Hot-wire amperometric monitoring of flowing streams

This paper describes the design of a hot-wire electrochemical flow detector, and the advantages accrued from the effects of locally increased temperature, mainly thermally induced convection, upon the amperometric monitoring of flowing streams. A new hydrodynamic modulation voltammetric approach is...

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Bibliographic Details
Published in:Talanta (Oxford) 2000-01, Vol.50 (6), p.1205-1210
Main Authors: Wang, Joseph, Jasinski, Markus, Flechsig, Gerd-Uwe, Grundler, Peter, Tian, Baomin
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Electrochemical detection
Electrochemical methods
Exact sciences and technology
Flow analysis
General, instrumentation
Heat pulse
Hot wire electrochemistry
Hydrodynamic modulation
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Summary:This paper describes the design of a hot-wire electrochemical flow detector, and the advantages accrued from the effects of locally increased temperature, mainly thermally induced convection, upon the amperometric monitoring of flowing streams. A new hydrodynamic modulation voltammetric approach is presented, in which the solution flow rate remains constant while the temperature of the working electrode is modulated. Factors influencing the response, including the flow rate, temperature pulse, or applied potential, have been investigated. The hot-wire operation results also in a significant enhancement of the flow injection amperometric response. The minimal flow rate dependence observed with the heated electrode should benefit the on-line monitoring of streams with fluctuated natural convection, as well as various in-situ remote sensing applications.
ISSN:0039-9140
1873-3573
DOI:10.1016/S0039-9140(99)00224-6