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| Registros recuperados : 513 | |
| 13. |  | SOARES, M. R.; VAZ, C. M. P. Separação e caracterização da fração nanométrica dos minerais dos solos. In: JORNADA CIENTÍFICA - EMBRAPA SÃO CARLOS, 10., 2018, São Carlos, SP. Anais... São Carlos: Embrapa Instrumentação: Embrapa Pecuária Sudeste, 2018. p. 69. Editores técnicos: Daniel Souza Corrêa, Elaine Cristina Paris, Maria Alice Martins, Paulino Ribeiro Villas Boas, Wilson Tadeu Lopes da Silva. (Embrapa Instrumentação. Documentos, 68). (Embrapa Instrumentação. Documentos, 68).| Biblioteca(s): Embrapa Instrumentação. |
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| 15. | | CALBO, A. G.; VAZ, C. M. P. Atmogotejamento com sensores IG: irrigação localizada. In: SIMPÓSIO NACIONAL DE INSTRUMENTAÇÃO AGROPECUÁRIA, 2014, São Carlos, SP Anais do SIAGRO: ciência, inovação e mercado 2014. São Carlos, SP: Embrapa Instrumentação, 2014. p. 333-336. Editores: Carlos Manoel Pedro Vaz, Débora Marcondes Bastos Pereira Milori, Silvio Crestana.| Biblioteca(s): Embrapa Instrumentação. |
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| 17. | | LIMA, J. Z.; VAZ, C. M. P. Avaliação de propriedades físicas de solos arenosos do cerrado sob área nativa, cultivada em coja ou pastagem. In: SIMPÓSIO NACIONAL DE INSTRUMENTAÇÃO AGROPECUÁRIA, 2014, São Carlos, SP Anais do SIAGRO: ciência, inovação e mercado 2014. São Carlos, SP: Embrapa Instrumentação, 2014. p. 625-628. Editores: Carlos Manoel Pedro Vaz, Débora Marcondes Bastos Pereira Milori, Silvio Crestana.| Biblioteca(s): Embrapa Instrumentação. |
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| 19. | | ANDRADE, A. L.; VAZ, C. M. P. Aplicação do modelo de similaridade de Arya e Paris para a estimativa da curva de retenção da água no solo e a água disponível em solos de características diferentes. In: REUNIÃO DA SBPC, 67., 2015, São Carlos, SP. Anais/Resumos... São Carlos, SP: Sociedade brasileira para o progresso da ciência, 2015. 1 p. O resumo apresentado faz parte dos anais da JORNADA CIENTÍFICA - EMBRAPA SÃO CARLOS, 7., 2015, São Carlos, SP.| Biblioteca(s): Embrapa Instrumentação. |
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| 20. | | CRESTANA, S.; VAZ, C. M. P. Tomografia computadorizada aplicada a estudos preliminares da broca da cana. In: REUNIÃO ANUAL DA SBPC, 39., 1987, Brasília, DF. Ciência e Cultura, São Paulo, v.39, n.7, p.336, jul. 1987. Suplemento. Resumos. ref.02-D.1.12.| Biblioteca(s): Embrapa Instrumentação. |
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| Registros recuperados : 513 | |
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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: |
06/11/2007 |
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Autoria: |
VAZ, C. M. P.; MASSAROPI, M. R. C.; MACHADO, S. A. S.; MAZO, L. H.; AVACA, L. A.; CRESTANA, S. |
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Afiliação: |
EMBRAPA-CNPDIA; USP-IQSC. |
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Título: |
Adsorption isotherms of atrazine and 2,4-D in soils using differential pulse polarography. |
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Ano de publicação: |
1996 |
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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. |
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Páginas: |
p. 65. Ref.P-03. |
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Idioma: |
Inglês |
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Conteúdo: |
Polarographic techniques have been used to determine concentrations of many pesticides in different samples like natural waters, soils, vegetables and others. We identified in the literature over 40 active ingredients of pesticides analyzed or studied in some extend by means of polarographic techniques. In comparison with chromatography, the main technique used to analyze pesticides, the polarographic procedures are faster, cheaper and easier to be carried out. Moreover, they can be sucessfully employed for the analysis of colored materials or samples containing dispersed solid particles. The disadvantages are, in many cases, related to lower selectivity and sensitivity. The subject of this owrk is to use differential pulse polarography to determine atrazine and 2,4-D herbicide concentrations in soil samples for adsorption studies. Measurements were carried out in a model 384B Polarographic Analyzer from EG&G PARC, connected with a model 303A EG&G PARC dropping mercury electrode. Adsorption isotherms of atrazine and 2,4-D were obtained on some Brazilian soils using bath equilibrium experiments. The soil samples containing pesticide in concentration varying between 0.1 and 20 microgr.ml-1 were agitated during 24 hours and centrifuged to separate soil solution from the soil material. Concentrations of atrazine were determined directly in these solutions after adjusting pH to 2.3. The herbicide 2,4-D is not electroactive on mercury and has to undergo a nitration procedure to become electroactive... MenosPolarographic techniques have been used to determine concentrations of many pesticides in different samples like natural waters, soils, vegetables and others. We identified in the literature over 40 active ingredients of pesticides analyzed or studied in some extend by means of polarographic techniques. In comparison with chromatography, the main technique used to analyze pesticides, the polarographic procedures are faster, cheaper and easier to be carried out. Moreover, they can be sucessfully employed for the analysis of colored materials or samples containing dispersed solid particles. The disadvantages are, in many cases, related to lower selectivity and sensitivity. The subject of this owrk is to use differential pulse polarography to determine atrazine and 2,4-D herbicide concentrations in soil samples for adsorption studies. Measurements were carried out in a model 384B Polarographic Analyzer from EG&G PARC, connected with a model 303A EG&G PARC dropping mercury electrode. Adsorption isotherms of atrazine and 2,4-D were obtained on some Brazilian soils using bath equilibrium experiments. The soil samples containing pesticide in concentration varying between 0.1 and 20 microgr.ml-1 were agitated during 24 hours and centrifuged to separate soil solution from the soil material. Concentrations of atrazine were determined directly in these solutions after adjusting pH to 2.3. The herbicide 2,4-D is not electroactive on mercury and has to undergo a nitration procedure to be... Mostrar Tudo |
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Palavras-Chave: |
Agricultural instrumentation; Differential pulse polarography; DPP; Herbicidas; Instrumentacao agropecuaria; Isotermos; Isotherms. |
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Thesagro: |
Adsorção; Atrazina; Solo. |
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Thesaurus NAL: |
adsorption; atrazine; herbicides; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02615naa a2200361 a 4500
001 1027078
005 2007-11-06
008 1996 bl --- 0-- u #d
100 1 $aVAZ, C. M. P.
245 $aAdsorption isotherms of atrazine and 2,4-D in soils using differential pulse polarography.
260 $c1996
300 $ap. 65. Ref.P-03.
520 $aPolarographic techniques have been used to determine concentrations of many pesticides in different samples like natural waters, soils, vegetables and others. We identified in the literature over 40 active ingredients of pesticides analyzed or studied in some extend by means of polarographic techniques. In comparison with chromatography, the main technique used to analyze pesticides, the polarographic procedures are faster, cheaper and easier to be carried out. Moreover, they can be sucessfully employed for the analysis of colored materials or samples containing dispersed solid particles. The disadvantages are, in many cases, related to lower selectivity and sensitivity. The subject of this owrk is to use differential pulse polarography to determine atrazine and 2,4-D herbicide concentrations in soil samples for adsorption studies. Measurements were carried out in a model 384B Polarographic Analyzer from EG&G PARC, connected with a model 303A EG&G PARC dropping mercury electrode. Adsorption isotherms of atrazine and 2,4-D were obtained on some Brazilian soils using bath equilibrium experiments. The soil samples containing pesticide in concentration varying between 0.1 and 20 microgr.ml-1 were agitated during 24 hours and centrifuged to separate soil solution from the soil material. Concentrations of atrazine were determined directly in these solutions after adjusting pH to 2.3. The herbicide 2,4-D is not electroactive on mercury and has to undergo a nitration procedure to become electroactive...
650 $aadsorption
650 $aatrazine
650 $aherbicides
650 $asoil
650 $aAdsorção
650 $aAtrazina
650 $aSolo
653 $aAgricultural instrumentation
653 $aDifferential pulse polarography
653 $aDPP
653 $aHerbicidas
653 $aInstrumentacao agropecuaria
653 $aIsotermos
653 $aIsotherms
700 1 $aMASSAROPI, M. R. C.
700 1 $aMACHADO, S. A. S.
700 1 $aMAZO, L. H.
700 1 $aAVACA, L. A.
700 1 $aCRESTANA, S.
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.
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Embrapa Instrumentação (CNPDIA) |
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