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Application of Zeolite‐Polydimethylsiloxane Electrodes to Potentiometric Studies of Cationic Species
Author(s) -
Matysik Silke,
Matysik FrankMichael,
Mattusch Jürgen,
Einicke WolfDietrich
Publication year - 1998
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/(sici)1521-4109(199802)10:2<98::aid-elan98>3.0.co;2-n
Subject(s) - potentiometric titration , zeolite , polydimethylsiloxane , electrode , faujasite , alkali metal , inorganic chemistry , membrane , materials science , chemistry , detection limit , reference electrode , titration , analytical chemistry (journal) , chemical engineering , chromatography , electrochemistry , catalysis , nanotechnology , organic chemistry , biochemistry , engineering
Potentiometric electrodes based on the incorporation of zeolite particles into polydimethylsiloxane (PDMS) membranes are described. The electrode characteristics are evaluated regarding the response towards alkali metal cations. Zeolite/PDMS‐coated iridium disk electrodes offer lower limits of detection (3 × 10 −5 M for Cs + ) and a more extended concentration range with Nernstian slope than zeolite‐PDMS electrodes with inner reference solution. Both types of electrodes respond rapidly to concentration changes (within a few seconds or less). Zeolite‐PDMS electrodes exhibit almost the same sensitivity towards all alkali metal cations independent of the use of either zeolite X or zeolite A. Furthermore, zeolite‐PDMS electrodes are applied to the determination of ionic surfactants. In contrast to the results obtained for alkali metal cations zeolites of the faujasite type (X and Y) lead to superior electrode function when compared to A zeolites. The determination of surfactants is accomplished by potentiometric titration using a zeolite‐PDMS indicator electrode. Practical applications of surfactant determination in commercial detergents are presented and verified by performing the two‐phase titration as independent reference method.