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Determination of vapor pressure-temperature relationships of current-use pesticides and transformation products
- Sub-cooled liquid vapor pressures (PL0) of current-use organochlorine and organophosphate pesticides (chlorothalonil, chlorpyrifos methyl, diazinon, fipronil) and selected transformation products (chlorpyrifos oxon, heptachlor epoxide, oxychlordane, 3,5,6-trichloro-2-pyridinol) were determined at multiple temperatures using the gas chromatography retention time technique. Results were utilized to determine vapor pressure-temperature relationships and to calculate enthalpies of vaporization (ΔHvap). While results for chlorothalonil and diazinon were comparable with published values, the measured value for fipronil (1.82 x 10⁶ Pa) is almost an order of magnitude higher than the reported literature value (3.7 x10⁷ Pa). The availability of vapor pressure temperature relationships for these chemicals will aid in pesticide risk assessment development and improve the effectiveness of mitigation and remediation efforts.
Goel, A. , McConnell, L.L. , Torrents, A.
vapor pressure , ambient temperature , organochlorine pesticides , organophosphorus pesticides , risk assessment , enthalpy , phase transition
- Includes references
- Journal of environmental science and health. Part B: Pesticides, food contaminants, and agricultural wastes 2007 May, v. 42, no. 4
Journal Articles, USDA Authors, Peer-Reviewed
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.