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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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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Clima Temperado. Para informações adicionais entre em contato com cpact.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Clima Temperado. |
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Data corrente: |
18/01/2010 |
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Data da última atualização: |
17/10/2011 |
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Autoria: |
LOOSE, L. H.; HELDWEIN, A. B.; RADONS, S. Z.; DALCIN, J. S.; ÁVILA, A. G. V. S. de. |
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Título: |
Saldo de radiação em dosséis de girassol em função da radiação solar global. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
In: REUNIÃO NACIONAL DE PESQUISA DO GIRASSOL, 18., SIMPÓSIO NACIONAL SOBRE A CULTURA DO GIRASSOL, 6., 2009. Pelotas. Anais... Pelotas: Embrapa Clima Temperado, 2009. p. 295-302. Editado por Ana Claudia Barneche de Oliveira, Ana Paula Afonso Scheneid da Rosa e Márcia Vizzotto. |
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ISBN: |
978-85-85941-39-0 |
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Idioma: |
Português |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00733naa a2200169 a 4500
001 1747228
005 2011-10-17
008 2009 bl uuuu u00u1 u #d
020 $a978-85-85941-39-0
100 1 $aLOOSE, L. H.
245 $aSaldo de radiação em dosséis de girassol em função da radiação solar global.
260 $c2009
700 1 $aHELDWEIN, A. B.
700 1 $aRADONS, S. Z.
700 1 $aDALCIN, J. S.
700 1 $aÁVILA, A. G. V. S. de
773 $tIn: REUNIÃO NACIONAL DE PESQUISA DO GIRASSOL, 18., SIMPÓSIO NACIONAL SOBRE A CULTURA DO GIRASSOL, 6., 2009. Pelotas. Anais... Pelotas: Embrapa Clima Temperado, 2009. p. 295-302. Editado por Ana Claudia Barneche de Oliveira, Ana Paula Afonso Scheneid da Rosa e Márcia Vizzotto.
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