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Registro Completo |
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
27/03/2008 |
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Data da última atualização: |
28/06/2018 |
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Autoria: |
CASAGRANDE, J. C.; SOARES, M. R.; MOUTA, E. R. |
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Afiliação: |
José Carlos Casagrande, Universidade Federal de São Carlos/Centro de Ciências Agrárias/Departamento de Recursos Naturais e Proteção Ambiental; Marcio Roberto Soares, Universidade Federal de São Carlos/Centro de Ciências Agrárias/Departamento de Recursos Naturais e Proteção Ambiental; Ernesto Rinaldi Mouta, Universidade Federal de São Carlos/Centro de Ciências Agrárias/Departamento de Recursos Naturais e Proteção Ambiental. |
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Título: |
Zinc adsorption in highly weathered soils. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 43, n. 1, p. 131-139, jan. 2008 |
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Idioma: |
Inglês |
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Notas: |
Título em português: Adsorção de zinco em solos altamente intemperizados. |
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Conteúdo: |
The objective of this work was to assess the effects of pH and ionic strength upon zinc adsorption, in three highly weathered variable charge soils. Adsorption isotherms were elaborated from batch adsorption experiments, with increasing Zn concentrations (0?80 mg L-1), and adsorption envelopes were constructed through soil samples reactions with 0.01, 0.1 and 1 mol L-1 Ca(NO3)2 solutions containing 5 mg L-1 of Zn, with an increasing pH value from 3 to 8. Driving force of reaction was quantified by Gibbs free energy and separation factor. Isotherms were C-, H- and L-type and experimental results were fitted to nonlinear Langmuir model. Maximum adsorption ranged from 59?810 mg kg-1, and Zn affinity was greater in subsoil (0.13?0.81 L kg-1) than in the topsoil samples (0.01?0.34 L kg-1). Zinc adsorption was favorable and spontaneous, and showed sharply increase (20?90%) in the 4?6 pH range. No effect of ionic strength was observed at pH values below 5, because specific adsorption mechanisms predominated in the 3?5 pH range. Above pH 5, and in subsoil samples, Zn was adsorbed by electrostatic mechanisms, since ionic strength effect was observed. Despite depth and ionic strength effects, Zn adsorption depends mainly on the pH. |
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Palavras-Chave: |
adsorption envelope; adsorption isotherm; elemento-traço; envelope de adsorção; força iônica; isoterma de adsorção; trace element. |
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Thesagro: |
Ph. |
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Thesaurus Nal: |
ionic strength. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/38160/1/43n01a17.pdf
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Marc: |
LEADER 02041naa a2200265 a 4500
001 1123240
005 2018-06-28
008 2008 bl uuuu u00u1 u #d
100 1 $aCASAGRANDE, J. C.
245 $aZinc adsorption in highly weathered soils.
260 $c2008
500 $aTítulo em português: Adsorção de zinco em solos altamente intemperizados.
520 $aThe objective of this work was to assess the effects of pH and ionic strength upon zinc adsorption, in three highly weathered variable charge soils. Adsorption isotherms were elaborated from batch adsorption experiments, with increasing Zn concentrations (0?80 mg L-1), and adsorption envelopes were constructed through soil samples reactions with 0.01, 0.1 and 1 mol L-1 Ca(NO3)2 solutions containing 5 mg L-1 of Zn, with an increasing pH value from 3 to 8. Driving force of reaction was quantified by Gibbs free energy and separation factor. Isotherms were C-, H- and L-type and experimental results were fitted to nonlinear Langmuir model. Maximum adsorption ranged from 59?810 mg kg-1, and Zn affinity was greater in subsoil (0.13?0.81 L kg-1) than in the topsoil samples (0.01?0.34 L kg-1). Zinc adsorption was favorable and spontaneous, and showed sharply increase (20?90%) in the 4?6 pH range. No effect of ionic strength was observed at pH values below 5, because specific adsorption mechanisms predominated in the 3?5 pH range. Above pH 5, and in subsoil samples, Zn was adsorbed by electrostatic mechanisms, since ionic strength effect was observed. Despite depth and ionic strength effects, Zn adsorption depends mainly on the pH.
650 $aionic strength
650 $aPh
653 $aadsorption envelope
653 $aadsorption isotherm
653 $aelemento-traço
653 $aenvelope de adsorção
653 $aforça iônica
653 $aisoterma de adsorção
653 $atrace element
700 1 $aSOARES, M. R.
700 1 $aMOUTA, E. R.
773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 43, n. 1, p. 131-139, jan. 2008
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Registro original: |
Embrapa Unidades Centrais (AI-SEDE) |
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Registro Completo
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Biblioteca(s): |
Embrapa Agroindústria de Alimentos. |
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Data corrente: |
22/02/2011 |
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Data da última atualização: |
13/06/2011 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
KAIPPERT, V. C.; ROSADO, E. L.; LAGO, M. F.; UEHARA, S. K.; D'ANDREA, C. L.; NOGUEIRA, J.; OLIVEIRA, E. M. M. |
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Afiliação: |
VANESSA CHAIA KAIPPERT, UFRJ; ELIANE LOPES ROSADO, UFRJ; MARCIA FOFANO DO LAGO, UFRJ; SOFIA KIMI UEHARA, UFRJ; C. LIMA D'ANDREA, UFRJ; JULIANA NOGUEIRA, UFRJ; EDNA MARIA MORAIS OLIVEIRA, CTAA. |
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Título: |
The type of dietary fat influences the insulin resistance, but does not alter body weight in morbidly obesity women with the genotype Pro12Pro in PPAR gamma 2. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
In: INTERNATIONAL CONFERENCE ON NUTRIGENOMICS; INTERNATIONAL CONFERENCE ON MECHANISMS OF ANTIMUTAGENESIS AND ANTICARCINOGENESIS, 10., 2010, Guarujá. Posters... [S.l.: s.n.], 2010. |
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Idioma: |
Inglês |
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Palavras-Chave: |
Obesidade mórbida; Pro12Pro. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/36238/1/2010-280.pdf
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Marc: |
LEADER 00770nam a2200193 a 4500
001 1878413
005 2011-06-13
008 2010 bl uuuu u00u1 u #d
100 1 $aKAIPPERT, V. C.
245 $aThe type of dietary fat influences the insulin resistance, but does not alter body weight in morbidly obesity women with the genotype Pro12Pro in PPAR gamma 2.
260 $aIn: INTERNATIONAL CONFERENCE ON NUTRIGENOMICS; INTERNATIONAL CONFERENCE ON MECHANISMS OF ANTIMUTAGENESIS AND ANTICARCINOGENESIS, 10., 2010, Guarujá. Posters... [S.l.: s.n.]$c2010
653 $aObesidade mórbida
653 $aPro12Pro
700 1 $aROSADO, E. L.
700 1 $aLAGO, M. F.
700 1 $aUEHARA, S. K.
700 1 $aD'ANDREA, C. L.
700 1 $aNOGUEIRA, J.
700 1 $aOLIVEIRA, E. M. M.
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Embrapa Agroindústria de Alimentos (CTAA) |
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