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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.)

Nanoporous Gold Microelectrode: A Novel Sensing Platform for Highly Sensitive and Selective Determination of Arsenic (III) using Anodic Stripping Voltammetry

Texto completo
Autor(es):
Orellana Jaramillo, Dario Xavier [1, 2] ; Sukeri, Anandhakumar [1] ; Saravia, Lucas P. H. [1] ; Espinoza-Montero, Patricio Javier [2] ; Bertotti, Mauro [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Av Prof Lineu Prestes 748, Sao Paulo, SP - Brazil
[2] Escuela Politecn Nacl Ladron Guevara E11 253, Ctr Invest & Control Ambiental, Dept Ingn Civil & Ambiental, POB 17-01-2759, Quito - Ecuador
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Electroanalysis; v. 29, n. 10, p. 2316-2322, OCT 2017.
Citações Web of Science: 9
Resumo

A home-made gold microelectrode (Au-E) was fabricated and its surface was modified with nanoporous gold structures via a facile electrochemical approach (anodization followed by electrochemical reduction method). The fabricated nanoporous Au microelectrode (NPG-E) was used as a sensor probe for the determination of As(III) in 1.0 mol L-1 HCl solution using square wave anodic stripping voltammetry (SWASV) technique. Field emission scanning electron microscopy (FE-SEM) and cyclic voltammetry were used to characterize the surface morphology and assess the electrochemical surface area and the roughness factor of the NPG-mu E. SWASVs recorded with the NPG-E in As(III) solutions indicated linear behaviour in the concentration ranges of 10-200 mu g L-1 and 2-30 mu g L-1, with regression coefficients of 0.996 and 0.999 at a deposition time of 120s, respectively. The limit of detection (LOD) was found to be 0.62 mu g L-1 with high sensitivity of 29.75 mu A (mu gL(-1))(-1) cm(-2). Repeatability and reproducibility were also examined and values were determined as 3.2% and 9.0%. Negligible interference from major interfering copper ion was noticed, revealing the excellent anti-interference property of the proposed sensing platform. The developed NPG-mu E was successfully used for As(III) determination in tap water samples. (AU)

Processo FAPESP: 14/15215-5 - Fabricação e caracterização de nanoeletrodos para uso em microscopia eletroquímica: aplicações analíticas e de caráter fundamental
Beneficiário:Sukeri Anandhakumar
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 15/20776-9 - Fabricação de sondas com dimensões nanométricas para o estudo de processos bioquímicos usando microscopia eletroquímica
Beneficiário:Mauro Bertotti
Linha de fomento: Auxílio à Pesquisa - Regular