Acifluorfen Sorption and Sroption Kinetics in Soil

Document Type

Article

Publication Date

1-1-1997

Abstract

Factors which influence kinetics of sorption for acifluorfen, a postemergence herbicide, in soil were evaluated. Twelve soils of varying characteristics were used in this study. Sorption kinetics experiments with 5.86 μM. 14C-labeled (19.6 Bq mL-1) acifluorfen were conducted for equilibration times up to 96 h. Sorption was rapid for all soils, and most soils reached a pseudo-equilibrium after 24-48 h of equilibration. Apparent sorption increased at later times, possibly reflecting sorption of acifluorfen or metabolites, since acifluorfen is subject to biotransformation. Further investigation comparing sorption at 4 and 25 °C indicated that microbial metabolism was occurring for some soils at equilibration times longer than 24-48 h. Aminoacifluorfen was observed in methanol extracts of soils equilibrated 96 h. Soils were equilibrated for 24 h with 14C-labeled acifluorfen (2.6-65.8 μM, 19.5 Bq mL-1) to obtain sorption isotherms. Capacity for acifluorfen sorption in these soils generally increased with increasing soil organic carbon content, cation exchange capacity, and soil acidity.

Publication Source (Journal or Book title)

Journal of Agricultural and Food Chemistry

First Page

286

Last Page

293

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