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Cation determination in aqueous solution using the methyl viologen‐doped zeolite‐modified carbon paste electrode
Author(s) -
Walcarius A.,
Lumberts L.,
Derouane E. G.
Publication year - 1995
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.1140070205
Subject(s) - amperometry , chemistry , electrolyte , inorganic chemistry , carbon paste electrode , aqueous solution , zeolite , electrode , flow injection analysis , electrochemistry , supporting electrolyte , alkali metal , analytical chemistry (journal) , cyclic voltammetry , detection limit , chromatography , catalysis , organic chemistry
Methyl viologen (MV 2+ ) initially exchanged in a zeolite Y modified carbon paste electrode (ZMCPE) is reduced after being exchanged for the supporting electrolyte cation. The use of an electrolyte cation that cannot enter zeolite channels to a great extent does not give rise to appreciable currents while a non‐size‐excluded cation allows liberating MV 2+ from zeolite particles and their subsequent reduction at the electrode–solution interface. Following those observations, the MV 2+ ‐based ZMCPE has been used for the constant potential (−0.85 V) amperometric detection of nonreducible:, non‐size‐excluded cations in aqueous medium. The performance of this electrode was investigated in both batch injection analysis (BIA) and flow injection analysis (FIA). The great advantage of BIA coupled to the amperometric detection is the ability to use electrolyte‐free sample solutions. For FIA experiments, dissolved oxygen was eliminated by using an electrochemical scrubber containing porous carbon electrodes. With the MV 2+ ‐doped ZMCPE, alkali and alkali‐metal cations can be detected at the submillimolar level for both batch and flow injection analysis.