| |
|
|
| Registros recuperados : 37 | |
| Registros recuperados : 37 | |
|
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Instrumentação. |
|
Data corrente: |
22/12/1999 |
|
Data da última atualização: |
22/12/1999 |
|
Autoria: |
TRAGHETTA, D. G.; SPOSITO, G.; VIEIRA, E. M.; MACHADO, S. A. S.; MAZO, L. H.; AVACA, L. A.; VAZ, C. M. P.; CRESTANA, S.; MARTIN NETO, L. |
|
Afiliação: |
USP-IFSC; University of California, Berkeley; USP-IQSC; EMBRAPA-CNPDIA. |
|
Título: |
Degradation and mechanism of sorption of atrazine in soil organic matter fractions. |
|
Ano de publicação: |
1996 |
|
Fonte/Imprenta: |
In: IUPAC GARP WORKSHOP PN PESTICIDES: USES AND ENVIRONMENTAL SAFETY IN LATIN AMERICA, Oct. 1996, Sao Paulo, SP. Book of abstracts... Sao Paulo; Sociedade Brasileira de Quimica, 1996. |
|
Páginas: |
p. 70. Ref.P-08. |
|
Idioma: |
Inglês |
|
Conteúdo: |
The herbicide atrazine (2-chloro-4-ethylamino-6-isopropilamino-1,3,5-triazine) has been widely used in Brazil and the world, mainly for controlling weeds in corn culture. Its half-life varies between 1,5 month and 5 years. Among the soil fractions, the organic matter is the most important for sorption of non-polar herbicides. For atrazine (AT), many authors has shown that humic substances are the principal site for its adsorption on soil and therefore they play an important role in the degradation process. In this work quantitative and qualitative analysis about sorption and degradation of atrazine on soil organic matter components (humic acids-HA and fulvic acids-FA) were performed extending previous studies [1]. Spectroscopic techniques used were electronic paramagnetic resonance (EPR), electronic absorption UV-visible and infrared (FTIR). For quantitative analysis an electroanalytical method, differential pulse polarography (DPP) was used. The humic substances has shown to be catalysts in degradation of atrazine. Spectroscopic data (EPR,FTIR) showed that sorption of atrazine occurred on humic and fulvic acids, from tropical sites, through hydrogen bond and proton-transfer, but no through electron-transfer as generally suggested in literature of s-triazines [2]. At low pH's, near pKa atrazine (1,68), degradation of AT to hydroxy-atrazine (OH-AT) is relatively high, while in higher pH's many occur degradation through proton-transfer mechanism (Bronsted acidity) between atrazine and humic substances... MenosThe herbicide atrazine (2-chloro-4-ethylamino-6-isopropilamino-1,3,5-triazine) has been widely used in Brazil and the world, mainly for controlling weeds in corn culture. Its half-life varies between 1,5 month and 5 years. Among the soil fractions, the organic matter is the most important for sorption of non-polar herbicides. For atrazine (AT), many authors has shown that humic substances are the principal site for its adsorption on soil and therefore they play an important role in the degradation process. In this work quantitative and qualitative analysis about sorption and degradation of atrazine on soil organic matter components (humic acids-HA and fulvic acids-FA) were performed extending previous studies [1]. Spectroscopic techniques used were electronic paramagnetic resonance (EPR), electronic absorption UV-visible and infrared (FTIR). For quantitative analysis an electroanalytical method, differential pulse polarography (DPP) was used. The humic substances has shown to be catalysts in degradation of atrazine. Spectroscopic data (EPR,FTIR) showed that sorption of atrazine occurred on humic and fulvic acids, from tropical sites, through hydrogen bond and proton-transfer, but no through electron-transfer as generally suggested in literature of s-triazines [2]. At low pH's, near pKa atrazine (1,68), degradation of AT to hydroxy-atrazine (OH-AT) is relatively high, while in higher pH's many occur degradation through proton-transfer mechanism (Bronsted acidity) between atra... Mostrar Tudo |
|
Palavras-Chave: |
Agricultural instrumentation; Degradacao; Herbicidas; Instrumentacao agropecuaria. |
|
Thesagro: |
Atrazina; Matéria Orgânica; Solo; Sorção. |
|
Thesaurus NAL: |
atrazine; degradation; herbicides; organic matter; soil; sorption. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02699naa a2200397 a 4500
001 1027070
005 1999-12-22
008 1996 bl --- 0-- u #d
100 1 $aTRAGHETTA, D. G.
245 $aDegradation and mechanism of sorption of atrazine in soil organic matter fractions.
260 $c1996
300 $ap. 70. Ref.P-08.
520 $aThe herbicide atrazine (2-chloro-4-ethylamino-6-isopropilamino-1,3,5-triazine) has been widely used in Brazil and the world, mainly for controlling weeds in corn culture. Its half-life varies between 1,5 month and 5 years. Among the soil fractions, the organic matter is the most important for sorption of non-polar herbicides. For atrazine (AT), many authors has shown that humic substances are the principal site for its adsorption on soil and therefore they play an important role in the degradation process. In this work quantitative and qualitative analysis about sorption and degradation of atrazine on soil organic matter components (humic acids-HA and fulvic acids-FA) were performed extending previous studies [1]. Spectroscopic techniques used were electronic paramagnetic resonance (EPR), electronic absorption UV-visible and infrared (FTIR). For quantitative analysis an electroanalytical method, differential pulse polarography (DPP) was used. The humic substances has shown to be catalysts in degradation of atrazine. Spectroscopic data (EPR,FTIR) showed that sorption of atrazine occurred on humic and fulvic acids, from tropical sites, through hydrogen bond and proton-transfer, but no through electron-transfer as generally suggested in literature of s-triazines [2]. At low pH's, near pKa atrazine (1,68), degradation of AT to hydroxy-atrazine (OH-AT) is relatively high, while in higher pH's many occur degradation through proton-transfer mechanism (Bronsted acidity) between atrazine and humic substances...
650 $aatrazine
650 $adegradation
650 $aherbicides
650 $aorganic matter
650 $asoil
650 $asorption
650 $aAtrazina
650 $aMatéria Orgânica
650 $aSolo
650 $aSorção
653 $aAgricultural instrumentation
653 $aDegradacao
653 $aHerbicidas
653 $aInstrumentacao agropecuaria
700 1 $aSPOSITO, G.
700 1 $aVIEIRA, E. M.
700 1 $aMACHADO, S. A. S.
700 1 $aMAZO, L. H.
700 1 $aAVACA, L. A.
700 1 $aVAZ, C. M. P.
700 1 $aCRESTANA, S.
700 1 $aMARTIN NETO, L.
773 $tIn: IUPAC GARP WORKSHOP PN PESTICIDES: USES AND ENVIRONMENTAL SAFETY IN LATIN AMERICA, Oct. 1996, Sao Paulo, SP. Book of abstracts... Sao Paulo; Sociedade Brasileira de Quimica, 1996.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Instrumentação (CNPDIA) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
