Please use this identifier to cite or link to this item: https://repositorio.ufba.br/handle/ri/7319
metadata.dc.type: Artigo de Periódico
Title: Use of factorial design and Doehlert matrix for multivariate optimisation of an on-line preconcentration system for lead determination by flame atomic absorption spectrometry
Other Titles: Analytical and Bioanalytical Chemistry
Authors: Ferreira, Sergio Luis Costa
Santos, Walter Nei Lopes dos
Bezerra, Marcos de Almeida
Lemos, Valfredo Azevedo
Bosque-Sendra, Juan Manuel
metadata.dc.creator: Ferreira, Sergio Luis Costa
Santos, Walter Nei Lopes dos
Bezerra, Marcos de Almeida
Lemos, Valfredo Azevedo
Bosque-Sendra, Juan Manuel
Abstract: A system for on-line preconcentration and determination of lead by flame atomic absorption spectrometry (FAAS) was proposed. It was based on the sorption of lead(II) ions on a minicolumn of polyurethane foam loaded with 2-(2-thiazolylazo)-5 dimethylaminophenol (TAM). The optimisation step was carried out using twolevel full factorial and Doehlert designs for the determination of the optimum conditions for lead preconcentration. The proposed procedure allowed the determination of lead with a detection limit of 2.2 μgL–1, and a precision, calculated as relative standard deviation (RSD), of 2.4 and 6.8 for a lead concentration of 50.0 and 10.0 μgL–1, respectively. A preconcentration factor of 45 and a sampling frequency of 27 samples per hour were obtained. The recovery achieved for lead determination in the presence of several cations demonstrated that this procedure has enough selectivity for analysis of environmental samples. The validation was carried out by analysis of certified reference material. This procedure was applied to lead determination in natural food.
Keywords: Lead determination
Doehlert matrix
On-line preconcentration
Polyurethane foam
FAAS
URI: http://www.repositorio.ufba.br/ri/handle/ri/7319
Issue Date: 2003
Appears in Collections:Artigo Publicado em Periódico (Química)

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