Kilic E.

TALANTA, cilt.132, ss.669-675, 2015 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 132
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.talanta.2014.10.032
  • Dergi Adı: TALANTA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.669-675
  • Anahtar Kelimeler: Calix[4]arene, pH sensing PVC membrane electrode, Potentiometry, pH measurement, Titratable acidity, ION-SELECTIVE ELECTRODE, POLY(VINYL CHLORIDE) MEMBRANE, NEUTRAL-CARRIER, POTENTIOMETRIC SENSOR, BEHAVIOR, RESPONSES, IONOPHORE, ISES
  • Ankara Üniversitesi Adresli: Evet

Özet

A new pH sensing poly(vinyl chloride) (PVC) membrane electrode was developed by using recently synthesized 5,17-bis(4-benzylpiperidine-1-yl)methyl-25.26,27,28-tetrahydroxy calix[4]arene as an ionophore. The effects of membrane composition, inner filling solution and conditioning solution on the potential response of the proposed pH sensing membrane electrode were investigated. An optimum membrane composition of 3% ionophore, 67% o-nitrophenyl octyl ether (o-NPOE) as plasticizer, 30% PVC was found. The electrode exhibited a near-Nernstian slope of 58.7 +/- 1.1 mV pH(-1) in the pH range 1.9-12.7 at 20 +/- 1 degrees C. It showed good selectivity for H+ ions in the presence of some cations and anions and a longer lifetime of at least 12 months when compared with the other PVC membrane pH electrodes reported in the literature. Having a wide working pH range, it was not only applied as a potentiometric indicator electrode in various acid-base titrations, but also successfully employed in different real samples. It has good reproducibility and repeatability with a response time of 6-7 s. Compared to traditional glass pH electrode, it exhibited excellent potentiometric response after being used in fluoride-containing media. (C) 2014 Elsevier B.V. All rights reserved.