|Clay, Sharon - SOUTH DAKOTA STATE UNIV|
Submitted to: American Chemical Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: September 15, 2000
Publication Date: N/A
Technical Abstract: Sorption-desorption is arguably the most important process affecting the transport of pesticides through soil since it controls that amount of chemical available for transport. Sorption is usually characterized by determining sorption coefficients on surface soils. Sorption coefficients are then used in solute transport models. A significant limitation in using gsorption coefficients to predict pesticide transport is the spatial variability of surface soil properties over large fields. Another limitation is the spatial variability of soil properties in the soil profile. The effect of changes in soil properties with depth on sorption-desorption of different classes of pesticides, i.e. atrazine, alachlor, sulfometuron methyl, tebuthiuron, and imidacloprid was determined. Results indicate that correlations between pesticide sorption-desorption and soil properties of surface soils cannot necessarily ybe used to characterize pesticide sorption-desorption in subsurface soils.