| Literature DB >> 20113724 |
Karel Cizek1, Chad Prior, Chongdee Thammakhet, Michal Galik, Kevin Linker, Ray Tsui, Avi Cagan, John Wake, Jeff La Belle, Joseph Wang.
Abstract
This article reports on an integrated explosive-preconcentration/electrochemical detection system for 2,4,6-trinitrotoluene (TNT) vapor. The challenges involved in such system integration are discussed. A hydrogel-coated screen-printed electrode is used for the detection of the thermally desorbed TNT from a preconcentration device using rapid square wave voltammetry. Optimization of the preconcentration system for desorption of TNT and subsequent electrochemical detection was conducted yielding a desorption temperature of 120 degrees C under a flow rate of 500 mL min(-1). Such conditions resulted in a characteristic electrochemical signal for TNT representing the multi-step reduction process. Quantitative measurements produced a linear signal dependence on TNT quantity exposed to the preconcentrator from 0.25 to 10 microg. Finally, the integrated device was successfully demonstrated using a sample of solid TNT located upstream of the preconcentrator. Copyright 2009 Elsevier B.V. All rights reserved.Entities:
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Year: 2009 PMID： 20113724 DOI： 10.1016/j.aca.2009.12.008
Source DB: PubMed Journal: Anal Chim Acta ISSN： 0003-2670 Impact factor: 6.558