Abstract
Sorption−desorption of imidacloprid [1-[(6-chloro-3-pyridinyl)methyl]-N-nitro-2-imidazolidinimine] and metabolites 1-[(6-chloro-3-pyridinyl)methyl]-2-imidazolidinone (imidacloprid−urea), 1-[(6-chloro-3-pyridinyl)methyl]-4,5-dihydro-1H-imidazol-2-amine (imidacloprid−guanidine), and 1-[(6-chloro-3-pyridinyl)methyl]-1H-imidazol-2-amine (imidacloprid−guanidine−olefin) in three soils was determined using the batch equilibration technique with initial concentrations for the four chemicals ranging from 0.05 to 1.5 μg mL-1, which corresponds to a field application rate of 0.2−1.0 kg ha-1. Calculated slopes of the Freundlich sorption isotherms were significantly less than 1. The order of sorption (Kf) was imidacloprid−guanidine > imidacloprid−guanidine−olefin > imidacloprid > imidacloprid−urea in the three soils. Average Kf-oc values were 203, 412, 2740, and 3200 for imidacloprid−urea, imidacloprid, imidacloprid−guanidine−olefin, and imidacloprid−guanidine, respectively. Desorption was hysteretic for all chemicals...
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