PVC-based dicyclohexano-18-crown-6 sensor for La(III) ions

Susheel K Mittal; S K Ashok Kumar; Harish Kumar Sharma

doi:10.1016/j.talanta.2003.10.001

PVC-based dicyclohexano-18-crown-6 sensor for La(III) ions

Talanta. 2004 Mar 10;62(4):801-5. doi: 10.1016/j.talanta.2003.10.001.

Authors

Susheel K Mittal¹, S K Ashok Kumar, Harish Kumar Sharma

Affiliation

¹ School of Chemistry and Biochemistry, Thapar Institute of Engineering and Technology (Deemed University), Patiala 147004, India.

PMID: 18969365
DOI: 10.1016/j.talanta.2003.10.001

Abstract

A new ion-selective electrode (ISE) based on dicyclohexano-18-crown-6 (DC18C6) as a neutral carrier is developed for lanthanum(III) ions. The electrode comprises of dicyclohexano-18-crown-6 (6%), PVC (33%), and ortho-nitrophenyl octyl ether (o-NPOE) (61%). The electrode shows a linear dynamic response in the concentration range of 10(-6) to 10(-1)M with a Nernstian slope of 19mV per decade and a detection limit as 5x10(-7)M. It has a response time of <30s and can be used for at least 5 months without any significant divergence in potentials. The selectivity coefficients for mono-, di-, and trivalent cations indicate good selectivity for La(III) ions over a large number of interfering cations. The sensor has been used as an indicator electrode in the potentiometric titrations of La(III) with EDTA. The membrane is successfully applied in partially non-aqueous medium. It can be used in the pH range 4-9.