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| Registros recuperados : 100 | |
| 32. |  | FIERRO, L. C.; GOMEZ, F.; GONZALEZ, M. H.; CHAVEZ, A. Use of goats to increase forage and animal production in brush infested rangelands of northern Mexico. IN: CONGRESS INTERNATIONAL RANGELAND: a resource under siege, 2., 1984, Adelaide. Proceedings. Canberra, Australia: Australian Academy of Science, 1986, p. 254-255.| Biblioteca(s): Embrapa Meio-Norte. |
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| 34. | | LEYVA, V. H.; GONZALEZ, M. G.; GARRIDO, F.; ROJAS, L.; MONTARAZ, J.; MARTINEZ, H. Clinical and pathological study of seropositive goats to caprine arthritis encephalitis virus (CAEV). In: INTERNATIONAL CONFERENCE ON GOATS, 7., 2000, Tours, Poitiers, France. Proceedings... Paris: INRA: IGA: Institut de Elevage, 2000. v. 2, p. 817.| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 35. | | FREITAS, E. R.; SAKOMURA, N. K.; MARTINS GONZALEZ, M.; BARBOSA, N. A. A. Comparação de métodos de determinação da gravidade específica de ovos de poedeiras comerciais . Pesquisa Agropecuária Brasileira, Brasília, DF, v. 39, n. 5, p. 509-512, maio 2004 Notas Científicas.
Título em inglês: Comparison of methods to measure the specific gravity of laying hen eggs.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 37. | | HERNANDEZ, L. M.; GONZALEZ, M. J.; RICO, M. C.; BALUJA, G. Contaminacion xenobiotica del Parque Nacional de Donana. III. Residuos de insecticidas organoclorados, bifenilos policlorados y metales pesados en ciconiformes. Donana, Acta Vertebra, v.11, n.2, p.197-212, 1984.| Biblioteca(s): Embrapa Pantanal. |
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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
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
13/05/2003 |
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Data da última atualização: |
09/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - A |
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Autoria: |
ARAÚJO, G. C. L.; GONZALEZ, M. H.; FERREIRA, A. G.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. |
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Afiliação: |
GEÓRGIA C. L. ARAÚJO, UFSCAR; MÁRIO H. GONZALEZ, UFSCAR; ANTÔNIO G. FERREIRA, UFSCAR; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; JOAQUIM A. NÓBREGA, UFSCAR. |
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Título: |
Effect of acid concentration on closed-vessel microwave-assisted digestion of plant materials. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Spectrochimica Acta part B, v.57, n.12, p.2121-2132, 2002. |
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DOI: |
https://doi.org/10.1016/S0584-8547(02)00164-7 |
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Idioma: |
Inglês |
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Conteúdo: |
The efficiency of microwave-assisted acid digestion of plants using different concentrations of nitric acid (2.0, 3.0, 5.0, 7.0 and 14 mol l-1) with hydrogen peroxide (30% v/v) was evaluated by measuring the residual carbon content (RCC) using inductively coupled plasma optical emission spectrometry (ICP-OES) with axial viewing. Certified reference materials were used for evaluating the accuracy attained when 2 mol l-1 HNO3 was employed for digestion. Under all experimental conditions RCC values were always lower than 13% w/v, and even the highest concentration did not cause any interference with element recovery. It seems that the high pressure reached for closed-vessel operation improved the oxidative action of nitric acid due to consequent temperature increase, even when this reagent was not used at high concentrations. According to acid?base titration data, residual acid in the digestates varied from 1.2 to 4.0 mol l-1, depending on the acid concentration initially added. It can be concluded that for plant materials, microwave-assisted acid digestion can be carried out under mild conditions, which implies that digestates do not need extensive dilution before introduction by pneumatic nebulization to ICP-OES. An additional advantage is the lower amount of residue generated when working with less concentrated acid solutions. |
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Palavras-Chave: |
Acid digestion; Closed vessel; Inductively coupled plasma optical emission spectrometry (ICP-OES; Microwave-assisted digestion; Plant materials; Residual carbon content. |
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Categoria do assunto: |
W Química e Física |
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Marc: |
LEADER 02212naa a2200253 a 4500
001 1046355
005 2022-06-09
008 2002 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/S0584-8547(02)00164-7$2DOI
100 1 $aARAÚJO, G. C. L.
245 $aEffect of acid concentration on closed-vessel microwave-assisted digestion of plant materials.$h[electronic resource]
260 $c2002
520 $aThe efficiency of microwave-assisted acid digestion of plants using different concentrations of nitric acid (2.0, 3.0, 5.0, 7.0 and 14 mol l-1) with hydrogen peroxide (30% v/v) was evaluated by measuring the residual carbon content (RCC) using inductively coupled plasma optical emission spectrometry (ICP-OES) with axial viewing. Certified reference materials were used for evaluating the accuracy attained when 2 mol l-1 HNO3 was employed for digestion. Under all experimental conditions RCC values were always lower than 13% w/v, and even the highest concentration did not cause any interference with element recovery. It seems that the high pressure reached for closed-vessel operation improved the oxidative action of nitric acid due to consequent temperature increase, even when this reagent was not used at high concentrations. According to acid?base titration data, residual acid in the digestates varied from 1.2 to 4.0 mol l-1, depending on the acid concentration initially added. It can be concluded that for plant materials, microwave-assisted acid digestion can be carried out under mild conditions, which implies that digestates do not need extensive dilution before introduction by pneumatic nebulization to ICP-OES. An additional advantage is the lower amount of residue generated when working with less concentrated acid solutions.
653 $aAcid digestion
653 $aClosed vessel
653 $aInductively coupled plasma optical emission spectrometry (ICP-OES
653 $aMicrowave-assisted digestion
653 $aPlant materials
653 $aResidual carbon content
700 1 $aGONZALEZ, M. H.
700 1 $aFERREIRA, A. G.
700 1 $aNOGUEIRA, A. R. de A.
700 1 $aNÓBREGA, J. A.
773 $tSpectrochimica Acta part B$gv.57, n.12, p.2121-2132, 2002.
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