Effect of soil characteristics on adsorption and mobility of (14C)diazinon.
Arienzo M. | Crisanto T. | Sanchez Martin M.J. | Sanchez Camazano M.
The adsorption and mobility of diazinon (O,O-diethyl O-2-isopropyl-6-methylpyrimidin-4-yl phosphorothioate) in 25 soils of different physicochemical properties were studied. The adsorption isotherms were found to conform to the Freundlich adsorption equation. Freundlich's constant, K, and the distribution coefficient, Kd, were found to be highly significantly correlated (p < 0.001) with the organic matter (OM) content when all soils or only those with an OM content above 2% were considered. There was also a significant correlation (p < 0.01) of K and Kd with the silt plus clay content of soils with an OM content below 2%. On the basis of the Rf values obtained by TLC, the pesticide was found to be slightly mobile in 80% and immobile in 20% of the soils studied. A study of the pesticide mobility in soil columns under saturated flow conditions showed it to be leached from light soils with low OM contents.
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