期刊
ELECTROANALYSIS
卷 18, 期 1, 页码 19-25出版社
WILEY-BLACKWELL
DOI: 10.1002/elan.200503373
关键词
ion-selective electrode; solid contact; conducting polymers; lower detection limit
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.
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