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6. | | ARAÚJO, G. C. L.; NABAIS, C.; GONÇALVES, S.; FREITAS, H.; NOGUEIRA, A. R. de A. Fracionamento da parede celular de raízes de Paspalum notatum (grama batatais) para investigação da alocação de metais. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE QUÍMICA, 29., 2006, Águas de Lindóia, SP. Anais... Águas de Lindóia: SBQ, 2006. 2p. 1 CD-ROM Biblioteca(s): Embrapa Pecuária Sudeste. |
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8. | | 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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10. | | ARAÚJO, G. C. L.; LEMOS, S. G.; FERREIRA, A. G.; NOGUEIRA, A. R. de A. Efeito do pré-tratamento ácido do material biossorvente na sorção de CU 2+, Mi 2+, Fe 3+, e AI 3+. In: ENCONTRO NACIONAL DE QUÍMICA ANALÍTICA, 13.; CONGRESSO ÍBERO - AMERICANO DE QUÍMICA ANALÍTICA, 2005, Niterói, RJ. Anais... Niterói: BENQ, 2005. 1 CD-ROM Biblioteca(s): Embrapa Pecuária Sudeste. |
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20. | | ARAÚJO, G. C. L.; LEMOS, S. G.; FERREIRA, A. G.; FREITAS, H.; NOGUEIRA, A. R. de A. Effect of pre-treatment and supporting media on Ni(II), Cu(II), Al(III) and Fe(III) sorption by plant root material. Chemosphere, v. 68, n. 3, p. 537-545, jun. 2007. Biblioteca(s): Embrapa Pecuária Sudeste. |
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Registros recuperados : 21 | |
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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. |
Título: |
Microwave single vessel acid-vapor extraction: effect of experimental paramenters on Co and Fe determination in biological samples. |
Ano de publicação: |
2004 |
Fonte/Imprenta: |
Microchimica Acta, v.144, p.81-85, 2004. |
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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