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Renewable Drops Electrochemical Sensor for Sulfide Ions Detection

✍ Scribed by M. R. Milani; N. R. Stradiotto; A. A. Cardoso

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
75 KB
Volume
15
Category
Article
ISSN
1040-0397

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✦ Synopsis

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^.

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