Sorption and desorption of bicyclopyrone on soils

Abstract

Bicyclopyrone is an herbicide that is marketed for the control of herbicide-resistant weeds. However, there is a lack of extensive data on its sorption and factors that control its sorption in the soil system. In this study, we evaluated a series of 25 different soils, with a variety of properties to determine if an empirical relationship could be developed to predict the sorption coefficient for bicyclopyrone. Overall, there were no statistically significant relationships observed with organic carbon, cation exchange capacity, or clay content. There was a moderate negative correlation with soil pH (R = −.61). Additionally, Freundlich isotherm analysis suggests that the partitioning coefficient (KD) value could adequately characterize the sorption behavior for the range of soils evaluated here.