Results
Sorption experiments
Adsorption isotherms from the soils and clay minerals were plotted using the 48-hour equilibrium concentrations. Previous studies have shown sorption past 48 hours is inconsequential to the total amount sorbed.1 Initial phosphate concentrations were 5.3, 50.5, and 101.1 mmol/l in order to represent concentrations normally added to agricultural soils and glyphosate concentrations ranged from 7.75E-3 to 2.96 mmol/l.