The adsorption and desorption of imazapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1 H -imidazol-2-yl]-3-pyridinecarboxylic acid, by six soils were studied. Adsorption isotherms conformed to the Freundlich equation. A multiple regression analysis indicated that K f(ads) values were better correlated if cation exchange capacity and pH ( r = 0.984) were simultaneously taken into account. The results show that the herbicide adsorption is strongly affected by the pH and the charge of the adsorbing component. The organic matter is effective in imazapyr retention, but only at pH <5. Enhanced adsorption was observed in amorphous iron oxide, most likely because of a ligand exchange process.
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Pusino et al. (1997) studied this question.
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