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V3 No2 390 399 2002 Journal of Environmental Protection and Ecology Agricultural pollution ADSORPTION-DESORPTION AND MOBILITY OF 14C- ETHOFUMESATE IN MOROCCAN SOILS A. SATRALLAHa, A. DAHCHOURa*, M. BADRAOUIa, E. ESSASSIb, M. J. SANCHEZ-MARTINc a Institut Agronomique et Veterinaire Hassan II. B. P. 6202 Rabat-Instituts, Morocco E-mail: firstname.lastname@example.org b Faculti des Sciences, Departement de Chimie, 1014 Ibn Batouta Avenue, Rabat, Morocco c Instituto de Recursos Naturales y Agrobiologia, CSIC, Cordel de Merinas 40-52, E-37071 Salamanca, Spain Abstract. A study was made of the adsorption-desorption and mobility of the herbicide ethofumesate (2-ethoxy-2,3-dihydro-3,3-dimethylbenzofuran-5-ylmethane sulfonate) in fourteen agricultural soils from different areas of Morocco. Adsorption isotherms were obtained using the batch equilibrium technique and mobility was studied using soil thin layer chromatography. The adsorption and desorption isotherms fit the Freundlich equation, the Kf values ranged between 0.61 and 4.73 and the nf values were always lower than unity. The desorption isotherms display positive hysteresis in all soils and the greatest hysteresis was seen in soil with the highest organic matter content. Adsorption constants and distribution coefficients were found to be significantly correlated (/?<0.01) with the organic matter content of the soils. According to the determination coefficient, r2, organic matter would account for 60% of the variance in adsorption. On the basis to the Rf values obtained, ethofumesate is slightly mobile in 28% and moderately mobile in 72% of the soils studied. The results obtained indicate the importance of the organic matter in the adsorption-desorption and mobility of ethofumesate in the Moroccan soils studied. Keywords: adsorption, desorption, mobility TLC, 14C-ethofumesate, Moroccan soils.
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