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Amperometric Detection of Sulfide: An Electrocatalytic Reaction with Ferrocene Carboxylate
Author(s) -
Lawrence Nathan S.
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.200603578
Subject(s) - sulfide , ferrocene , amperometry , chemistry , detection limit , inorganic chemistry , cyclic voltammetry , carboxylate , electrochemistry , electrode , organic chemistry , chromatography
The electrocatalytic oxidation of sulfide and sulfhydryl thiol species by ferrocene carboxylate at both glassy carbon and boron doped diamond electrodes is examined. The enhancement in the oxidative current recorded in the presence of sulfide, allowed linear ranges up to 1 mM for sulfide detection to be achieved. In the absence of the mediator, no defined oxidation wave was observed for the direct oxidation of sulfide. Furthermore, the use of hydrodynamic voltammetry produced a limit of detection of 2 μM. The procedure was applied to the recovery of a sulfide spike in river water, with a recovery of 104% obtained.