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Título: | Organic compounds in the environment: soil sorption of acidic pesticides: modeling pH effects. |
Autoria: | SPADOTTO, C. A. HORNSBY, A. G. |
Afiliação: | CLAUDIO APARECIDO SPADOTTO, SGTE A. G. HORNSBY, Soil and Water Science Dep., Univ. of Florida. |
Ano de publicação: | 2003 |
Referência: | Journal of Environmental Quality, Madison, v. 32, p. 949-956, 2003. |
Conteúdo: | A model of acidic pesticide sorption in soils was developed from theoretical modeling and experimental data, which initially considered a combination of a strongly acidic pesticide and a variable-charge soil with high clay content. Contribution of 2,4-D [(2,4-dichlorophenoxy) acetic acid] anionic-form sorption was small when compared with molecular sorption. Dissociation of 2,4-D was not sufficient to explain the variation in Kd as a function of pH. Accessibility of soil organic functional groups able to interact with the pesticide (conformational changes) as a function of organic matter dissociation was proposed to explain the observed differences in sorption. Experimental 2,4-D sorption data and Koc values from literature for flumetsulam [N-(2,6-difluorophenyl)-5-methyl [1,2,4] triazolo [1,5-a] pyrimidine-2-sulfonamide] and sulfentrazone |
Thesagro: | Modelo de simulação Agrotóxico Sorção Ph |
Tipo do material: | Artigo de periódico |
Acesso: | openAccess |
Aparece nas coleções: | Artigo em periódico indexado (CNPMA) |
Arquivos associados a este item:
Arquivo | Tamanho | Formato | |
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SpadottoOrganic6443.pdf | 469,68 kB | Adobe PDF | Visualizar/Abrir |