title: Sorption and desorption of sulfentrazone in Brazilian soils.
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.
authors: Departamento de Química, Universidade Federal de Viçosa, Viçosa, Brazil. anabiapassos@yahoo.com.br
authors: Ana Beatriz R J
authors: AB
authors: Passos
authors: Marco Antonio M
authors: MA
authors: Freitas
authors: Lívia G
authors: LG
authors: Torres
authors: Antonio A
authors: AA
authors: Silva
authors: Maria Eliana L R
authors: ME
authors: Queiroz
authors: Cláudio F
authors: CF
authors: Lima
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates; D001938:Brazil; D002851:Chromatography, High Pressure Liquid; D000077215:Clay; D006540:Herbicides / Q000032:analysis / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry; D013449:Sulfonamides / Q000032:analysis / Q000737:chemistry*; D014230:Triazoles / Q000032:analysis / Q000737:chemistry*
chemical_list: D000538:Aluminum Silicates; D006540:Herbicides; D012987:Soil; D012989:Soil Pollutants; D013449:Sulfonamides; D014230:Triazoles; C475571:N-(2,4-dichloro-5-(4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenyl)methanesulfonamide; D000077215:Clay