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Degradation and Migration of Vinclozolin in Sand and Soil

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Abstract: The migration of the dicarboximide fungicide vinclozolin and its principal degradation products through porous media was experimentally determined by simulating pesticide applications to a 23-30 mesh Ottawa sand and a North Carolina Piedmont, aquic hapludult soil in laboratory columns. The mass of vinclozolin and its degradates were measured in the porous media 24, 168, and 504 hours after fungicide application, varying pore fluid pH and size of simulated rain events. Degradation in the soil was near detection limits under all experimental scenarios. In sand at pH8.8, vinclozolin degraded along two pathways. The degradation to the butenoic acid degradate was faster than the degradation to vinclozolin's enanilide degradate. The presence of the enanilide pathway had not previously been observed in solutions with pH>7, indicating that the presence of particles plays a role in the rate and pathway of vinclozolin degradation. Thus, the direct extrapolation of dicarboximide chemistry from solution studies to agricultural field conditions is not possible without consideration of the soil matrix characteristics.

This research was supported in part by the National Science Foundation's Division of Bioengineering and Environmental Systems. The work has also been funded in part by the U.S. Environmental Protection Agency, and subjected to Agency review and approved for publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
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Citation:Vallero, D. A., J. L. Farnsworth, and J. J. Peirce. Degradation and Migration of Vinclozolin in Sand and Soil. JOURNAL OF ENVIRONMENTAL ENGINEERING 127(10):952-957, (2001).
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Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
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Division: Human Exposure & Atmospheric Sciences Division
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Branch: Human Exposure Analysis Branch
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Product Type: Journal
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Published: 10/01/2001
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Related Entries:
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Bullet Item Methods Development at the Near Lab Ecological Research Area (Nlera) Located in the Neuse River Basin.
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Last Updated on Monday, October 22, 2007
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