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MEASUREMENT AND MODELING OF THE TRANSPORT OF ENDOCRINE DISRUPTING DICARBOXIMIDES AND DEGRADATION PRODUCTS FROM THE SOIL TO THE LOWER TROPOSPHERE
Citation:
Vallero, D A., L Stockburger, J. L. Farnsworth, AND J. J. Peirce. MEASUREMENT AND MODELING OF THE TRANSPORT OF ENDOCRINE DISRUPTING DICARBOXIMIDES AND DEGRADATION PRODUCTS FROM THE SOIL TO THE LOWER TROPOSPHERE. Presented at Seventh Symposium on the Chemistry and Fate of Modern Pesticides, Lawrence, KS, September 14-16, 1999.
Description:
This research addresses the environmental fate, transport, exposure and potential risks from dicarboximides, a widely used class of agricultural fungicides. Certain dicarboximide fungicides and degradation products have been found to be anti-androgenic; i. e., exposure to these compounds are associated with depressed levels of male hormones in animals. The compounds are semivolatile, so that the gas phase is a potentially important human exposure pathway. Dicarboximides are also strongly lipophilic, so that they have a high potential for bioaccumulation and persistence following their release to the environment. The study addresses the physical and chemical conditions affecting the soil-to-troposphere dicarboximide flux through controlled laboratory chamber experiments. This research extends Duke's research in the flux of oxides of nitrogen to the more complicated mass balance and chemical equilibria of the parent fungicide, vinclozolin, and its three principal degradation products, an enanilide, a butenoic acid, and 3,5-dichoroanaline. The redesigned chamber employs innovative spray application, soil incorporation, and fungicide monitoring and collection systems, which will be described. Other topics will include the protocol for chemical extraction, separation, and detection of dicarboximides, geostatistical techniques for quantitating soil mixing, and water balances. Experimental results will be interpreted and endocrine risk modeling discussed.
This abstract has been reviewed in accordance with the United States Environmental Protection Agency peer and administrative review policies and approved for presentation arid publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.