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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pecuária Sudeste. Para informações adicionais entre em contato com cppse.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
12/07/2006 |
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Data da última atualização: |
30/08/2013 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
DONATI, G. L.; NASCENTES, C. C.; NOGUEIRA, A. R. de A.; ARRUDA, M. A. Z.; NÓBREGA, J. A. |
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Título: |
Acid extraction and cloud point preconcentration as sample preparation strategies for cobalt determination in biological materials by thermospray flame furnace atomic absorption spectrometry. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Microchemical Journal, v.82, p.189-195, 2006. |
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Idioma: |
Inglês |
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Conteúdo: |
A thermospray flame furnace atomic absorption spectrometer (TS-FF-AAS) was employed for Co detennination in biological materiaIs. Cobalt presents a high atomization temperature and consequently poor sensitivity is obtained without changing its thennochemical behavior. The effect of different complexing agents on sensitivity was evaluated based on the fonnation of Co volatile compounds. A cloud point procedure was optimized for Co preconcentration for further improvement of sensitivity. Samples were treated with I moI I-I hydrochloric acid solution for quantitative extraction of Co without simultaneous extraction of Fe, since it is a strong interferent. After the extraction and preconcentration steps, a sample volume of 150 /lI was introduced into the hot Ni tube using air as carrier at a tlow-rate of 0.4 ml min- I. The best sensitivity was attained using ammonium pyrrolidinedithiocarbamate (APDC) and Triton X-114 was employed for implementation of the cloud point procedure. The detection limit obtained for Co was 2.1 /lg 1-1 and the standard deviation was 5.8% for a solution containing 100/lg I-I (n= 10). Accuracy was checked using two certified reference materiaIs (tomato leaves and bovine li ver) and results were in agreement with certified values at a 95% confidence leveI. Employing the developed procedure, Co were quantified in different biological materiaIs (plant and animal tissues). |
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Palavras-Chave: |
Acid extraction; Cloud point extraction; Flame atomic absorption spectrometry; Thermospray; Tube in flame. |
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Thesaurus Nal: |
cobalt. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02213naa a2200241 a 4500
001 1045669
005 2013-08-30
008 2006 bl uuuu u00u1 u #d
100 1 $aDONATI, G. L.
245 $aAcid extraction and cloud point preconcentration as sample preparation strategies for cobalt determination in biological materials by thermospray flame furnace atomic absorption spectrometry.
260 $c2006
520 $aA thermospray flame furnace atomic absorption spectrometer (TS-FF-AAS) was employed for Co detennination in biological materiaIs. Cobalt presents a high atomization temperature and consequently poor sensitivity is obtained without changing its thennochemical behavior. The effect of different complexing agents on sensitivity was evaluated based on the fonnation of Co volatile compounds. A cloud point procedure was optimized for Co preconcentration for further improvement of sensitivity. Samples were treated with I moI I-I hydrochloric acid solution for quantitative extraction of Co without simultaneous extraction of Fe, since it is a strong interferent. After the extraction and preconcentration steps, a sample volume of 150 /lI was introduced into the hot Ni tube using air as carrier at a tlow-rate of 0.4 ml min- I. The best sensitivity was attained using ammonium pyrrolidinedithiocarbamate (APDC) and Triton X-114 was employed for implementation of the cloud point procedure. The detection limit obtained for Co was 2.1 /lg 1-1 and the standard deviation was 5.8% for a solution containing 100/lg I-I (n= 10). Accuracy was checked using two certified reference materiaIs (tomato leaves and bovine li ver) and results were in agreement with certified values at a 95% confidence leveI. Employing the developed procedure, Co were quantified in different biological materiaIs (plant and animal tissues).
650 $acobalt
653 $aAcid extraction
653 $aCloud point extraction
653 $aFlame atomic absorption spectrometry
653 $aThermospray
653 $aTube in flame
700 1 $aNASCENTES, C. C.
700 1 $aNOGUEIRA, A. R. de A.
700 1 $aARRUDA, M. A. Z.
700 1 $aNÓBREGA, J. A.
773 $tMicrochemical Journal$gv.82, p.189-195, 2006.
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Embrapa Pecuária Sudeste (CPPSE) |
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| Registros recuperados : 8 | |
| 1. |  | NASCENTES, C. C.; NÓBREGA, J. A.; NOGUEIRA, A. R. de A.; ARRUDA, M. A. Z. Direct determination of Cu, Mn, and Zn in beer using thermospray flame furnace atomic absorption spectrometry. In: RIO SYMPOSIUM ON ATOMIC SPECTOMETRY, 8., 2004, Parati. Book of Abstracts... Rio de Janeiro: Pontifícia Universidade Católica do Rio de Janeiro, 2004. v.1 p.89.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 4. | | PEDROSO, M. M.; COSTA, L. M.; NASCENTES, C. C.; SANTOS, S. M.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. Preparo de amostras utilizando forno de microondas com radiação focalizada através da adição de amostra ao reagente pré-aquecido. In: REUNIÃO ANUAL DA SOCIEDADE DE BRASILEIRA DE QUÍMICA, 26., 2003, Poços de Caldas, MG. Livros de resumos... Poços de Caldas: SBQ, 2003. QA-162.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 5. | | ROSINI, F.; DONATI, G. L.; NASCENTES, C. C.; ARRUDA, M. A. Z.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. Espectrometria de absorção atômica com forno tubular na chama e aerossol térmico (TS_FF_AAS): comportamento dos elementos selênio e cobalto. In: CONGRESSO DE PÓS GRADUAÇÃO DA UNIVERSIDADE FEDERAL DE SÃO CARLOS, 3., 2005, São Carlos. Anais... São Carlos: UFSCar, 2005. v. 1. p. 1561-1562.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 7. | | DONATI, G. L.; NASCENTES, C. C.; NOGUEIRA, A. R. de A.; ARRUDA, M. A. Z.; NÓBREGA, J. A. Determinação de cobalto em amostras biológicas por espectrometria de absorção atômica com forno tubular na chama e aerossol térmico (TS-FF-AAS) In: ENCONTRO NACIONAL DE QUÍMICA ANALÍTICA, 13.; CONGRESSO ÍBERO - AMERICANO DE QUÍMICA ANALÍTICA, 2005, Niterói, RJ. Anais... Niterói: BENQ, 2005. 1 CD-ROM.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 8. | | NASCENTES, C. C.; KAMOGAWA, M. Y.; FERNANDES, K. F.; ARRUDA, M. A. Z.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. Direct determination of Cu, Mn, Pb, Zn in beer by thermospray flame furnace atomic absorption spectrometry. Spectrochimica Acta Part B, v. 60, p. 749-753, 2005.| Tipo: Artigo em Periódico Indexado |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| Registros recuperados : 8 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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