Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
Volume 42, Issue 4, Pages 343-349Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03601230701309494
Keywords
vapor pressure; temperature; pesticides; transformation
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Sub-cooled liquid vapor pressures (P-L(0)) 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 (Delta H-vap). While results for chlorothalonil and diazinon were comparable with published values, the measured value for fipronil (1.82 x 10(-6) Pa) is almost an order of magnitude higher than the reported literature value (3.7 x 10(-7) 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.
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