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Response Behavior of Poly(vinyl chloride)‐ and Polyurethane‐Based Ca 2+ ‐Selective Membrane Electrodes with Polypyrrole‐ and Poly(3‐octylthiophene)‐Mediated Internal Solid Contact
Author(s) -
Sutter Jolanda,
Pretsch Ernö
Publication year - 2006
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.200503373
Subject(s) - polypyrrole , membrane , vinyl chloride , potentiometric titration , materials science , polyurethane , polymer chemistry , solvent , chemical engineering , electrode , polyvinyl chloride , polymerization , chemistry , composite material , copolymer , organic chemistry , polymer , biochemistry , engineering
The potentiometric response behavior of Ca 2+ ‐selective poly(vinyl chloride) (PVC) and polyurethane (PU) membranes with different inner contacts has been compared. Evidence for the formation of a water film between membrane and internal contact and, hence, a less than optimal lower detection limit have been found for membranes directly in contact with bare Au or with polypyrrole generated by electropolymerization in the presence of KCl. A significantly better behavior is shown by membranes with polypyrrole prepared in the presence of potassium hexacyanoferrate. Best performances have been obtained with solvent‐cast poly(3‐octylthiophene) as the internal contacting layer. As compared with the PVC membranes, those with PU had a significantly worse performance throughout.