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Registro Completo |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
04/03/2008 |
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Data da última atualização: |
05/03/2008 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MELO, E. E. C. de; NASCIMENTO, C. W. A. do; ACCIOLY, A. M. A.; SANTOS, A. C. Q. |
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Afiliação: |
Évio Eduardo Chaves de Melo, UFRPE; Clístenes Williams Araújo do Nascimento, UFRPE; Adriana Maria Aguiar Accioly, CNPMF; Ana Cristiane Queiroz SAntos, UFRPE. |
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Título: |
Phytoextraction and fractionation of heavy metals in soil after multiple applications of natural chelants. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Scientia Agricola, Piracicaba, v. 65, n. 1, p. 61-68, 2008. |
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ISSN: |
0103-9016 |
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Idioma: |
Inglês |
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Notas: |
doi: 10.1590/S0103-90162008000100009 |
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Conteúdo: |
Chelate-assisted phytoextraction of heavy metals is a promising approach to clean up polluted soils. However, the most successful chelants tested so far are synthetic agents that barely degrade in soil, increasing the metal leaching risks. Natural organic acids have been proposed to enhance phytoextraction due to their higher biodegradability, but they can also be a drawback for efficient phytoextraction. This work was carried out to compare the effectiveness of multiple applications of citric and gallic acids on the availability in soil and accumulation of Cd, Pb, Cu, and Zn by velvet bean (Stizolobium aterrimum) plants. The organic acids were added as follows: 5 mmol kg-1 in the 28th cultivation day; two doses of 5 mmol kg-1 at the 28th and 31st day; and three applications at the same rate at the 28th, 31st, and 34th day of velvet bean cultivation. Soil samples were sequentially extracted and soil solution metal concentrations assessed. Neither citric acid nor gallic acid was efficient for metals phytoextraction. In general, low molecular weight organic acids (LMWOA) application increased the metal concentrations in the water soluble and exchangeable fractions. Zinc and Cu were retained mostly in the organic matter fraction. Zn was remobilized from the organic matter fraction through LMWOA application into the water soluble and exchangeable fractions. LMWOA mobilized Pb and Cu from iron oxides, but such an increase in solubility was not high enough to affect phytoextraction. MenosChelate-assisted phytoextraction of heavy metals is a promising approach to clean up polluted soils. However, the most successful chelants tested so far are synthetic agents that barely degrade in soil, increasing the metal leaching risks. Natural organic acids have been proposed to enhance phytoextraction due to their higher biodegradability, but they can also be a drawback for efficient phytoextraction. This work was carried out to compare the effectiveness of multiple applications of citric and gallic acids on the availability in soil and accumulation of Cd, Pb, Cu, and Zn by velvet bean (Stizolobium aterrimum) plants. The organic acids were added as follows: 5 mmol kg-1 in the 28th cultivation day; two doses of 5 mmol kg-1 at the 28th and 31st day; and three applications at the same rate at the 28th, 31st, and 34th day of velvet bean cultivation. Soil samples were sequentially extracted and soil solution metal concentrations assessed. Neither citric acid nor gallic acid was efficient for metals phytoextraction. In general, low molecular weight organic acids (LMWOA) application increased the metal concentrations in the water soluble and exchangeable fractions. Zinc and Cu were retained mostly in the organic matter fraction. Zn was remobilized from the organic matter fraction through LMWOA application into the water soluble and exchangeable fractions. LMWOA mobilized Pb and Cu from iron oxides, but such an increase in solubility was not high enough to affect phytoextractio... Mostrar Tudo |
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Thesagro: |
Metal; Solo. |
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Thesaurus Nal: |
pollution. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02149naa a2200217 a 4500
001 1654832
005 2008-03-05
008 2008 bl --- 0-- u #d
022 $a0103-9016
100 1 $aMELO, E. E. C. de
245 $aPhytoextraction and fractionation of heavy metals in soil after multiple applications of natural chelants.
260 $c2008
500 $adoi: 10.1590/S0103-90162008000100009
520 $aChelate-assisted phytoextraction of heavy metals is a promising approach to clean up polluted soils. However, the most successful chelants tested so far are synthetic agents that barely degrade in soil, increasing the metal leaching risks. Natural organic acids have been proposed to enhance phytoextraction due to their higher biodegradability, but they can also be a drawback for efficient phytoextraction. This work was carried out to compare the effectiveness of multiple applications of citric and gallic acids on the availability in soil and accumulation of Cd, Pb, Cu, and Zn by velvet bean (Stizolobium aterrimum) plants. The organic acids were added as follows: 5 mmol kg-1 in the 28th cultivation day; two doses of 5 mmol kg-1 at the 28th and 31st day; and three applications at the same rate at the 28th, 31st, and 34th day of velvet bean cultivation. Soil samples were sequentially extracted and soil solution metal concentrations assessed. Neither citric acid nor gallic acid was efficient for metals phytoextraction. In general, low molecular weight organic acids (LMWOA) application increased the metal concentrations in the water soluble and exchangeable fractions. Zinc and Cu were retained mostly in the organic matter fraction. Zn was remobilized from the organic matter fraction through LMWOA application into the water soluble and exchangeable fractions. LMWOA mobilized Pb and Cu from iron oxides, but such an increase in solubility was not high enough to affect phytoextraction.
650 $apollution
650 $aMetal
650 $aSolo
700 1 $aNASCIMENTO, C. W. A. do
700 1 $aACCIOLY, A. M. A.
700 1 $aSANTOS, A. C. Q.
773 $tScientia Agricola, Piracicaba$gv. 65, n. 1, p. 61-68, 2008.
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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| Registros recuperados : 39 | |
| 11. |  | SANTOS, N. M. dos; ACCIOLY, A. M. de A.; NASCIMENTO, C. W. A. do; SANTOS, J. A. G. Avaliação de extratores de teores disponíveis de chumbo em solo contaminado tratado com ácidos húmicos e carvão vegetal ativado. In: REUNIÃO BRASILEIRA DE FERTILIDADE DO SOLO E NUTRIÇÃO DE PLANTAS, 30.; REUNIÃO BRASILEIRA SOBRE MICORRIZAS, 14.; SIMPÓSIO BRASILEIRO MICROBILOGIA DO SOLO, 12.; REUNIÃO BRASILEIRA DE BIOLOGIA DO SOLO, 09.; SIMPÓSIO SOBRE SELÊNIO NO BRASIL, 1., 2012, Macéio. Fertbio 2012: "A responsabilidade socioambiental da pesquisa agrícola" : [anais...]. Maceió: Sociedade Brasileira de Ciência do Solo; Centro de Ciências Agrárias da Universidade Federal de Alagoas, 2012. 1 CR-ROM.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Mandioca e Fruticultura. |
|    |
| 13. | | SANTOS, N. M. dos; ACCIOLY, A. M. de A.; NASCIMENTO, C. W. A. do; SANTOS, J. A. G. Ácidos húmicos e carvão vegetal ativado como amenizantes da fitotoxicidade de Pb em milho. In: REUNIÃO BRASILEIRA DE FERTILIDADE DO SOLO E NUTRIÇÃO DE PLANTAS, 30.; REUNIÃO BRASILEIRA SOBRE MICORRIZAS, 14.; SIMPÓSIO BRASILEIRO MICROBILOGIA DO SOLO, 12.; REUNIÃO BRASILEIRA DE BIOLOGIA DO SOLO, 09.; SIMPÓSIO SOBRE SELÊNIO NO BRASIL, 1., 2012, Macéio. Fertbio 2012: "A responsabilidade socioambiental da pesquisa agrícola" : [anais...]. Maceió: Sociedade Brasileira de Ciência do Solo; Centro de Ciências Agrárias da Universidade Federal de Alagoas, 2012. 1 CR-ROM.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Mandioca e Fruticultura. |
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| 20. | | COSTA, W. P. L. B. da; NASCIMENTO, C. W. A. do; CUNHA, K. P. V. da; SILVA, D. J.; FERREIRA, H. A. Alterações nos teores totais de Mn, Fe, Ni, e Pb em solos cultivados com videira. In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 32., 2009, Fortaleza. O solo e a produção de bioenergia: perspectivas e desafios. Fortaleza: UFC: SBCS, 2009. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Semiárido. |
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| Registros recuperados : 39 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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