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DEGRADATION AND MIGRATION OF VINCLOZOLIN IN SAND AND SOIL
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).
Impact/Purpose:
1) Develop methods of ecological exposure (e.g. rapid , sensitive analytical screening methods for a select list of antibiotics widely used in agriculture primarily in CAFOs (confined animal feeding operations).
2) Do Measurements & Provide data for multicompartment models of fate and transport.
3) Study biomagnification of specific chemicals and toxic metals.
4) Study specific pharmaceuticals:
*Determine the routes of entry and the impact of environmental factors such as rainfall on the movement and survivorability of selected antimicrobials in the environment.
*Determine if the entry of agriculture based antibiotics into the environment contributes to resistance in bacterial populations.
*Determine the contribution from municipal waste water treatment plants to antibiotic loading in the environment.
5) Develop methods for the analysis of alkylphenol ethoxylates and derivatives.
Description:
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.