TY - JOUR
T1 - Integrated explosive preconcentrator and electrochemical detection system for 2,4,6-trinitrotoluene (TNT) vapor
AU - Cizek, Karel
AU - Prior, Chad
AU - Thammakhet, Chongdee
AU - Galik, Michal
AU - Linker, Kevin
AU - Tsui, Ray
AU - Cagan, Avi
AU - Wake, John
AU - LaBelle, Jeffrey
AU - Wang, Joseph
N1 - Funding Information:
This research is supported by the National Consortium for MASINT Research, a Division of the Intelligence Community's National MASINT Management Office. The support of Motorola, Inc. is also acknowledged. Thanks also to Prof. William Trogler for providing the solid TNT sample used in this study.
PY - 2010/2/19
Y1 - 2010/2/19
N2 - 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 °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 μg. Finally, the integrated device was successfully demonstrated using a sample of solid TNT located upstream of the preconcentrator.
AB - 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 °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 μg. Finally, the integrated device was successfully demonstrated using a sample of solid TNT located upstream of the preconcentrator.
KW - Explosive detection
KW - Screen-printed electrodes
KW - Trinitrotoluene
KW - Vapor detection
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U2 - 10.1016/j.aca.2009.12.008
DO - 10.1016/j.aca.2009.12.008
M3 - Article
C2 - 20113724
AN - SCOPUS:74549194169
SN - 0003-2670
VL - 661
SP - 117
EP - 121
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
IS - 1
ER -