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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.
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
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