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Using Nonequilibrium Thin-Disc and Batch Equilibrium Techniques to Evaluate Herbicide Sorption

Department of Plant and Soil Sciences, Box 9555, 117 Dorman Hall, Mississippi State University, Mississippi State, MS 39762. Mississippi Agriculture and Forestry Experiment Station #J10257

View larger version (22K): [in a new window]   Fig. 1. Schematic of dual radiolabeled thin-disc flow system (HPLC, high performance liquid chromatography).

View larger version (19K): [in a new window]   Fig. 2. Influence of initial solution concentration on percentage of imazaquin removed from solution. The soil was a Demopolis silt loam, pH 7.6, with 62 g kg-1 organic matter; solution to soil ratio = 2:1 in 5.0 mM CaCl2.

View larger version (50K): [in a new window]   Fig. 3. Influence of theoretical initial atrazine and imazaquin solution concentration on the contribution of rapid sorption (5 min) and gradual sorption (24 h) to the total removal of atrazine from solution. The soil was a Demopolis silt loam, pH 7.6, with 62 g kg-1 organic matter; solution to soil ratio = 2:1 in 5.0 mM CaCl2.

View larger version (20K): [in a new window]   Fig. 4. Breakthrough concentration curves of 3H-water and 14C-atrazine in inline filter apparatus without soil (A) and with 3.0 g soil (B). The soil was a Demopolis silt loam, pH 7.6, with 62 g kg-1 organic matter; flow velocity was 1.0 mL min-1 in 5.0 mM CaCl2.

View larger version (23K): [in a new window]   Fig. 5. Breakthrough concentration curves of 3H-water (A) and 14C-atrazine (B) in inline filter apparatus with soil. The soil was a Demopolis silt loam, pH 7.6, with 62 g kg-1 organic matter; flow velocity was 1.0 mL min-1 in 5.0 mM CaCl2.

View larger version (23K): [in a new window]   Fig. 6. Breakthrough concentration curves of 3H-water and 14C-imazaquin in inline filter apparatus without soil (A) and with 3.0 g soil (B), averaged over three replications. The soil was a Demopolis silt loam, pH 7.6, with 62 g kg-1 organic matter; flow velocity was 1.0 mL min-1 in 5.0 mM CaCl2.

View larger version (26K): [in a new window]   Fig. 7. Relationship of cumulative percentage of 3H-water on cumulative percentage of 14C-atrazine or 14C-imazaquin observed in the soil solution effluent. The soil was a Demopolis silt loam, pH 7.6, with 62 g kg-1 organic matter; flow velocity was 1.0 mL min-1 in 5.0 mM CaCl2.

View larger version (16K): [in a new window]   Fig. 8. Influence of effluent volume on atrazine solution and soil concentration. The soil was a Demopolis silt loam, pH 7.6, with 62 g kg-1 organic matter; flow velocity was 1.0 mL min-1 in 5.0 mM CaCl2.