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Soil transformation of prosulfuron.
Christophe Menniti1, Jean-Pierre Cambon, Jean Bastide
1Centre de Phytopharmacie, FRE CNRS 2605, Université de Perpignan, 52 Avenue de Villeneuve, France.
Journal of Agricultural and Food Chemistry
|May 29, 2003
Summary
The herbicide prosulfuron transforms rapidly in acidic soils, primarily through chemical processes. Researchers identified a new soil metabolite, 2-(3,3,3-trifluoropropyl)phenylsulfonic acid.
Area of Science:
- Environmental Chemistry
- Soil Science
- Agrochemicals
Background:
- Prosulfuron is a widely used herbicide.
- Understanding herbicide transformation in soil is crucial for environmental risk assessment.
- Soil pH is a key factor influencing herbicide persistence and degradation.
Purpose of the Study:
- To investigate the transformation of prosulfuron in different soil types.
- To determine the influence of soil pH on prosulfuron degradation rates.
- To elucidate the primary mechanism of prosulfuron dissipation in acidic soils.
Main Methods:
- Incubation of prosulfuron in sterilized and unsterilized soils across a range of pH values.
- Chemical analysis to identify transformation products and quantify degradation rates.
Main Results:
- Prosulfuron transformation occurred at a high rate in acidic soil conditions.
- Chemical degradation was identified as the main dissipation pathway in sterile acidic soils.
- A novel metabolite, 2-(3,3,3-trifluoropropyl)phenylsulfonic acid, was identified.
Conclusions:
- Soil acidity significantly accelerates prosulfuron transformation.
- Chemical hydrolysis is the dominant degradation mechanism for prosulfuron in acidic soils.
- The identification of 2-(3,3,3-trifluoropropyl)phenylsulfonic acid provides insight into prosulfuron's environmental fate.