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| 1. |  | MARTIN-NETO, L.; NASCIMENTO, O. R.; TALAMONI, J. Caracterização de ácido húmico e fúlvico por ressonância paramagnética eletrônica (RPE). In: REUNIÂO ANUAL DA SBPC, 39., 1987, Brasília, DF. Ciência e Cultura, São Paulo, v.39, n.7, p.485, jul. 1987. Suplemento. Resumos. ref.79-D.2.4.| Biblioteca(s): Embrapa Instrumentação. |
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| 4. | | MARTIN-NETO, L.; NOGUEIRA, A. R. A.; MIYAZAWA, M.; TALAMONI, J.; NASCIMENTO, O. R. Caracterização de ions metálicos em solos e plantas por ressonância paramagnética eletrônica. In: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 11., 1988, Caxambu, MG. Programas e resumos... Sao Paulo: Sociedade Brasileira de Fisica, 1988. p.30.| Biblioteca(s): Embrapa Instrumentação. |
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| Registros recuperados : 6 | |
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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: |
09/01/1998 |
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Data da última atualização: |
02/03/2010 |
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Autoria: |
MARTIN-NETO, L.; NASCIMENTO, O. R.; TALAMONI, J.; POPPI, N. R. |
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Afiliação: |
EMBRAPA-CNPDIA; USP-IFSC; UFMS. |
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Título: |
EPR of micronutrients-humic substances complexes extracted from a Brazilian soil. |
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Ano de publicação: |
1991 |
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Fonte/Imprenta: |
Soil Science, Baltimore, v.151, n.5, p.369-376, May 1991. |
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Idioma: |
Inglês |
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Conteúdo: |
The technique of electron paramagnetic resonance was used to examine the formation of micronutrients-humic substances complexes extracted from a Brazilian soil. Results indicate that there are two types of copper (II) complexes, one with oxygen and another with nitrogen atoms, in humic acids while in fulvic acids only the copper complexed with oxygen was detected. The iron (III) complex signal with g = 4.3 was observed in both humic acid and fulvic acid. The concentration of free radicals (semiquinone) detected in humic acids (10 15 spins/g) was bigger than in fulvic acids (10 14 spins/g) due to a greater humidification degree confirmed by elementary analysis and E4/E6 ratio measurements. |
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Palavras-Chave: |
Brazilian; Electron paramagnetic resonance; EPR; Humic; Micronutriente; Micronutrients; Micronutrients-humic; Substances. |
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Thesagro: |
Matéria Orgânica; Solo. |
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Thesaurus NAL: |
Brazil; organic matter; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01526naa a2200313 a 4500
001 1026406
005 2010-03-02
008 1991 bl --- 0-- u #d
100 1 $aMARTIN-NETO, L.
245 $aEPR of micronutrients-humic substances complexes extracted from a Brazilian soil.
260 $c1991
520 $aThe technique of electron paramagnetic resonance was used to examine the formation of micronutrients-humic substances complexes extracted from a Brazilian soil. Results indicate that there are two types of copper (II) complexes, one with oxygen and another with nitrogen atoms, in humic acids while in fulvic acids only the copper complexed with oxygen was detected. The iron (III) complex signal with g = 4.3 was observed in both humic acid and fulvic acid. The concentration of free radicals (semiquinone) detected in humic acids (10 15 spins/g) was bigger than in fulvic acids (10 14 spins/g) due to a greater humidification degree confirmed by elementary analysis and E4/E6 ratio measurements.
650 $aBrazil
650 $aorganic matter
650 $asoil
650 $aMatéria Orgânica
650 $aSolo
653 $aBrazilian
653 $aElectron paramagnetic resonance
653 $aEPR
653 $aHumic
653 $aMicronutriente
653 $aMicronutrients
653 $aMicronutrients-humic
653 $aSubstances
700 1 $aNASCIMENTO, O. R.
700 1 $aTALAMONI, J.
700 1 $aPOPPI, N. R.
773 $tSoil Science, Baltimore$gv.151, n.5, p.369-376, May 1991.
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Embrapa Instrumentação (CNPDIA) |
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