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Liquid state membrane electrode sensitive to Ln(III)

Authors
Journal
Talanta
0039-9140
Publisher
Elsevier
Publication Date
Volume
41
Issue
8
Identifiers
DOI: 10.1016/0039-9140(93)e0002-u

Abstract

Abstract A liquid ion-exchange electrode containing a chloroform solution of the complex of Ln(III) (Gd, La) with tetraphenyl ester of imidodiphosphoric acid is described. The slope of the calibration graph (electrode potential vs concentration) is 18.5 mV/pLn in the pLn range 4.7-2 (pH = 5). Fe(III), Al(III), Co(II), Ni(II) and Ca(II) ions do not interfere, unlike ions of other lanthanides. It was found that the electrode might be applied to detect the end point of the titration of Ln 3+ ions.

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