Determination of vapor pressure-temperature relationships of current-use pesticides and transformation products.
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 (DeltaH(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.
Goel
Anubha
A
Dept. of Civil and Environmental Engineering, University of Maryland, College Park, Maryland, USA.
McConnell
Laura L
LL
Torrents
Alba
A
D002849:Chromatography, Gas / Q000379:methods; D006843:Hydrocarbons, Chlorinated / Q000737:chemistry; D010575:Pesticides / Q000737:chemistry*; D011312:Pressure; D018570:Risk Assessment / Q000379:methods*; D013696:Temperature; D014835:Volatilization
D006843:Hydrocarbons, Chlorinated; D010575:Pesticides