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Registro Completo |
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
25/06/2003 |
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Data da última atualização: |
25/10/2018 |
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Autoria: |
KOGAN, M.; METZ, A.; ORTEGA, R. |
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Afiliação: |
MARCELO KOGAN, Pontificia Universidad Católica de Chile/Facultad de Agronomía e Ingeniería Florestal/Departamento de Ciencias Vegetales; ALEJANDRA METZ, Pontificia Universidad Católica de Chile/Facultad de Agronomía e Ingeniería Florestal/Departamento de Ciencias Vegetales; RODRIGO ORTEGA, Pontificia Universidad Católica de Chile/Facultad de Agronomía e Ingeniería Florestal/Departamento de Ciencias Vegetales. |
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Título: |
Adsorption of glyphosate in Chilean soils and its relationship with unoccupied phosphate binding sites. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 38, n. 4, p. 513-519, abr. 2003 |
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Idioma: |
Inglês |
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Notas: |
Título em português: Adsorção de glifosato em solos chilenos e sua relação com sítios de adsorção disponíveis para adsorção de fosfato. |
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Conteúdo: |
The objective of this work was to investigate glyphosate adsorption by soils and its relationship with unoccupied binding sites for phosphate adsorption. Soil samples of three Chilean soils series - Valdivia (Andisol), Clarillo (Inceptisol) and Chicureo (Vertisol) - were incubated with different herbicide concentrations. Glyphosate remaining in solution was determined by adjusting a HPLC method with a UV detector. Experimental maximum adsorption capacity were 15,000, 14,300 and 4,700 mg g-1 for Valdivia, Clarillo, and Chicureo soils, respectively. Linear, Freundlich, and Langmuir models were used to describe glyphosate adsorption. Isotherms describing glyphosate adsorption differed among soils. Maximum adjusted adsorption capacity with the Langmuir model was 231,884, 17,874 and 5,670 mg g-1 for Valdivia, Clarillo, and Chicureo soils, respectively. Glyphosate adsorption on the Valdivia soil showed a linear behavior at the range of concentrations used and none of the adjusted models became asymptotic. The high glyphosate adsorption capacity of the Valdivia soil was probably a result of its high exchangeable Al, extractable Fe, and alophan and imogolite clay type. Adsorption was very much related to phosphate dynamics in the Valdivia soil, which showed the larger unoccupied phosphate binding sites. However relationship between unoccupied phosphate binding sites and glyphosate adsorption in the other two soils (Clarillo and Chicureo) was not clear. |
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Palavras-Chave: |
dosage effects; efeito de dosagem; herbicide; modelos. |
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Thesagro: |
Herbicida. |
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Thesaurus Nal: |
models. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/24573/1/v38n04_513.pdf
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Marc: |
LEADER 02255naa a2200229 a 4500
001 1108986
005 2018-10-25
008 2003 bl uuuu u00u1 u #d
100 1 $aKOGAN, M.
245 $aAdsorption of glyphosate in Chilean soils and its relationship with unoccupied phosphate binding sites.
260 $c2003
500 $aTítulo em português: Adsorção de glifosato em solos chilenos e sua relação com sítios de adsorção disponíveis para adsorção de fosfato.
520 $aThe objective of this work was to investigate glyphosate adsorption by soils and its relationship with unoccupied binding sites for phosphate adsorption. Soil samples of three Chilean soils series - Valdivia (Andisol), Clarillo (Inceptisol) and Chicureo (Vertisol) - were incubated with different herbicide concentrations. Glyphosate remaining in solution was determined by adjusting a HPLC method with a UV detector. Experimental maximum adsorption capacity were 15,000, 14,300 and 4,700 mg g-1 for Valdivia, Clarillo, and Chicureo soils, respectively. Linear, Freundlich, and Langmuir models were used to describe glyphosate adsorption. Isotherms describing glyphosate adsorption differed among soils. Maximum adjusted adsorption capacity with the Langmuir model was 231,884, 17,874 and 5,670 mg g-1 for Valdivia, Clarillo, and Chicureo soils, respectively. Glyphosate adsorption on the Valdivia soil showed a linear behavior at the range of concentrations used and none of the adjusted models became asymptotic. The high glyphosate adsorption capacity of the Valdivia soil was probably a result of its high exchangeable Al, extractable Fe, and alophan and imogolite clay type. Adsorption was very much related to phosphate dynamics in the Valdivia soil, which showed the larger unoccupied phosphate binding sites. However relationship between unoccupied phosphate binding sites and glyphosate adsorption in the other two soils (Clarillo and Chicureo) was not clear.
650 $amodels
650 $aHerbicida
653 $adosage effects
653 $aefeito de dosagem
653 $aherbicide
653 $amodelos
700 1 $aMETZ, A.
700 1 $aORTEGA, R.
773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 38, n. 4, p. 513-519, abr. 2003
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Embrapa Unidades Centrais (AI-SEDE) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
23/11/2017 |
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Data da última atualização: |
23/11/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
SIQUEIRA, G. L. de A. de; HORNUNG, P. S.; SILVEIRA, A. C. da; LAZZAROTTO, S. R. da S.; CORDOBA, L. do P.; SCHNITZLER, E.; LAZZAROTTO, M. |
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Afiliação: |
Geisa Liandra de Andrade de Siqueira, UEPG; Polyanna Silveira Hornung, UFPR; Ana Claudia da Silveira, UFPR; Simone Rosa da Silveira Lazzarotto, UEPG; Layse do Prado Cordoba, UFPR; Egon Schnitzler, UEPG; MARCELO LAZZAROTTO, CNPF. |
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Título: |
Impact of treatment with HCL/alcoholic in the modification of corn starch. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Journal of Thermal Analysis and Calorimetry, v. 129, n. 3, p. 1705-1713, Dec. 2017. |
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DOI: |
10.1007/s10973-017-6299-z |
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Idioma: |
Inglês |
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Conteúdo: |
The physical, chemical, or enzymatic modified starches are well suited for industrial applications. Acid hydrolysis changes the physicochemical properties without impairing the granular structure of starch. The acid hydrolysis in alcoholic solution can recover the granule starches after modification. Starch, the most abundant carbohydrate in grains, roots and tubers, is composed by amylose and amylopectin. Corn starch represents 85% of the global starch market. The aim of this study was to evaluate the effects of soft acid, acid?ethanol and acid methanol solutions, considering its application in the paper industry. One sample remained as native. The other six samples were modified with acid, acid?ethanol and acid? methanol solutions, at concentrations of 0.1 and 0.5 mol L-1 (hydrochloric acid). The acid treatment changed the thermal (TG) and rheological (RVA) properties of the corn starch. The TG/DTG results showed shifted (up to 8 C) stability temperature ranges for the samples treated with a higher concentration of HCl in ethanol and methanol solutions. The RVA results for final viscosity of the treated samples showed an intense reduction of 1405 cP related to the native sample. DSC curves demonstrated that the treatments slightly modified the gelatinization behavior of the starch. The micrographs showed small changes in granules average diameter size after the modification process. Acid hydrolysis did not change the crystalline pattern of corn starch, and its relative crystallinity was slightly affected. According to the results obtained for the acid/alcohol, modified starches present suitable properties for their application in the paper industry. MenosThe physical, chemical, or enzymatic modified starches are well suited for industrial applications. Acid hydrolysis changes the physicochemical properties without impairing the granular structure of starch. The acid hydrolysis in alcoholic solution can recover the granule starches after modification. Starch, the most abundant carbohydrate in grains, roots and tubers, is composed by amylose and amylopectin. Corn starch represents 85% of the global starch market. The aim of this study was to evaluate the effects of soft acid, acid?ethanol and acid methanol solutions, considering its application in the paper industry. One sample remained as native. The other six samples were modified with acid, acid?ethanol and acid? methanol solutions, at concentrations of 0.1 and 0.5 mol L-1 (hydrochloric acid). The acid treatment changed the thermal (TG) and rheological (RVA) properties of the corn starch. The TG/DTG results showed shifted (up to 8 C) stability temperature ranges for the samples treated with a higher concentration of HCl in ethanol and methanol solutions. The RVA results for final viscosity of the treated samples showed an intense reduction of 1405 cP related to the native sample. DSC curves demonstrated that the treatments slightly modified the gelatinization behavior of the starch. The micrographs showed small changes in granules average diameter size after the modification process. Acid hydrolysis did not change the crystalline pattern of corn starch, and its relative cry... Mostrar Tudo |
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Palavras-Chave: |
Análise térmica; DSC; RVA; SEM; TG/DTG; XRD. |
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Thesagro: |
Amido; Milho. |
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Thesaurus NAL: |
Corn starch; Modified starch; Thermal analysis. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02617naa a2200337 a 4500
001 2080584
005 2017-11-23
008 2017 bl uuuu u00u1 u #d
024 7 $a10.1007/s10973-017-6299-z$2DOI
100 1 $aSIQUEIRA, G. L. de A. de
245 $aImpact of treatment with HCL/alcoholic in the modification of corn starch.$h[electronic resource]
260 $c2017
520 $aThe physical, chemical, or enzymatic modified starches are well suited for industrial applications. Acid hydrolysis changes the physicochemical properties without impairing the granular structure of starch. The acid hydrolysis in alcoholic solution can recover the granule starches after modification. Starch, the most abundant carbohydrate in grains, roots and tubers, is composed by amylose and amylopectin. Corn starch represents 85% of the global starch market. The aim of this study was to evaluate the effects of soft acid, acid?ethanol and acid methanol solutions, considering its application in the paper industry. One sample remained as native. The other six samples were modified with acid, acid?ethanol and acid? methanol solutions, at concentrations of 0.1 and 0.5 mol L-1 (hydrochloric acid). The acid treatment changed the thermal (TG) and rheological (RVA) properties of the corn starch. The TG/DTG results showed shifted (up to 8 C) stability temperature ranges for the samples treated with a higher concentration of HCl in ethanol and methanol solutions. The RVA results for final viscosity of the treated samples showed an intense reduction of 1405 cP related to the native sample. DSC curves demonstrated that the treatments slightly modified the gelatinization behavior of the starch. The micrographs showed small changes in granules average diameter size after the modification process. Acid hydrolysis did not change the crystalline pattern of corn starch, and its relative crystallinity was slightly affected. According to the results obtained for the acid/alcohol, modified starches present suitable properties for their application in the paper industry.
650 $aCorn starch
650 $aModified starch
650 $aThermal analysis
650 $aAmido
650 $aMilho
653 $aAnálise térmica
653 $aDSC
653 $aRVA
653 $aSEM
653 $aTG/DTG
653 $aXRD
700 1 $aHORNUNG, P. S.
700 1 $aSILVEIRA, A. C. da
700 1 $aLAZZAROTTO, S. R. da S.
700 1 $aCORDOBA, L. do P.
700 1 $aSCHNITZLER, E.
700 1 $aLAZZAROTTO, M.
773 $tJournal of Thermal Analysis and Calorimetry$gv. 129, n. 3, p. 1705-1713, Dec. 2017.
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