Application of Doehlert designs for optimisation of an on-line preconcentration system for copper determination by flame atomic absorption spectrometry

Detalhes bibliográficos
Autor(a) principal: Ferreira, Sergio Luis Costa
Data de Publicação: 2003
Outros Autores: Bezerra, Marcos de Almeida, Santos, Walter Nei Lopes dos, Barros Neto, Benício de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://repositorio.ufba.br/ri/handle/ri/14064
Resumo: Texto completo: acesso restrito. p. 295–303
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spelling Ferreira, Sergio Luis CostaBezerra, Marcos de AlmeidaSantos, Walter Nei Lopes dosBarros Neto, Benício deFerreira, Sergio Luis CostaBezerra, Marcos de AlmeidaSantos, Walter Nei Lopes dosBarros Neto, Benício de2013-12-10T11:35:34Z20030039-9140http://repositorio.ufba.br/ri/handle/ri/14064v. 61, n. 3Texto completo: acesso restrito. p. 295–303In the present paper, a system for on-line preconcentration and determination of copper by flame atomic absorption spectrometry (FAAS) was developed. It was based on solid phase extraction of copper(II) ions on a minicolumn of Amberlite XAD-2 loaded with 2-(2-thiazolylazo)-5-dimethylaminophenol (TAM). The optimisation process was carried out using Doehlert designs. Four variables (sampling flow rate, SR; elution flow rate, buffer concentration, BC; and pH) were regarded as factors in the optimisation. The parameter “sensitivity efficiency (SE)” proposed in this paper, and defined as the analytical signal obtained for an on-line enrichment system for a preconcentration time of 1 min was used as analytical response in the optimisation process. Using the established experimental conditions, the proposed on-line system allowed determination of copper with detection limit (3σ/S) of 0.23 μg l−1, and a precision (repeatability), calculated as relative standard deviation (R.S.D.) of 3.9 and 3.7% for copper concentration of 5.00 and 20.00 μg l−1, respectively. The preconcentration factor obtained is 62. The recovery achieved for copper determination in presence of several cations demonstrated that this has enough selectivity for analysis of food samples. The robustness of the proposed system was also evaluated. The accuracy was confirmed by analysis of the following certified reference materials (CRMs): Rice flour NIES 10a, Spinach leaves NIST 1570a, Apples leaves NIST 1515 and Orchard leaves NBS 1571. This procedure was applied for copper determination in natural food samples.Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2013-12-10T11:35:33Z No. of bitstreams: 1 Sérgio L.C. Ferreira.pdf: 314669 bytes, checksum: 41a7bc7b9ac1e63b67a71182e8a31135 (MD5)Made available in DSpace on 2013-12-10T11:35:34Z (GMT). No. of bitstreams: 1 Sérgio L.C. Ferreira.pdf: 314669 bytes, checksum: 41a7bc7b9ac1e63b67a71182e8a31135 (MD5) Previous issue date: 2003http://dx.doi.org.ez10.periodicos.capes.gov.br/10.1016/S0039-9140(03)00277-7reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBADoehlert designsCopperFlame atomic absorption spectrometryApplication of Doehlert designs for optimisation of an on-line preconcentration system for copper determination by flame atomic absorption spectrometryTalantainfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10000-01-01info:eu-repo/semantics/openAccessengORIGINALSérgio L.C. Ferreira.pdfSérgio L.C. Ferreira.pdfapplication/pdf314669https://repositorio.ufba.br/bitstream/ri/14064/1/S%c3%a9rgio%20L.C.%20Ferreira.pdf41a7bc7b9ac1e63b67a71182e8a31135MD51LICENSElicense.txtlicense.txttext/plain1345https://repositorio.ufba.br/bitstream/ri/14064/2/license.txtff6eaa8b858ea317fded99f125f5fcd0MD52TEXTSérgio L.C. Ferreira.pdf.txtSérgio L.C. 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dc.title.pt_BR.fl_str_mv Application of Doehlert designs for optimisation of an on-line preconcentration system for copper determination by flame atomic absorption spectrometry
dc.title.alternative.pt_BR.fl_str_mv Talanta
title Application of Doehlert designs for optimisation of an on-line preconcentration system for copper determination by flame atomic absorption spectrometry
spellingShingle Application of Doehlert designs for optimisation of an on-line preconcentration system for copper determination by flame atomic absorption spectrometry
Ferreira, Sergio Luis Costa
Doehlert designs
Copper
Flame atomic absorption spectrometry
title_short Application of Doehlert designs for optimisation of an on-line preconcentration system for copper determination by flame atomic absorption spectrometry
title_full Application of Doehlert designs for optimisation of an on-line preconcentration system for copper determination by flame atomic absorption spectrometry
title_fullStr Application of Doehlert designs for optimisation of an on-line preconcentration system for copper determination by flame atomic absorption spectrometry
title_full_unstemmed Application of Doehlert designs for optimisation of an on-line preconcentration system for copper determination by flame atomic absorption spectrometry
title_sort Application of Doehlert designs for optimisation of an on-line preconcentration system for copper determination by flame atomic absorption spectrometry
author Ferreira, Sergio Luis Costa
author_facet Ferreira, Sergio Luis Costa
Bezerra, Marcos de Almeida
Santos, Walter Nei Lopes dos
Barros Neto, Benício de
author_role author
author2 Bezerra, Marcos de Almeida
Santos, Walter Nei Lopes dos
Barros Neto, Benício de
author2_role author
author
author
dc.contributor.author.fl_str_mv Ferreira, Sergio Luis Costa
Bezerra, Marcos de Almeida
Santos, Walter Nei Lopes dos
Barros Neto, Benício de
Ferreira, Sergio Luis Costa
Bezerra, Marcos de Almeida
Santos, Walter Nei Lopes dos
Barros Neto, Benício de
dc.subject.por.fl_str_mv Doehlert designs
Copper
Flame atomic absorption spectrometry
topic Doehlert designs
Copper
Flame atomic absorption spectrometry
description Texto completo: acesso restrito. p. 295–303
publishDate 2003
dc.date.issued.fl_str_mv 2003
dc.date.accessioned.fl_str_mv 2013-12-10T11:35:34Z
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://repositorio.ufba.br/ri/handle/ri/14064
dc.identifier.issn.none.fl_str_mv 0039-9140
dc.identifier.number.pt_BR.fl_str_mv v. 61, n. 3
identifier_str_mv 0039-9140
v. 61, n. 3
url http://repositorio.ufba.br/ri/handle/ri/14064
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://dx.doi.org.ez10.periodicos.capes.gov.br/10.1016/S0039-9140(03)00277-7
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reponame_str Repositório Institucional da UFBA
collection Repositório Institucional da UFBA
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