Results from these studies suggest that dissipation of all eight
compounds occurred to some extent from the model water systems. Quinclorac
was the most persistent compound investigated; this supports results from the
field monitoring studies (Chapter III). In contrast, pendimethalin, propanil, and
thiobencarb were the most readily dissipated compounds from the aquatic
combinations evaluated in this greenhouse study.
For molinate, pendimethalin, and thiobencarb, the bubbling air component
was the most influential factor affecting dissipation; this finding suggests that
volatility was the primary mode of dissipation from aquatic systems. The
remaining five compounds resulted in significant water-type * sediment
interactions which infer the importance of microbial activity and organic matter in
aquatic dissipation processes. Carbofuran resulted in a complex four-way
interaction that could primarily be explained due to pH differences between the