Determination of fluorine in tea using highresolution molecular absorption spectrometry with electrothermal vaporization of the calcium monofluoride CaF

Detalhes bibliográficos
Autor(a) principal: Morés, Silvane
Data de Publicação: 2011
Outros Autores: Monteiro, Gustavo C., Santos, Flaviane da Silva, Carasek, Eduardo, Welz, Bernhard
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/5315
Resumo: texto completo: acesso restrito. p. 2681– 2685.
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spelling Morés, SilvaneMonteiro, Gustavo C.Santos, Flaviane da SilvaCarasek, EduardoWelz, BernhardMorés, SilvaneMonteiro, Gustavo C.Santos, Flaviane da SilvaCarasek, EduardoWelz, Bernhard2012-02-07T18:49:19Z20111873-3573http://www.repositorio.ufba.br/ri/handle/ri/5315v. 85.texto completo: acesso restrito. p. 2681– 2685.Highresolution continuum source molecular absorption of the calcium monofluoride molecule CaF in a graphite furnace has been used to determine fluorine in tea after acid digestion, alkaline solubilization and preparation of a conventional aqueous infusion. The strongest absorption ‘line’ of the CaF molecule is at 606.440 nm, which is part of the rotational fine structure of the X 26+ − A 25 electronic transition; it has a bond dissociation energy of 529 kJ mol−1, which is comparable with other molecules used for fluorine determination. One advantage of using Ca as the moleculeforming reagent is that spectral interferences are extremely unlikely in the spectral range of its strongest absorption. Another advantage is that Ca acts both as molecule forming reagent and chemical modifier, so that no other reagent has to be added, making the method very simple. The only disadvantage is that Ca has a somewhat negative influence on the graphite tube lifetime. The limit of detection was found to be 0.16 mg L−1 F, corresponding to 1.6 ng F absolute, and the calibration curve was linear in the range between 0.5 and 25 mg L−1 with a correlation coefficient of R = 0.9994. The results obtained for a certified tea reference material were in agreement with the certified value on a 95% confidence level. There was also no difference between the results obtained after an acid digestion and an alkaline solubilization for 10 tea samples, based on a paired ttest. The values found in the 10 samples ranged between 42 mg g−1 and 87 mg g−1 F; the tea infusions contained between 21 mg g−1 and 56 mg g−1 F, with an extraction rate between 48% and 74%.Submitted by Ana Valéria de Jesus Moura (anavaleria_131@hotmail.com) on 2012-02-07T18:49:19Z No. of bitstreams: 1 __pdn.sciencedirect.com_....0-S0039914011007636-main.pdf: 228442 bytes, checksum: 5115211d6b635c51dff98f018f273a32 (MD5)Made available in DSpace on 2012-02-07T18:49:19Z (GMT). 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dc.title.pt_BR.fl_str_mv Determination of fluorine in tea using highresolution molecular absorption spectrometry with electrothermal vaporization of the calcium monofluoride CaF
dc.title.alternative.pt_BR.fl_str_mv Talanta
title Determination of fluorine in tea using highresolution molecular absorption spectrometry with electrothermal vaporization of the calcium monofluoride CaF
spellingShingle Determination of fluorine in tea using highresolution molecular absorption spectrometry with electrothermal vaporization of the calcium monofluoride CaF
Morés, Silvane
molecular absorption spectrometry
Fluorine determination
Highresolution
continuum source
CaF molecular absorption
Electrothermal vaporization
Tea analysis
title_short Determination of fluorine in tea using highresolution molecular absorption spectrometry with electrothermal vaporization of the calcium monofluoride CaF
title_full Determination of fluorine in tea using highresolution molecular absorption spectrometry with electrothermal vaporization of the calcium monofluoride CaF
title_fullStr Determination of fluorine in tea using highresolution molecular absorption spectrometry with electrothermal vaporization of the calcium monofluoride CaF
title_full_unstemmed Determination of fluorine in tea using highresolution molecular absorption spectrometry with electrothermal vaporization of the calcium monofluoride CaF
title_sort Determination of fluorine in tea using highresolution molecular absorption spectrometry with electrothermal vaporization of the calcium monofluoride CaF
author Morés, Silvane
author_facet Morés, Silvane
Monteiro, Gustavo C.
Santos, Flaviane da Silva
Carasek, Eduardo
Welz, Bernhard
author_role author
author2 Monteiro, Gustavo C.
Santos, Flaviane da Silva
Carasek, Eduardo
Welz, Bernhard
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Morés, Silvane
Monteiro, Gustavo C.
Santos, Flaviane da Silva
Carasek, Eduardo
Welz, Bernhard
Morés, Silvane
Monteiro, Gustavo C.
Santos, Flaviane da Silva
Carasek, Eduardo
Welz, Bernhard
dc.subject.por.fl_str_mv molecular absorption spectrometry
Fluorine determination
Highresolution
continuum source
CaF molecular absorption
Electrothermal vaporization
Tea analysis
topic molecular absorption spectrometry
Fluorine determination
Highresolution
continuum source
CaF molecular absorption
Electrothermal vaporization
Tea analysis
description texto completo: acesso restrito. p. 2681– 2685.
publishDate 2011
dc.date.issued.fl_str_mv 2011
dc.date.accessioned.fl_str_mv 2012-02-07T18:49:19Z
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/5315
dc.identifier.issn.none.fl_str_mv 1873-3573
dc.identifier.number.pt_BR.fl_str_mv v. 85.
identifier_str_mv 1873-3573
v. 85.
url http://www.repositorio.ufba.br/ri/handle/ri/5315
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 doi:10.1016/j.talanta.2011.08.044
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
instname:Universidade Federal da Bahia (UFBA)
instacron:UFBA
instname_str Universidade Federal da Bahia (UFBA)
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