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Adsorption and Desorption of Metolachlor and Metolachlor Metabolites in Vegetated Filter Strip and Cultivated Soil

^a Department of Soil and Crop Science, Texas Agricultural Experiment Station, Texas A&M University, College Station, TX 77843-2142
^b Blackland Research Center, Texas Agricultural Experiment Station, Temple, TX 76502
^c Environmental Stewardship and Regulatory Policy, Syngenta Crop Protection, P.O. Box 18300, Greensboro, NC 27419

View larger version (12K): [in a new window]   Fig. 1. Chemical structure of metolachlor, metolachlor ethanesulfonic acid (ESA), and metolachlor oxanilic acid (OA).

View larger version (30K): [in a new window]   Fig. 2. Adsorption isotherms for metolachlor (MET), metolachlor ethanesulfonic acid (ESA), and metolachlor oxanilic acid (OA) in vegetative filter strip soil (VFSS) and cultivated soil (CS). Each point is the mean and standard deviation of four replications. The error bars do not appear when they are smaller than the symbol for the mean. Calculations are based on the Freundlich equation.

View larger version (29K): [in a new window]   Fig. 3. Desorption isotherms for metolachlor (MET), metolachlor ethanesulfonic acid (ESA), and metolachlor oxanilic acid (OA) in vegetative filter strip soil (VFSS) and cultivated soil (CS). Each point is the mean and standard deviation of four replications. The error bars do not appear when they are smaller than the symbol for the mean. Calculations are based on the Freundlich equation.