Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/196116
Type: Artigo de periódico
Title: Voltammetric Determination Of 4-nitrophenol At A Lithium Tetracyanoethylenide (litcne) Modified Glassy Carbon Electrode.
Author: de Cássia Silva Luz, Rita
Damos, Flavio Santos
de Oliveira, Adriano Bof
Beck, Johannes
Kubota, Lauro Tatsuo
Abstract: The reduction of 4-nitrophenol (4-NP) has been carried out on a modified glassy carbon electrode using cyclic and differential pulse voltammetry (DPV). The sensor was prepared by modifying the electrode with lithium tetracyanoethylenide (LiTCNE) and poly-l-lysine (PLL) film. With this modified electrode 4-NP was reduced at -0.7V versus SCE. The sensor presented better performance in 0.1moll(-1) acetate buffer at pH4.0. The other experimental parameters, such as concentration of LiTCNE and PLL, pulse amplitude and scan rate were optimized. Under optimized operational conditions, a linear response range from 27 up to 23200nmoll(-1) was obtained with a sensitivity of 3.057nAlnmol(-1)cm(-2). The detection limit for 4-NP determination was 7.5nmoll(-1). The proposed sensor presented good repeatability, evaluated in term of relative standard deviation (R.S.D.=4.4%) for n=10 and was applied for 4-NP determination in water samples. The average recovery for these samples was 103.0 (+/- 0.7)%.
Rights: fechado
Identifier DOI: 10.1016/j.talanta.2004.04.010
Address: http://www.ncbi.nlm.nih.gov/pubmed/18969693
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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