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Potentiometric Membrane Electrode for Cr(III) Ion Based on a New Aryl Amide Bifunctional Bridging Ligand as a Neutral Carrier
Author(s) -
Ma YuHua,
Yuan Ruo,
Chai YaQin,
Liu XinLu
Publication year - 2009
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200900101
Subject(s) - potentiometric titration , chemistry , bifunctional , electrode , inorganic chemistry , ion selective electrode , membrane , detection limit , analytical chemistry (journal) , titration , ionophore , amide , selectivity , chromatography , organic chemistry , biochemistry , catalysis
A novel Cr(III) ion‐selective electrode is constructed by incorporating a new aryl amide bifunctional bridging ligand, 2,2′‐bis{[(2″‐benzylaminoformyl)phenxoyl]methyl}‐diethylether (BBPMD) as a neutral carrier into the PVC matrix. The proposed electrode, with optimum membrane composition, exhibits an excellent near‐Nernstian response for Cr 3+ ion ranging from 2.8 × 10 −6 to 1.0 × 10 −1 mol/L with a detection limit of 8.6 × 10 −7 mol/L and a slope of 19.5 ± 0.2 mV/dec in pH 3.0 nitrate buffer solution at 25 °C. It has an appropriate response time, suitable reproducibility, and good selectivity towards Cr 3+ ion. The operational pH range of the proposed electrode is 2.5–6.5. The response mechanism was discussed in view of UV‐vis spectroscopy and the A. C. impedance technique. The excellent analytical features of the proposed electrode could lead to its successful application as an indicator electrode in potentiometric titration of Cr 3+ ion and in the direct determination of Cr 3+ ion in tea leaves and coffee samples.