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Renewable Drops Electrochemical Sensor for Sulfide Ions Detection
Author(s) -
Milani M. R.,
Stradiotto N. R.,
Cardoso A. A.
Publication year - 2003
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.200390102
Subject(s) - ferricyanide , ferrocyanide , electrochemistry , detection limit , sulfide , inorganic chemistry , ion , analytical chemistry (journal) , electrochemical gas sensor , chemistry , materials science , electrode , chromatography , organic chemistry
Abstract The design and characteristics of a novel electrochemical system, which uses a drop as a renewable electroanalytical sensor, are described. This article describes the performance of the electrochemical system, the coupling of the experimental arrangement with flow injection technique and a demonstration of its applicability for the measurement of sulfide. The method is based on renewable drops of ferricyanide ions, buffered by borate. The ferrocyanide ions, product of the reaction between ferricyanide and sulfide ions, are oxidized on a platinum microelectrode and the current measured is related to sulfide concentration. The measurements can be done in continuous or static flow mode. In continuous mode, the detection limit is 5.0×10 −5 mol L −1 .