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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: |
11/08/2004 |
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Data da última atualização: |
08/03/2010 |
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Autoria: |
NOVOTNY, E. H.; MARTIN-NETO, L. |
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Título: |
Spectroscopic studies of soil humic acids from tillage systems experiments - multivariate data analyzes |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
In: INTERNATIONAL MEETING OF INTERNATIONAL HUMIC SUBSTANCES SOCIETY. -- IHSS, 12, São Pedro, SP, 2004. Humic substances and soil and water environment. Abstracts...[São Carlos], SP: Embrapa Instrumentação Agropecuária, 2004. p. 46 |
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Idioma: |
Inglês |
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Conteúdo: |
I. INTRODUCTION
For the characterization 01 humic substances, several chemical and physical methods hav been used intensely. Among these, spectroscopic methods such as nuclear magnetic resonan (NMA), electron paramagnetic resonance (EPA) and Iluorescence have received special attenti Nevertheless, the presence of residual paramagnetic ions in humic substances can affect t spectroscopic results. 80, the direct interpretation of these results and correlations between lhe", and intrinsic characteristics 01 lhe samples, such as humilication degree, can be mistaken. The challenge is to isolate the effect 01 the paramagnetic ions in such a way that the obtained spectrosc ' data can be used to inler about the structure 01 the humic substances. A technique that cal) uselul lor that is the multivariate statistics, especially the Principal Components Analysis (PCA).
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Palavras-Chave: |
Ácido húmico; RMN; Soil humic acids; Solo húmico. |
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Thesaurus NAL: |
spectroscopy; tillage. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01631naa a2200205 a 4500
001 1028582
005 2010-03-08
008 2004 bl --- 0-- u #d
100 1 $aNOVOTNY, E. H.
245 $aSpectroscopic studies of soil humic acids from tillage systems experiments - multivariate data analyzes
260 $c2004
520 $aI. INTRODUCTION For the characterization 01 humic substances, several chemical and physical methods hav been used intensely. Among these, spectroscopic methods such as nuclear magnetic resonan (NMA), electron paramagnetic resonance (EPA) and Iluorescence have received special attenti Nevertheless, the presence of residual paramagnetic ions in humic substances can affect t spectroscopic results. 80, the direct interpretation of these results and correlations between lhe", and intrinsic characteristics 01 lhe samples, such as humilication degree, can be mistaken. The challenge is to isolate the effect 01 the paramagnetic ions in such a way that the obtained spectrosc ' data can be used to inler about the structure 01 the humic substances. A technique that cal) uselul lor that is the multivariate statistics, especially the Principal Components Analysis (PCA).
650 $aspectroscopy
650 $atillage
653 $aÁcido húmico
653 $aRMN
653 $aSoil humic acids
653 $aSolo húmico
700 1 $aMARTIN-NETO, L.
773 $tIn: INTERNATIONAL MEETING OF INTERNATIONAL HUMIC SUBSTANCES SOCIETY. -- IHSS, 12, São Pedro, SP, 2004. Humic substances and soil and water environment. Abstracts...[São Carlos], SP: Embrapa Instrumentação Agropecuária, 2004. p. 46
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