Integrated explosive preconcentrator and electrochemical detection system for 2,4,6-trinitrotoluene (TNT) vapor

被引：51

作者：

Cizek, Karel ^{[1
]}

Prior, Chad ^{[1
]}

Thammakhet, Chongdee ^{[2
]}

Galik, Michal ^{[1
]}

Linker, Kevin ^{[3
]}

Tsui, Ray ^{[4
]}

Cagan, Avi ^{[5
,6
,7
]}

Wake, John ^{[5
,6
,7
]}

La Belle, Jeff ^{[5
,6
,7
]}

Wang, Joseph ^{[1
]}

机构：

[1] Univ Calif San Diego, Dept Nanoengn, La Jolla, CA 92093 USA

[2] Prince Songkla Univ, Dept Chem, Hat Yai 90112, Songkhla, Thailand

[3] Sandia Natl Labs, Albuquerque, NM 87185 USA

[4] Motorola Inc, Appl Res & Technol Ctr, Tempe, AZ 85284 USA

[5] Arizona State Univ, Biodesign Inst, Tempe, AZ 85287 USA

[6] Arizona State Univ, Dept Chem Engn, Tempe, AZ 85287 USA

[7] Arizona State Univ, Dept Chem, Tempe, AZ 85287 USA

来源：

ANALYTICA CHIMICA ACTA | 2010年 / 661卷 / 01期

关键词：

Trinitrotoluene; Vapor detection; Screen-printed electrodes; Explosive detection; NATURAL-WATERS; SENSOR;

D O I：

10.1016/j.aca.2009.12.008

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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 measurement produced a linear signal dependence on TNT quantity exposed to the preconcentrator from 0.25 to 10 mu g. Finally, the integrated device was Successfully demonstrated using a sample of solid TNT located upstream of the preconcentrator. (C) 2009 Elsevier B.V. All rights reserved

引用

页码：117 / 121

页数：5

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