Data/hora: 17/06/2024 11:10:29

Biblioteca(s): | Embrapa Meio Ambiente.
Data corrente: | 22/05/2007
Data da última atualização: | 08/06/2015
Autoria: | MATALLO, M. B.; SPADOTTO, C. A.; LUCHINI, L. C.; GOMES, M. A. F.
Afiliação: | Marcus B. Matallo, Centro Experimental Central do Instituto Biológico, Campinas, São Paulo, Brazil; CLAUDIO APARECIDO SPADOTTO, SGTE; Luiz C. Luchini, Centro de Pesquisa e Desenvolvimento em Proteção, Ambiental Instituto Biológico, São Paulo, Brazil; MARCO ANTONIO FERREIRA GOMES, CNPMA.
Título: | Sorption, degradation, and leaching of tebuthiuron and diuron in soil columns.
Ano de publicação: | 2005
Fonte/Imprenta: | Journal of Environmental Science and Health. Part B, Pesticides, Food Contaminants, and Agricultural Wastes, New York, v. B40, n. 1, p. 39-43, 2005.
Idioma: | Inglês
Conteúdo: | A study in small outdoor lisimeters was carried out to determine the leaching of the herbicides tebuthiuron and diuron in different soil types, using undisturbed soil columns. Soil sorption and degradation for both herbicides were also studied in laboratory. The multi-layered AF (Attenuation Factor) model was evaluated for predicting the herbicides leaching in undisturbed soil columns. Tebuthiuron leached in larger amounts than diuron in both soils. Sorption was well represented by linear and Freundlich equations, however parameters from the linear equations were used in the AF model. In general, both herbicides presented very low sorption, with diuron presenting lower values of sorption coefficient than tebuthiuron in the two soils. Chromatographic data had indicated rapid late degradation of diuron and tebuthiuron in both soil types, in two different depths. Simple exponential equation was not able to represent degradation, thus a bi-exponential equation was used, and some model adjusting was needed. Average measured amounts of each herbicide were compared with amounts predicted by the multi-layered-soil AF model. The AF model was able to predict leaching amounts in the sandy soil, especially for diuron, however its performance was not good in the clayey soil.
Palavras-Chave: | Degradação; Deteriorização do solo; Tebutiuron.
Thesagro: | Herbicida; Lixiviação; Modelo matemático; Solo; Sorção.
Thesaurus Nal: | diuron.
Categoria do assunto: | --
Registro original: | Embrapa Meio Ambiente (CNPMA)
Exemplares: | CNPMA - (6857-1) - UPC - AP - DD -  -  - 2005AP_014 - DIS