ARS | Publication request: ADSORPTION AND DEGRADATION OF ISOXAFLUTOLE IN SOIL

Submitted to: Soil Science Society of America Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: September 25, 1999
Publication Date: N/A

Technical Abstract: Isoxaflutole is a new herbicide being marketed for grass and broadleaf weed control in corn. The parent compound rapidly degrades to form the bioactive metabolite, diketonitrile. A kinetic study was performed to determine the relative sorption ratios of isoxaflutole and diketonitrile over a 48 h period, using radiolabeled material. Adsorption isotherms were conducted on four Illinois soils with a range of organic matter contents, but similar pH. TLC and LSC were used to quantify the concentrations of isoxaflutole and diketonitrile in solution and extracted from the soil. Degradation of isoxaflutole was measured over time in soil biometers with a CO2 trap to determine mineralization. Soils were maintained at several moisture regimes throughout the degradation study. Transformation to diketonitrile and the more stable metabolite, a benzoic acid derivative, was also measured with TLC.