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Registro Completo |
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Biblioteca(s): |
Embrapa Roraima. |
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Data corrente: |
21/01/2016 |
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Data da última atualização: |
19/02/2016 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
XAUD, M. R.; ALMEIDA, C. M. de; XAUD, H. A. M. |
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Afiliação: |
MARISTELA RAMALHO XAUD, CPAF-RR; HARON ABRAHIM MAGALHAES XAUD, CPAF-RR. |
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Título: |
Modelagem dinâmica espacial das mudanças de cobertura da terra na região sul do Estado de Roraima, norte da Amazônia. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
In: SIMPÓSIO BRASILEIRO DE SENSORIAMENTO REMOTO, 17., 2015, João Pessoa. Anais... São José dos Campos: INPE, 2015. |
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Idioma: |
Português |
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Thesagro: |
Desmatamento. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/137522/1/artigo-publicado-Xaudetal.2015.pdf
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Marc: |
LEADER 00516nam a2200133 a 4500
001 2034766
005 2016-02-19
008 2015 bl uuuu u00u1 u #d
100 1 $aXAUD, M. R.
245 $aModelagem dinâmica espacial das mudanças de cobertura da terra na região sul do Estado de Roraima, norte da Amazônia.
260 $aIn: SIMPÓSIO BRASILEIRO DE SENSORIAMENTO REMOTO, 17., 2015, João Pessoa. Anais... São José dos Campos: INPE$c2015
650 $aDesmatamento
700 1 $aALMEIDA, C. M. de
700 1 $aXAUD, H. A. M.
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Registro original: |
Embrapa Roraima (CPAF-RR) |
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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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Embrapa Pecuária Sudeste (CPPSE) |
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