Hydrogen ion-selective poly(vinyl chloride) membrane electrode based on a p-tert-butylcalix[4]arene-oxacrown-4


Demirel A., Dogan A., Canel E., Memon S., Yilmaz M., Kilic E.

TALANTA, vol.62, no.1, pp.123-129, 2004 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 62 Issue: 1
  • Publication Date: 2004
  • Doi Number: 10.1016/s0039-9140(03)00414-4
  • Journal Name: TALANTA
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.123-129
  • Keywords: p-tert-butylcalix[4]arene-oxacrown-4, hydrogen ion-selective, PVC membrane electrode, potentiometry, NEUTRAL CARRIER, SOLID CONTACT, PH ELECTRODE, PROTON CARRIER, PVC MEMBRANE, SENSOR, BEHAVIOR, RANGE, MICROELECTRODE, RESPONSES

Abstract

A hydrogen ion-selective poly(vinyl chloride) (PVC) membrane electrode was developed using p-tert-butylcalix[4]arene-oxacrown-4 as ionophore. Apart from the ionophore, plasticisers and lipophilic anions were blended, in various proportions, with PVC in tetrahydrofurane and n-fixtures so prepared were poured onto glass surfaces to form the membrane. 2-Nitrophenylpentylether has proved to be the best alternative as plasticiser and the lipophilic anions tried have turned out to have an adverse effect on the pH response. The electrode of the optimum characteristics had a composition of 2% p-tert-butylcalix[4]arene-oxacrown-4, 68.3% o-NPPE and 29.7% PVC. The electrode showed an apparent Nernstian response in the pH range 2-11 with a slope of 54.2 +/- 0.4 mV pH(- 1) at 20 +/- 1 degreesC. It has a rapid potential-response to changes of pH, high ion selectivity towards lithium, sodium and potassium, and other characteristics comparable to those reported for the conventional pH glass membrane electrode. It appears to be a suitable potentiometric indicator electrode specifically for hydrofluoric acid solutions. (C) 2003 Elsevier B.V. All rights reserved.