title: Sorption and leaching of atrazine and MCPA in natural and peat-amended calcareous soils from Spain.
abstract: The sorption and leaching of atrazine and MCPA (0.02 M CaCl(2) aqueous solution at 25 degrees C) by a calcareous soil from Southeastern Spain, after organic carbon (OC) amendment with a commercial peat (from 0.18% to 4.61% OC), were studied in batch and soil column experiments. Adsorption capacity (K(f)) values, obtained by fitting the experimental data to the Freundlich equation, ranged from 0.24 mg kg(-)(1) for MCPA sorption on the original soil to 5.47 mg kg(-)(1) for atrazine sorption on the peat-amended soil containing 4.61% OC. The breakthrough curves obtained from the step-function soil column experiments indicated that the amount of herbicide adsorbed ranged from 17.5 mg kg(-)(1) for MCPA in the original soil to 331 mg kg(-)(1) for atrazine in the peat-amended soil containing 1.67% OC. The results obtained from the pulse experiments indicate that the mobility of MCPA is much greater than that corresponding to atrazine.
authors.affiliation: Departamento de Química Inorgánica, Universidad de Almería, Almería 04120, Spain.
authors.forename: M M
authors.initials: MM
authors.lastname: Socías-Viciana
authors.forename: M
authors.initials: M
authors.lastname: Fernández-Pérez
authors.forename: M
authors.initials: M
authors.lastname: Villafranca-Sánchez
authors.forename: E
authors.initials: E
authors.lastname: González-Pradas
authors.forename: F
authors.initials: F
authors.lastname: Flores-Céspedes
mesh_terms: D008456:2-Methyl-4-chlorophenoxyacetic Acid / Q000032:analysis*; D000327:Adsorption; D001280:Atrazine / Q000032:analysis*; D002122:Calcium Chloride; D006540:Herbicides / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D013030:Spain
chemical_list: D006540:Herbicides; D012987:Soil; D008456:2-Methyl-4-chlorophenoxyacetic Acid; D002122:Calcium Chloride; D001280:Atrazine