期刊
TALANTA
卷 104, 期 -, 页码 162-168出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2012.11.036
关键词
Explosive sensor; In situ device; Disposable; Voltammetric; Flow injection analysis; Homeland security; Electrochemistry; Copper electrode
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2012/12106-5, 2011/11115-8, 2011/19903-5]
- Coordenacao de Aperfeicoa-mento de Pessoal de Nivel Superior (CAPES)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [470919/2011-6, 302700/2011-0]
A simple and fast electrochemical method for quantitative analysis of picric acid explosive (nitro-explosive) based on its electrochemical reduction at copper surfaces is reported. To achieve a higher sample throughput, the electrochemical sensor was adapted in a flow injection system. Under optimal experimental conditions, the peak current response increases linearly with picric acid concentration over the range of 20-300 mu mol L-1. The repeatability of the electrode response in the flow injection analysis (FIA) configuration was evaluated as 3% (n=10), and the detection limit of the method was estimated to be 6.0 mu mol L-1 (S/N=3). The sample throughput under optimised conditions was estimated to be 550 samples h(-1). Peroxide explosives like triacetone triperoxide (TATP) and hexamethylene triperoxide diamine (HMTD) were tested as potential interfering substances for the proposed method, and no significant interference by these explosives was noticed. The proposed method has interesting analytical parameters, environmental applications, and low cost compared with other electroanalytical methods that have been reported for the quantification of picric acid. Additionally, the possibility to develop an in situ device for the detection of picric acid using a disposable sensor was evaluated. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.
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