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The Electrochemical Analog of the Methylene Blue Reaction: A Novel Amperometric Approach to the Detection of Hydrogen Sulfide
Author(s) -
Lawrence Nathan S.,
Davis James,
Jiang Li,
Jones Tim G. J.,
Davies Steve N.,
Compton Richard G.
Publication year - 2000
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200012)12:18<1453::aid-elan1453>3.0.co;2-z
Subject(s) - amperometry , methylene blue , hydrogen sulfide , electrochemistry , chemistry , inorganic chemistry , sulfide , aqueous solution , electrode , glassy carbon , detection limit , organic chemistry , cyclic voltammetry , catalysis , chromatography , sulfur , photocatalysis
The electrochemical oxidation of N , N ‐dimethylphenylenediamine at glassy carbon electrodes in aqueous solution in the pH range 3–6 is shown to lead to currents which are considerably amplified in the presence of dissolved hydrogen sulfide. The mechanism of the electrode process is investigated and the reaction is shown to provide an attractive basis for the amperometric sensing of sulfide with an accessible range of ca. 3 to 150 μM (0.1 to 4.8 ppm).