Open AccessThiocyanate Ion-Selective PVC Membrane Electrode
Author(s) -
Revenco Mihail,
Mariana Martin,
Waell A.A. Dayyih
Publication year - 2010
Publication title -
chemistry journal of moldova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.275
H-Index - 5
eISSN - 2345-1688
pISSN - 1857-1727
DOI - 10.19261/cjm.2010.05(1).05
Subject(s) - potentiometric titration , chemistry , ionophore , thiocyanate , ion selective electrode , electrode , inorganic chemistry , selectivity , membrane , detection limit , titration , electrode potential , potentiometric sensor , analytical chemistry (journal) , ion , chromatography , electrochemistry , organic chemistry , biochemistry , catalysis
A potentiometric selective sensor based on trinuclear chromium(III) complex as a novel ionophore for the thiocyanateselective electrode is reported. The sensor displays a near Nernstian slope of 57 ± 2 mV per decade, over a wide pH range 3 - 11. The working concentration range of the electrode is 1.10-5 – 1.10-1 mol/l with a detection limit of 5.10-6 mol/l. The sensor has a response time of 20 s and can be used for at least 6 months without any considerable fluctuation of the potential. The selectivity coefficients determined at using the fixed interference method indicate a good discriminating ability towards other anions. The prepared sensor was applied as an indicator electrode in the titration of thiocyanate with Ag+.
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