Pre-concentration procedure for determination of copper and zinc in food samples by sequential multi-element flame atomic absorption spectrometry

Detalhes bibliográficos
Autor(a) principal: Ferreira, Hadla S.
Data de Publicação: 2008
Outros Autores: Santos, Ana C. N., Portugal, Lindomar Andrade, Costa, Antonio Celso Spinola, Miró, Manuel, 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/6018
Resumo: Acesso restrito: Texto completo. p. 73-76
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spelling Ferreira, Hadla S.Santos, Ana C. N.Portugal, Lindomar AndradeCosta, Antonio Celso SpinolaMiró, ManuelFerreira, Sergio Luis CostaFerreira, Hadla S.Santos, Ana C. N.Portugal, Lindomar AndradeCosta, Antonio Celso SpinolaMiró, ManuelFerreira, Sergio Luis Costa2012-05-31T13:14:36Z2008http://www.repositorio.ufba.br/ri/handle/ri/6018V. 77, n. 1Acesso restrito: Texto completo. p. 73-76In this paper is proposed a simultaneous pre-concentration procedure using cloud point extraction for the determination of copper and zinc in food samples employing sequential multi-element flame atomic absorption spectrometry (FS-FAAS). The reagent used is 1-(2-pyridylazo)-2-naphthol (PAN) and the micellar phase is obtained using the non-ionic surfactant octylphenoxypolyethoxyethanol (Triton X-114) and centrifugation. The optimization step was performed using Box–Behnken design for three factors: solution pH, reagent concentration and buffer concentration. A multiple response functionwas established in order to get an experimental condition for simultaneous extraction of copper and zinc. Under the optimized experimental conditions, the method allows the determination of copper with a limit of detection (3 b/S, LOD) of 0.1 gL−1, precision expressed as relative standard deviation (R.S.D.) of 2.1 and 1.3% (N= 10), for copper concentrations of 10 and 50 gL−1, respectively. Zinc is determined with a LOD of 0.15 gL−1 and precision as R.S.D. of 2.7 and 1.7% for concentrations of 10 and 50 gL−1,respectively. The enhancement factors obtained were 36 and 32 for copper and zinc, respectively. The accuracy was assessed by analysis of certified reference materials, namely, SRM 1567a – Wheat Flour and SRM 8433 – Corn Bran from National Institute of Standards & Technology and BCR 189-wholemeal flour from Institute of Reference Materials and Measurements. Themethodwas applied to the determination of copper and zinc in oats, powdered chocolate, corn flour and wheat flour samples. The copper content in the samples analyzed varied from1.14 to 3.28 gg−1 and zinc from 8.7 to 22.9 gg−1.Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2012-05-31T13:14:36Z No. of bitstreams: 1 __ac.els-cdn.com_S003991...463b428daf94510856811f5a42088.pdf: 94600 bytes, checksum: 9b1b4a49d7ac0e1b083962fd2be6f461 (MD5)Made available in DSpace on 2012-05-31T13:14:36Z (GMT). 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dc.title.pt_BR.fl_str_mv Pre-concentration procedure for determination of copper and zinc in food samples by sequential multi-element flame atomic absorption spectrometry
dc.title.alternative.pt_BR.fl_str_mv Talanta
title Pre-concentration procedure for determination of copper and zinc in food samples by sequential multi-element flame atomic absorption spectrometry
spellingShingle Pre-concentration procedure for determination of copper and zinc in food samples by sequential multi-element flame atomic absorption spectrometry
Ferreira, Hadla S.
Zinc
Copper
Food samples
Cloud point
Box–Behnken design
title_short Pre-concentration procedure for determination of copper and zinc in food samples by sequential multi-element flame atomic absorption spectrometry
title_full Pre-concentration procedure for determination of copper and zinc in food samples by sequential multi-element flame atomic absorption spectrometry
title_fullStr Pre-concentration procedure for determination of copper and zinc in food samples by sequential multi-element flame atomic absorption spectrometry
title_full_unstemmed Pre-concentration procedure for determination of copper and zinc in food samples by sequential multi-element flame atomic absorption spectrometry
title_sort Pre-concentration procedure for determination of copper and zinc in food samples by sequential multi-element flame atomic absorption spectrometry
author Ferreira, Hadla S.
author_facet Ferreira, Hadla S.
Santos, Ana C. N.
Portugal, Lindomar Andrade
Costa, Antonio Celso Spinola
Miró, Manuel
Ferreira, Sergio Luis Costa
author_role author
author2 Santos, Ana C. N.
Portugal, Lindomar Andrade
Costa, Antonio Celso Spinola
Miró, Manuel
Ferreira, Sergio Luis Costa
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Ferreira, Hadla S.
Santos, Ana C. N.
Portugal, Lindomar Andrade
Costa, Antonio Celso Spinola
Miró, Manuel
Ferreira, Sergio Luis Costa
Ferreira, Hadla S.
Santos, Ana C. N.
Portugal, Lindomar Andrade
Costa, Antonio Celso Spinola
Miró, Manuel
Ferreira, Sergio Luis Costa
dc.subject.por.fl_str_mv Zinc
Copper
Food samples
Cloud point
Box–Behnken design
topic Zinc
Copper
Food samples
Cloud point
Box–Behnken design
description Acesso restrito: Texto completo. p. 73-76
publishDate 2008
dc.date.issued.fl_str_mv 2008
dc.date.accessioned.fl_str_mv 2012-05-31T13:14:36Z
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/6018
dc.identifier.number.pt_BR.fl_str_mv V. 77, n. 1
url http://www.repositorio.ufba.br/ri/handle/ri/6018
identifier_str_mv V. 77, n. 1
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/10.1016/j.talanta.2008.05.056
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
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