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Highly Thiocyanate‐Selective PVC Membrane Electrode Based on Lipophilic Ferrocene Derivative
Author(s) -
Dai Jianyuan,
Yuan Ruo,
Chai Yaqin,
An Lanxiang,
Zhong Xia,
Liu Yan,
Tang Dianping
Publication year - 2005
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200503313
Subject(s) - thiocyanate , potentiometric titration , chemistry , cationic polymerization , electrode , inorganic chemistry , selectivity , ferrocene , detection limit , membrane , ion selective electrode , ion , electrochemistry , chromatography , polymer chemistry , organic chemistry , biochemistry , catalysis
A novel anion‐selective PVC membrane electrode based on bis‐[(3‐ferrocenyl)‐(2‐crotonic acid)] copper(II) complex [Cu(II)‐BFCA] as neutral carrier is described, which demonstrates excellent potentiometric response characteristics toward thiocyanate ion and anti‐Hofmeister selectivity sequence in following order: SCN − >I − >ClO $\rm{ {_{4}^{-}}}$ >Sal − >Br − >NO $\rm{ {_{3}^{-}}}$ >Cl − ≈NO $\rm{ {_{2}^{-}}}$ >SO $\rm{ {_{3}^{2-}}}$ >SO $\rm{ {_{4}^{2-}}}$ . The electrode shows a near‐Nernstian response for thiocyanate ion in a wide range of 9.0×10 −7 –1.0×10 −1 M with a detection limit 6.8×10 −7 M and a slope of −59.1 mV/decade in pH 5.0 of phosphate buffer solution at 20 °C. The influences of lipophilic cationic and anionic additives on the response properties of the electrode were investigated. High sensitivity and wide linear dynamic range were observed for the electrode in the presence of hexadecyltrimethylammoniumborate (HTAB) as a lipophilic cationic additive. The electrode was successfully applied to the determination of thiocyanate ion in waste water and human saliva.