ABSTRACT
An ion-selective membrane electrode based on 4,13-didecyl-1,7,10,16-tetraoxa-4,13-diazacyclooctadecane (Kryptofix 22DD) incorporated into a polyvinyl chloride (PVC) membrane has been constructed. The electrode was prepared by a membrane containing dibutylphetalate (DBP) as plasticiser, Kryptofix 22DD as an ionophore, graphite powder as an additive and PVC as a matrix. Under the optimised membrane composition, the constructed electrochemical sensor shows the best response characteristics with a Nernstian behaviour over the concentration range of 1.0 × 10−4–1.0 × 10−1 mol L−1 of solution, with a detection limit of 1.20 × 10−5 mol L−1. The electrode is applicable in the pH range of 1.5–4. It has a fast response time of about 10 s and can be used for at least 12 weeks without any considerable spellcheck in its potential response. The fabricated electrode reveals a good selectivity towards the ion in the presence of several cations in solution and also, it could be applied for determination of this ion in real samples.
Acknowledgement
The authors gratefully acknowledge the support of this work by Ferdowsi University of Mashhad, Mashhad, Iran (Grant No. 3/33748).
Disclosure statement
No potential conflict of interest was reported by the authors.