Related Experiment Videos
Time effect on bentazone sorption and degradation in soil
Arnaud Boivin1, Richard Cherrier, Corinne Perrin-Ganier
1Laboratoire Sols et Environnement, UMR INPL/ENSAIA-INRA, Avenue de la Forêt de Haye, BP Vandoeuvre-lès-Nancy cedex, France. arnaud.boivin@ensaia.inpl-nancy.fr
Pest Management Science
|August 17, 2004
Summary
Bentazone weakly sorbs to soils, with its behavior influenced by soil type and time. Over 160 days, extractable bentazone decreased, while bound residues increased, especially in clay soils.
Area of Science:
- Environmental Chemistry
- Soil Science
- Agrochemicals
Background:
- Bentazone is a herbicide with known weak soil sorption and potential for leaching.
- Previous studies indicated limited soil binding and leaching to drainage water.
- Further characterization of bentazone's long-term behavior in soils is needed.
Purpose of the Study:
- To investigate the effect of time on bentazone behavior in different soil types.
- To quantify bentazone degradation, sorption/desorption kinetics, and isotherm changes over time.
- To assess the formation of bound bentazone residues in contrasting soils.
Main Methods:
- Laboratory batch experiments using sandy, loamy, and clay soils treated with bentazone.
- Monitoring of bentazone degradation, sorption/desorption kinetics, and isotherm measurements over 160 days.
- Analysis of extractable and bound bentazone residues at different time points.
Main Results:
- Bentazone mineralization ranged from 2.1% (sandy) to 14% (clay) after 160 days.
- Extractable bentazone decreased significantly over time (e.g., 97% to 12% in clay soil).
- Bound bentazone residues reached up to 65% in clay soil, with some bentazone remaining extractable.
Conclusions:
- Soil type and residence time significantly affect bentazone's environmental fate.
- Bentazone exhibits time-dependent sorption and increased binding in clay soils.
- Long-term studies are crucial for understanding herbicide behavior and persistence in soils.