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PHOTOLYSIS OF ARYL KETONES WITH VARYING VAPOR PRESSURE ON SOIL
Citation:
Kieatiwong, S. AND G. Miller. PHOTOLYSIS OF ARYL KETONES WITH VARYING VAPOR PRESSURE ON SOIL. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-94/478 (NTIS PB95136826), 1992.
Description:
The photolysis of a series of aryl ketones on air-dried soil surfaces was examined to establish whether vapor transport has an effect on the rate and extent of photolysis. f vapor transport were significant on light-exposed soils, then differences in the observed photolysis rate profiles would be expected, with the compounds having higher vapor pressures exhibiting the greatest photolysis. he aryl ketones, including hexanophenone, dodecanophenone, octanophenone, hexadecanophenone, and octadecanophenone, had nearly identical photolysis rates in solution exposed to sunlamps (Xmax 310 nm). he vapor pressures of these five compounds (25 OC) were estimated by a capillary gas chromatographic method and varied from 8.7 X 10-3 to 8.4 X 10-8 torr. he compounds were irradiated for 15 d on an air-dried sandy loam soil surface. he photolysis rate profiles of the four aryl ketones with vapor pressures from 1.3 X 10-3 to 8.4 X 10-8 torr were identical within experimental error, whereas the most volatile congener, hexanophenone, showed approximately 10% greater loss. olatilization of hexanophenone appears to have caused the compound to move into the light-exposed soil surface to a greater extent than the other compounds. hese results suggest that vaporization is not important for loss or transport of the compounds with vapor pressures less than 1.3 X 10-3 torr on air-dried soils within the 15-d irradiation.
