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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Direct nitrate sensing in water using an array of copper-microelectrodes from flat flexible cables

Texto completo
Autor(es):
da Silva, Iranaldo S. [1, 2] ; de Araujo, William R. [1] ; Paixao, Thiago R. L. C. [1] ; Angnes, Lucio [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo - Brazil
[2] Co Saneamento Ambiental Maranhao, BR-65020906 Sao Luis, MA - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: SENSORS AND ACTUATORS B-CHEMICAL; v. 188, p. 94-98, NOV 2013.
Citações Web of Science: 18
Resumo

Nitrate determination plays a very important role in the analysis of environmental samples. In this paper, an activation procedure for nitrate sensing using a modified copper electrode made from flat flexible cables in presence of a low amount of chloride is reported. The proposed method exhibits enhanced electrocatalytic behaviour in the reduction of nitrate compared to a bare copper electrode. The proposed method showed linear response for nitrate in the concentration range 10-1070 mu mol L-1, with a regression coefficient R-2=0.999 (n=12) and a limit of detection of 1.8 mu mol L-1. According to the procedure based on the standard addition technique, the recovery values obtained were 93-103%, showing the accuracy of the proposed method. In addition, the proposed sensor was applied to the determination of nitrate in mineral water samples and the results are in good agreement (for a 95% confidence level according to the Student's t-test) with those obtained using the capillary electrophoresis procedure. (C) 2013 Elsevier B.V. All rights reserved. (AU)

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
Linha de fomento: Auxílio à Pesquisa - Regular