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Anionic Polyacrylamide Effects on Soil Sorption and Desorption of Metolachlor, Atrazine, 2,4-D, and Picloram

Department of Environ. Sci., Univ. of California, Riverside, CA 92521

View larger version (24K): [in a new window]   Fig. 1. Sorption kinetics of herbicides ([a] metolachlor and atrazine, [b] 2,4-D and picloram) on the natural and PAM-treated Linne clay loam. The PAM application rate was 80 mg kg-1, and initial herbicide concentration was 40 µmol L-1. Each data point is the mean of three replicates and the error bar is its standard deviation.

View larger version (40K): [in a new window]   Fig. 2. Sorption–desorption isotherms of herbicides ([a] metolachlor, [b] atrazine, [c] 2,4-D, [d] picloram) on natural and PAM-treated soils. Each data point is the mean of three replicates and the error bar is its standard deviation. The solid line is the sorption isotherm and the dashed line is the desorption isotherm. The PAM application rate was 80 mg kg-1.

View larger version (23K): [in a new window]   Fig. 3. Effects of PAM application rate on herbicide ([a] metolachlor and atrazine, [b] 2,4-D and picloram) sorption. The initial herbicide concentration was 40 µmol L-1. Each data point is the mean of three replicates and the error bar is its standard deviation.

View larger version (24K): [in a new window]   Fig. 4. Sorption isotherms of herbicides ([a] metolachlor, [b] atrazine, [c] 2,4-D, [d] picloram) on the Linne soil in the presence of oxamic acid. The sorption amount of oxamic acid on the soil was 42 mg kg-1. Each data point is the mean of three replicates and the error bar is its standard deviation.