An uranyl solid state PVC membrane potentiometric sensor based on 4,13-didecyl-1,7,10,16-tetraoxa-4,13- diazacyclooctadecane and its application for environmental samples

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.

KEYWORDS:

• UO₂²⁺ ion
• Kryptofix 22DD
• ion-selective electrode
• potentiometry

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.

Additional information

Funding

This work was supported by the Ferdowsi University of Mashhad: [3/33748].