title: Adsorption and mobility of acephate in soils.
abstract: The influence of soil properties on the adsorption and mobility of acephate (O, S-dimethylacetylphosphoroamidothioate) was studied. The Freundlich adsorption constant (K) and the distribution coefficient (Kd) were found to be highly correlated (P < 0.001) with the silt + clay content of the soil, both for the studied soils as a whole and for those with organic matter contents below 2%. The mobility of acephate as determined by thin-layer chromatography (saturated flow conditions) was found to be Rf = 1 for all soils except the three with a high silt + clay content, whose Rf was smaller than unity. A study of the acephate mobility in soil-packed columns under unsaturated flow conditions revealed that the highest proportion of the insecticide was retained at the top of the columns; also, the insecticide distribution in the columns and the overall amounts retained and leached were related to the silt+clay content of the soils.
authors.affiliation: Instituto de Recursos Naturales: y Agrobiología de Salamanca, CSIC, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Sánchez-Camazano
authors.forename: J M
authors.initials: JM
authors.lastname: Gonzalez-Pozuelo
authors.forename: M J
authors.initials: MJ
authors.lastname: Sanchez-Martin
authors.forename: T
authors.initials: T
authors.lastname: Crisanto
mesh_terms: D000327:Adsorption; D002855:Chromatography, Thin Layer; D007306:Insecticides / Q000737:chemistry*; D009946:Organothiophosphorus Compounds / Q000737:chemistry*; D063088:Phosphoramides; D012989:Soil Pollutants; D013816:Thermodynamics
chemical_list: D007306:Insecticides; D009946:Organothiophosphorus Compounds; D063088:Phosphoramides; D012989:Soil Pollutants; C001969:acephate