Abstract
The adsorption of the insecticide chlorpyrifos on the eight most representative soils of Almería Province (Spain) from aqueous solution at 30°C was studied. The adsorption isotherms were derived from batch equilibration experiments. Chlorpyrifos concentrations in the solution phase were determined, after extraction with petroleum ether, by gas liquid chromatography (GLC) with a nitrogen phosphorus detector (NPD) and an electron capture detector (ECD). The adsorption isotherms may be classified as S-type of the Giles classification, and the adsorption constants were calculated with the Freundlich isotherm. Comparisons between adsorption capacities of the soils were done using the X 0.1 values (quantities of chlorpyrifos adsorbed at a actual equilibrium concentration of 0.1 mg · 1 −1) calculated from the Freundlich equation. These X 0.1 values ranged from 22.2 up to 71.1 mg · kg −1. Correlations between X 0.1 values and soil properties show that the adsorption process of chlorpyrifos seems to be conditioned by the electrical conductivity and clay content.
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