Doehlert matrix for optimisation of procedure for determination of nickel in saline oil-refinery effluents by use of flame atomic absorption spectrometry after preconcentration by cloud-point extraction

Detalhes bibliográficos
Autor(a) principal: Bezerra, Marcos de Almeida
Data de Publicação: 2004
Outros Autores: Conceição, André L. B., Ferreira, Sergio Luis Costa
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/8130
Resumo: Texto completo: acesso restrito. p. 798-803
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spelling Bezerra, Marcos de AlmeidaConceição, André L. B.Ferreira, Sergio Luis CostaBezerra, Marcos de AlmeidaConceição, André L. B.Ferreira, Sergio Luis Costa2013-01-24T19:48:59Z20041618-2642http://www.repositorio.ufba.br/ri/handle/ri/8130v. 378, n. 3Texto completo: acesso restrito. p. 798-803This paper proposes a preconcentration procedure for determination of nickel in saline aqueous waste samples by flame atomic absorption spectrometry (FAAS).It is based on cloud-point extraction of nickel(II) ions as 2-(5-bromo-2-pyridylazo)-5 diethilaminophenol (Br-PADAP) complexes using octylphenoxypolyethoxyethanol (Triton X-114) as surfactant. The optimisation step was performed using a four-variable Doehlert design, involving the factors centrifugation time (CT) of system after addition of surfactant, solution pH, methanol volume (MV) added at micellar phase, and buffer concentration (BC). The analytical response used was absorbance, after volume correction. Using the established experimental conditions in the optimisation step the procedure enables nickel determination with a detection limit (3δ/S) of 0.2 μgL–1, quantification limit (10δ/S) of 0.7 μgL–1, and precision, calculated as relative standard deviation (RSD) of 4.7 (n=8) and 3.5% (n=8) for nickel concentration of 1 and 5 μgL–1, respectively. The preconcentration factor, determined from the ratio of the slopes of the analytical curves with and without preconcentration, is 74. The recovery achieved for nickel determination in the presence of several cations demonstrated that this procedure could be applied for analysis of water samples. The robustness was checked by using saturated fractional factorial designs, centred on the established experimental conditions in the optimisation step. The results of these tests demonstrated that the variables centrifugation time and buffer concentration are robust for modification by 10% and that solution pH and methanol volume are robust for 5%. Accuracy was evaluated by using the certified material reference SLEW-3 estuarine water for trace metals. The procedure was used for determination of nickel in saline effluents from oil refinery samples. Recovery results (95–104%) indicate that the procedure has satisfactory accuracy for nickel determination in these samples.Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2013-01-24T19:48:59Z No. of bitstreams: 1 art%3A10.1007%2Fs00216-003-2349-4.pdf: 255360 bytes, checksum: 574a45dd0e846191e6eaf4ef908f6ecd (MD5)Made available in DSpace on 2013-01-24T19:48:59Z (GMT). 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dc.title.pt_BR.fl_str_mv Doehlert matrix for optimisation of procedure for determination of nickel in saline oil-refinery effluents by use of flame atomic absorption spectrometry after preconcentration by cloud-point extraction
dc.title.alternative.pt_BR.fl_str_mv Analytical and Bioanalytical Chemistry
title Doehlert matrix for optimisation of procedure for determination of nickel in saline oil-refinery effluents by use of flame atomic absorption spectrometry after preconcentration by cloud-point extraction
spellingShingle Doehlert matrix for optimisation of procedure for determination of nickel in saline oil-refinery effluents by use of flame atomic absorption spectrometry after preconcentration by cloud-point extraction
Bezerra, Marcos de Almeida
Oil-refinery waste
Saline effluents
Doehlert matrix
Flame atomic absorption spectrometry
Cloud-point extraction
Nickel
title_short Doehlert matrix for optimisation of procedure for determination of nickel in saline oil-refinery effluents by use of flame atomic absorption spectrometry after preconcentration by cloud-point extraction
title_full Doehlert matrix for optimisation of procedure for determination of nickel in saline oil-refinery effluents by use of flame atomic absorption spectrometry after preconcentration by cloud-point extraction
title_fullStr Doehlert matrix for optimisation of procedure for determination of nickel in saline oil-refinery effluents by use of flame atomic absorption spectrometry after preconcentration by cloud-point extraction
title_full_unstemmed Doehlert matrix for optimisation of procedure for determination of nickel in saline oil-refinery effluents by use of flame atomic absorption spectrometry after preconcentration by cloud-point extraction
title_sort Doehlert matrix for optimisation of procedure for determination of nickel in saline oil-refinery effluents by use of flame atomic absorption spectrometry after preconcentration by cloud-point extraction
author Bezerra, Marcos de Almeida
author_facet Bezerra, Marcos de Almeida
Conceição, André L. B.
Ferreira, Sergio Luis Costa
author_role author
author2 Conceição, André L. B.
Ferreira, Sergio Luis Costa
author2_role author
author
dc.contributor.author.fl_str_mv Bezerra, Marcos de Almeida
Conceição, André L. B.
Ferreira, Sergio Luis Costa
Bezerra, Marcos de Almeida
Conceição, André L. B.
Ferreira, Sergio Luis Costa
dc.subject.por.fl_str_mv Oil-refinery waste
Saline effluents
Doehlert matrix
Flame atomic absorption spectrometry
Cloud-point extraction
Nickel
topic Oil-refinery waste
Saline effluents
Doehlert matrix
Flame atomic absorption spectrometry
Cloud-point extraction
Nickel
description Texto completo: acesso restrito. p. 798-803
publishDate 2004
dc.date.issued.fl_str_mv 2004
dc.date.accessioned.fl_str_mv 2013-01-24T19:48:59Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/8130
dc.identifier.issn.none.fl_str_mv 1618-2642
dc.identifier.number.pt_BR.fl_str_mv v. 378, n. 3
identifier_str_mv 1618-2642
v. 378, n. 3
url http://www.repositorio.ufba.br/ri/handle/ri/8130
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.pt_BR.fl_str_mv http://link.springer.com/article/10.1007%2Fs00216-003-2349-4
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