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Registro Completo |
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Biblioteca(s): |
Embrapa Algodão. |
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Data corrente: |
15/06/2009 |
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Data da última atualização: |
15/06/2009 |
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Autoria: |
SOARES, L. H. de B.; ALVES, B. J. R.; URQUIAGA, S.; BODDEY, R. M. |
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Título: |
Especial EMBRAPA. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Agroanalysis, v. 29, n. 4, p. 21-33, 2009. |
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Idioma: |
Português |
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Thesagro: |
Biocombustível; Cana de Açúcar; Efeito Estufa; Etanol. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00481naa a2200193 a 4500
001 1277890
005 2009-06-15
008 2009 bl uuuu u00u1 u #d
100 1 $aSOARES, L. H. de B.
245 $aEspecial EMBRAPA.
260 $c2009
650 $aBiocombustível
650 $aCana de Açúcar
650 $aEfeito Estufa
650 $aEtanol
700 1 $aALVES, B. J. R.
700 1 $aURQUIAGA, S.
700 1 $aBODDEY, R. M.
773 $tAgroanalysis$gv. 29, n. 4, p. 21-33, 2009.
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Registro original: |
Embrapa Algodão (CNPA) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
22/12/1999 |
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Data da última atualização: |
22/12/1999 |
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Autoria: |
SPOSITO, G.; MARTIN-NETO, L.; YANG, A. |
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Afiliação: |
University of California, Berkeley; EMBRAPA-CNPDIA. |
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Título: |
Mechanisms of atrazine reactions with humic acid. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
In: AMERICAN GEOPHYSICAL UNION MEETING, Dec. 1996, San Francisco, CA, Estados Unidos. Abstracts... San Francisco: American Geophysical Union, 1996. |
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Páginas: |
não paginado. |
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Idioma: |
Inglês |
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Conteúdo: |
Among the post-emergent herbicides, atrazine (6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine) is the one most applied worldwide. It is also widely detected in water supplies, thus an important indicator of pesticide contamination, with growing public concern over its potential carcinogenic effects. The complexation pathways of atrazine with humic acid remain controversial, in part because of the absence of direct spectroscopic information. The basic question is whether proton-transfer and, to a lesser extent, hydrogen bonding are as important as electron-transfer in the mechanisms of reaction between atrazine and humic acid. Representative tropical and temperate-zone humic acids were reacted at pH<7 with 140 mmol mE-3 atrazine solution under exclusion of light. Infrared and electron spin resonance spectra of the resulting products gave evidence for proton-transfer and, under certain conditions, electron-transfer reactions. These spectroscopic data and those from other published studies were analyzed in terms of the molecular properties of humic acids and s-triazines, out of which emerged a guiding principle to characterize the complexation mechanisms of s-triazines with humic acid: proton-transfer is favored (and electron-transfer is disfavored) for humic acids of high acidic functional group content and for s-triazines of low basicity. Electron-transfer mechanisms are favored for humic acids of low acidic functional group content and for s-triazines of high basicity... MenosAmong the post-emergent herbicides, atrazine (6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine) is the one most applied worldwide. It is also widely detected in water supplies, thus an important indicator of pesticide contamination, with growing public concern over its potential carcinogenic effects. The complexation pathways of atrazine with humic acid remain controversial, in part because of the absence of direct spectroscopic information. The basic question is whether proton-transfer and, to a lesser extent, hydrogen bonding are as important as electron-transfer in the mechanisms of reaction between atrazine and humic acid. Representative tropical and temperate-zone humic acids were reacted at pH<7 with 140 mmol mE-3 atrazine solution under exclusion of light. Infrared and electron spin resonance spectra of the resulting products gave evidence for proton-transfer and, under certain conditions, electron-transfer reactions. These spectroscopic data and those from other published studies were analyzed in terms of the molecular properties of humic acids and s-triazines, out of which emerged a guiding principle to characterize the complexation mechanisms of s-triazines with humic acid: proton-transfer is favored (and electron-transfer is disfavored) for humic acids of high acidic functional group content and for s-triazines of low basicity. Electron-transfer mechanisms are favored for humic acids of low acidic functional group content and for s-triazines of high ... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02018naa a2200157 a 4500
001 1027066
005 1999-12-22
008 1996 bl --- 0-- u #d
100 1 $aSPOSITO, G.
245 $aMechanisms of atrazine reactions with humic acid.
260 $c1996
300 $anão paginado.
520 $aAmong the post-emergent herbicides, atrazine (6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine) is the one most applied worldwide. It is also widely detected in water supplies, thus an important indicator of pesticide contamination, with growing public concern over its potential carcinogenic effects. The complexation pathways of atrazine with humic acid remain controversial, in part because of the absence of direct spectroscopic information. The basic question is whether proton-transfer and, to a lesser extent, hydrogen bonding are as important as electron-transfer in the mechanisms of reaction between atrazine and humic acid. Representative tropical and temperate-zone humic acids were reacted at pH<7 with 140 mmol mE-3 atrazine solution under exclusion of light. Infrared and electron spin resonance spectra of the resulting products gave evidence for proton-transfer and, under certain conditions, electron-transfer reactions. These spectroscopic data and those from other published studies were analyzed in terms of the molecular properties of humic acids and s-triazines, out of which emerged a guiding principle to characterize the complexation mechanisms of s-triazines with humic acid: proton-transfer is favored (and electron-transfer is disfavored) for humic acids of high acidic functional group content and for s-triazines of low basicity. Electron-transfer mechanisms are favored for humic acids of low acidic functional group content and for s-triazines of high basicity...
700 1 $aMARTIN-NETO, L.
700 1 $aYANG, A.
773 $tIn: AMERICAN GEOPHYSICAL UNION MEETING, Dec. 1996, San Francisco, CA, Estados Unidos. Abstracts... San Francisco: American Geophysical Union, 1996.
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