| Journal: | Revista brasileira de ciencia do solo |
| Database: | PERIÓDICA |
| System number: | 000314804 |
| ISSN: | 0100-0683 |
| Authors: | Barizon, Robson Rolland Monticelli1 Lavorenti, Arquimedes2 Regitano, Jussara Borges3 Tornisielo, Valdemar Luiz Prata, Fabio4 |
| Institutions: | 1BIOAGRI Laboratorios Ltda, Piracicaba, Sao Paulo. Brasil 2Universidade de Sao Paulo, Escola Superior de Agricultura "Luiz de Queiroz", Piracicaba, Sao Paulo. Brasil 3Universidade de Sao Paulo, Centro de Energia Nuclear na Agricultura, Piracicaba, Sao Paulo. Brasil 4Bayer CropScience Ltda, Sao Paulo. Brasil |
| Year: | 2006 |
| Season: | Jul-Ago |
| Volumen: | 30 |
| Number: | 4 |
| Pages: | 615-623 |
| Country: | Brasil |
| Language: | Portugués |
| Document type: | Nota breve o noticia |
| Approach: | Experimental |
| English abstract | This experiment aimed at the evaluation of imazaquin sorption and transport in soils with different chemical, physical and mineralogical characteristics using batch and miscible-displacement techniques. The experiment was carried out with Neossolo Quartzarênico (RQ), Latossolo Vermelho-Amarelo (LVA) and Latossolo Vermelho distroférrico (LVdf) soils which were air-dried, passed through a 2 mm sieve and followed by chemical, physical and mineralogical characterization. A CaCl2 solution was applied in the miscible displacement experiment for the establishment of a Cl- elution curve that was used as tracer. The curves were adjusted to a model based on the convection-dispersion equation for ideal transport. Then a 14C-imazaquin solution was applied and the elution curves for this molecule obtained. The curve was adjusted to a bicontinuum model that considers non-equilibrium during the transport. In order to obtain the isotherms adjusted by Freundlich equation in the sorption experiment through the batch method, a radiolabel imazaquin solution was used with concentrations varying from 0.67 to 10.72 mmol L-1. The leaching was high for all soils and highest for the RQ soil. The Cl- elution curves were symmetric for all soils and adjusted well to the model that considers the ideal transport, showing that there was non-equilibrium related to the transport. The imazaquin elution curves were asymmetric with extension of the posterior part of the curve and well adjusted to the bicontinuum model, evidencing the occurrence of non-equilibrium in the sorption process. The sorption coefficient determined by the batch method was higher than the miscible displacement method. This result demonstrates that sorption in the leaching process can be overestimated by methods that assume chemical equilibrium during the sorption process |
| Disciplines: | Agrociencias |
| Keyword: | Suelos, Propiedades fisicoquímicas, Mineralogía, Residuos agroindustriales, Herbicidas, Imazaquin, Lixiviación, Toxicidad |
| Keyword: | Agricultural sciences, Soils, Physicochemical properties, Mineralogy, Agroindustrial wastes, Herbicides, Imazaquin, Lixiviation, Toxicity |
| Full text: | Texto completo (Ver HTML) |
