Highly selective and sensitive sensor based on 4,13-didecyl-1,7,10,16-tetraoxa-4,13-diazacyclooctadecane as a heterocyclic ionophore

Document Type: Original Paper

Authors

Department of Chemistry, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

Abstract

A new polyvinyl choloride (PVC) membrane sensor for cerium (III) was
prepared based on 4,13-didecyl-1,7,10,16-tetraoxa-4,13-diazacyclooctadecane
(kryptofix22DD) as an ionophore. The sensor exhibites a linear concentration
range of 1.0×10
-6
to 1.0×10
-1
M, with a Nernstian slope of 18.0±1.0 mV/decade,
and a detection limit of 9.7×10
-7
M. It has a fast response time (5 s) and can be
used for two months without any considerable divergence in its potential. The
proposed sensor revealed high selectivity toward Ce
3+
ion with respect to some
alkali, alkaline earth and transition metal cations. It could be used in a wide pH
range of 2.0-11.0. The sensor was successfully used as an indicator electrode
in potentiometric titration of Ce
3+
ion with ethylenediaminetetraacetic acid
(EDTA) and sodium iodide (NaI) solutions, and in determination of Ce (III)
concentration in real samples.

Keywords


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