Comparison of direct solid sampling and slurry sampling for the determination of cadmium in wheat flour by electrothermal atomic absorption spectrometry

Detalhes bibliográficos
Autor(a) principal: Araujo, Rennan Geovanny Oliveira
Data de Publicação: 2008
Outros Autores: Oleszczuk, Nédio, Rampazzo, Roger T., Costa, Pedro A., Silva, Márcia M., Vale, Maria Goreti R., Welz, Bernhard, 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/6022
Resumo: Acesso restrito: Texto completo. p. 400-406
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spelling Araujo, Rennan Geovanny OliveiraOleszczuk, NédioRampazzo, Roger T.Costa, Pedro A.Silva, Márcia M.Vale, Maria Goreti R.Welz, BernhardFerreira, Sergio Luis CostaAraujo, Rennan Geovanny OliveiraOleszczuk, NédioRampazzo, Roger T.Costa, Pedro A.Silva, Márcia M.Vale, Maria Goreti R.Welz, BernhardFerreira, Sergio Luis Costa2012-05-31T13:56:39Z20080039-9140http://www.repositorio.ufba.br/ri/handle/ri/6022v. 77, n. 1Acesso restrito: Texto completo. p. 400-406Two analytical methods for the determination of cadmium in wheat flour by electrothermal atomic absorption spectrometry without prior sample digestion have been compared: direct solid sampling analysis (SS) and slurry sampling (SlS). Besides the conventional modifier mixture of palladium and magnesium nitrates (10 g Pd+3 g Mg), 0.05% (v/v) Triton X-100 has been added to improve the penetration of the modifier solution into the solid sample, and 0.1% H2O2 in order to promote an in situ digestion for SS. For SlS, 30 g Pd, 12 gMg and 0.05% (v/v) Triton X-100 have been used as the modifier mixture. Under these conditions, and using a pyrolysis temperature of 800 ◦C, essentially no background absorption was observed with an atomization temperature of 1600 ◦C. About 2mg of sample have been typically used for SS, although as much as 3–5mg could have been introduced. In the case of SlS multiple injections had to be used to achieve the sensitivity required for this determination. Calibration against aqueous standards was feasible for bothmethods. The characteristic mass obtained with SSwas 0.6 pg, and that with SlSwas 1.0 pg. The limits of detection were 0.4 and 0.7 ng g−1, the limits of quantification were 1.3 and 2.3 ng g−1 and the relative standard deviation (n = 5) was 6–16% and 9–23% for SS and SlS, respectively. The accuracy was confirmed by the analysis of certified reference materials. The two methods were applied for the determination of cadmium in six wheat flour samples acquired in supermarkets of different Brazilian cities. The cadmium content varied between 8.9±0.5 and 13±2ngg−1 (n = 5). Direct SS gave results similar to those obtained with SlS using multi-injections; the values of both techniques showed no statistically significant difference at the 95% confidence level. Direct SS was finally adopted as the method of choice, due to its greater simplicity, the faster speed of analysis and the better figures of merit.Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2012-05-31T13:56:39Z No. of bitstreams: 1 __ac.els-cdn.com_S003991...5e6b58e18de33fe00075ff4758e94.pdf: 208416 bytes, checksum: 72e381f8b054617c2705c85ebc232f54 (MD5)Made available in DSpace on 2012-05-31T13:56:39Z (GMT). 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dc.title.pt_BR.fl_str_mv Comparison of direct solid sampling and slurry sampling for the determination of cadmium in wheat flour by electrothermal atomic absorption spectrometry
dc.title.alternative.pt_BR.fl_str_mv Talanta
title Comparison of direct solid sampling and slurry sampling for the determination of cadmium in wheat flour by electrothermal atomic absorption spectrometry
spellingShingle Comparison of direct solid sampling and slurry sampling for the determination of cadmium in wheat flour by electrothermal atomic absorption spectrometry
Araujo, Rennan Geovanny Oliveira
Cadmium
Wheat flour
Slurry sampling
Solid sampling
ET AAS
title_short Comparison of direct solid sampling and slurry sampling for the determination of cadmium in wheat flour by electrothermal atomic absorption spectrometry
title_full Comparison of direct solid sampling and slurry sampling for the determination of cadmium in wheat flour by electrothermal atomic absorption spectrometry
title_fullStr Comparison of direct solid sampling and slurry sampling for the determination of cadmium in wheat flour by electrothermal atomic absorption spectrometry
title_full_unstemmed Comparison of direct solid sampling and slurry sampling for the determination of cadmium in wheat flour by electrothermal atomic absorption spectrometry
title_sort Comparison of direct solid sampling and slurry sampling for the determination of cadmium in wheat flour by electrothermal atomic absorption spectrometry
author Araujo, Rennan Geovanny Oliveira
author_facet Araujo, Rennan Geovanny Oliveira
Oleszczuk, Nédio
Rampazzo, Roger T.
Costa, Pedro A.
Silva, Márcia M.
Vale, Maria Goreti R.
Welz, Bernhard
Ferreira, Sergio Luis Costa
author_role author
author2 Oleszczuk, Nédio
Rampazzo, Roger T.
Costa, Pedro A.
Silva, Márcia M.
Vale, Maria Goreti R.
Welz, Bernhard
Ferreira, Sergio Luis Costa
author2_role author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Araujo, Rennan Geovanny Oliveira
Oleszczuk, Nédio
Rampazzo, Roger T.
Costa, Pedro A.
Silva, Márcia M.
Vale, Maria Goreti R.
Welz, Bernhard
Ferreira, Sergio Luis Costa
Araujo, Rennan Geovanny Oliveira
Oleszczuk, Nédio
Rampazzo, Roger T.
Costa, Pedro A.
Silva, Márcia M.
Vale, Maria Goreti R.
Welz, Bernhard
Ferreira, Sergio Luis Costa
dc.subject.por.fl_str_mv Cadmium
Wheat flour
Slurry sampling
Solid sampling
ET AAS
topic Cadmium
Wheat flour
Slurry sampling
Solid sampling
ET AAS
description Acesso restrito: Texto completo. p. 400-406
publishDate 2008
dc.date.issued.fl_str_mv 2008
dc.date.accessioned.fl_str_mv 2012-05-31T13:56:39Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/6022
dc.identifier.issn.none.fl_str_mv 0039-9140
dc.identifier.number.pt_BR.fl_str_mv v. 77, n. 1
identifier_str_mv 0039-9140
v. 77, n. 1
url http://www.repositorio.ufba.br/ri/handle/ri/6022
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1016/j.talanta.2008.06.047
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