Flow injection analysis of picric acid explosive using a copper electrode as electrochemical detector

Autor(es)

Junqueira, Joao R. C. ^[1] ; de Araujo, William R. ^[1] ; Salles, Maiara O. ^[1] ; Paixao, Thiago R. L. C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Talanta; v. 104, p. 162-168, JAN 30 2013.
• Citações Web of Science: 32

Resumo

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. (AU)

• Processo FAPESP: 11/11115-8 - Desenvolvimento de língua híbrida (eletroquímica e colorimétrica) visando à discriminação de amostras forenses.
• Beneficiário: Maiara Oliveira Salles
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/12106-5 - Utilização de medidas eletroquímicas, colorimétricas e de massa para discriminação de amostras de interesse forense e alimentício utilizando dispositivos inteligentes (línguas e narizes eletrônicos)
• Beneficiário: Thiago Regis Longo Cesar da Paixão
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/19903-5 - Desenvolvimento de métodos eletroanalíticos para detecção/discriminação de drogas de abuso, seus adulterantes e explosivos em amostras de interesse forense
• Beneficiário: William Reis de Araujo
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto