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| Registros recuperados : 171 | |
| 6. |  | 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.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 10. | | ARAÚJO, G. C. L.; GONZALEZ, M. H.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. Effect of nitric acid concentration on closed-vessel microwave-assisted digestation of plant materials. In: RIO SYMPOSIUM ON ATOMIC SPECTROMETRY, 17., 2002, Florianópolis, SC. Abstracts... Florianópolis: UFSC, 2002. p.137. ICP Information Newsletter, v.28, n.1, jun 2002.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 11. | | NOGUEIRA, A. R. de A.; TREVIZAN, L. C.; SILVA, F. V.; NÓBREGA, J. A. Effect of residual carbon on performance of inductively coupled plasma optical emission spectrometry with axial viewing. In: 2002 WINTER CONFERENCE ON PLASMA SPECTROCHEMISTRY, 2002, Scottsdale, Arizona. ICP Information Newsletter, v.27, n.10, nov. 2002.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 12. | | TREVISAN, L. C.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. Acid vapor partial digestion of biological samples in a focused microwave: multielement determination by ICP OES with axially-viewed configuration. In: RIO SYMPOSIUM ON ATOMIC SPECTROMETRY, 7., 2002, Florianópolis, SC. ICP Information Newsletter, v.28, n.1, june 2002. p.136. Tu34.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 15. | | SANTOS, D. M.; NOGUEIRA, A. R. de A.; NEVES, E. F. A.; NÓBREGA, J. A. Análise química e simulação do reagente CFA-C. In: ENCONTRO REGIONAL DE QUÍMICA DA SOCIEDADE BRASILEIRA DE QUÍMICA, 13.; SEMANA DA QUÍMICA, 31., 2001, Jaboticabal, SP. Anais... Jaboticabal: Instituto de Química-UNESP, 2001. p.70. QA-8.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| Registros recuperados : 171 | |
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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. |
Registro Completo
|
Biblioteca(s): |
Embrapa Pecuária Sudeste. |
|
Data corrente: |
07/06/2004 |
|
Data da última atualização: |
06/05/2022 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Autoria: |
ARAÚJO, G. C. L.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. |
|
Afiliação: |
GEORGIA C. L. ARAUJO, UFSCAR; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; JOAQUIM A. NÓBREGA, UFSCAR. |
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Título: |
Microwave single vessel acid-vapor extraction: effect of experimental paramenters on Co and Fe determination in biological samples. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Microchimica Acta, v.144, p.81-85, 2004. |
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DOI: |
10.1007/s00604-003-0092-3 |
|
Idioma: |
Inglês |
|
Conteúdo: |
Characteristic parameters of a single vesselprocedure were investigated for Co and Fe determina-tion in biological samples using nitric acid-vapor extrac-tion under atmospheric pressure. A laboratory-madePTFE support vessel suitable for four cups containingthe samples was adapted to fit on the microwave glassvessel. Biological samples (30 mg) were weigheddirectly into these PTFE cups and exposed to nitric acidvapor stemming from 15 mL concentrated HNO3placedin the bottom of the glass vessel. Sample cups werepositioned at 50, 80, 110, and 140 mm from the supportbase. We evaluated the temperature, acidity, and resi-dual carbon content of each sample cup, i.e. parametersthat could influence the efficiency of vapor-phase aciddigestion. The influence of sample particle size ondigestion efficiency was also considered. It was demon-strated that temperature was the main parameter forefficient recovery of both Co and Fe in biological sam-ples, and higher temperatures allowed lower residualcarbon contents. |
|
Palavras-Chave: |
Microwave; Sample preparation; Single vessel; Vapor phase. |
|
Categoria do assunto: |
W Química e Física |
|
Marc: |
LEADER 01669naa a2200205 a 4500
001 1046839
005 2022-05-06
008 2004 bl uuuu u00u1 u #d
024 7 $a10.1007/s00604-003-0092-3$2DOI
100 1 $aARAÚJO, G. C. L.
245 $aMicrowave single vessel acid-vapor extraction$beffect of experimental paramenters on Co and Fe determination in biological samples.$h[electronic resource]
260 $c2004
520 $aCharacteristic parameters of a single vesselprocedure were investigated for Co and Fe determina-tion in biological samples using nitric acid-vapor extrac-tion under atmospheric pressure. A laboratory-madePTFE support vessel suitable for four cups containingthe samples was adapted to fit on the microwave glassvessel. Biological samples (30 mg) were weigheddirectly into these PTFE cups and exposed to nitric acidvapor stemming from 15 mL concentrated HNO3placedin the bottom of the glass vessel. Sample cups werepositioned at 50, 80, 110, and 140 mm from the supportbase. We evaluated the temperature, acidity, and resi-dual carbon content of each sample cup, i.e. parametersthat could influence the efficiency of vapor-phase aciddigestion. The influence of sample particle size ondigestion efficiency was also considered. It was demon-strated that temperature was the main parameter forefficient recovery of both Co and Fe in biological sam-ples, and higher temperatures allowed lower residualcarbon contents.
653 $aMicrowave
653 $aSample preparation
653 $aSingle vessel
653 $aVapor phase
700 1 $aNOGUEIRA, A. R. de A.
700 1 $aNÓBREGA, J. A.
773 $tMicrochimica Acta$gv.144, p.81-85, 2004.
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