Sorption and desorption of sulfentrazone in Brazilian soils |
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Authors: | Ana Beatriz R.J. Passos Marco Antonio M. Freitas Lívia G. Torres Antonio A. Silva Maria Eliana L.R. Queiroz Cláudio F. Lima |
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Affiliation: | 1. Departamento de Química , Universidade Federal de Vi?osa , Vi?osa , Brazil;2. Departamento de Fitotecnia , Universidade Federal de Vi?osa , Vi?osa , Brazil |
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Abstract: | This study was undertaken to obtain information about the behavior of sulfentrazone in soil by evaluating the sorption and desorption of the herbicide in different Brazilian soils. Batch equilibrium method was used and the samples were analyzed by high performance liquid chromatography. Based on the results obtained from the values of Freundlich constants (Kf), we determined the order of sorption (Haplic Planosol < Red-Yellow Latosol < Red Argisol < Humic Cambisol < Regolitic Neosol) and desorption (Regolitic Neosol < Red Argisol < Humic Cambisol < Haplic Planosol < Red-Yellow Latosol) of sulfentrazone in the soils. The process of pesticide sorption in soils was dependent on the levels of organic matter and clay, while desorption was influenced by the organic matter content and soil pH. Thus, the use of sulfentrazone in soils with low clay content and organic matter (low sorption) increases the probability of contaminating future crops. |
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Keywords: | Herbicide soil characteristics liquid chromatography and Freundlich isotherms |
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