You are here:
PHOTOLYSIS OF SMOKE DYES ON SOILS
Citation:
Adams, R., E. Weber, AND G. Baughman. PHOTOLYSIS OF SMOKE DYES ON SOILS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-94/285 (NTIS PB94191111), 1994.
Description:
Photolysis of an azo, a quinophthalone, and several anthraquinone smoke dyes was studied on soil surfaces. nitially, rapid photodegradation of each dye occurred, followed by a period of much slower rate of loss, indicating that the remaining fraction of the dye was photochemically protected. he average mean depths of photolysis ranged from 0.33 to 0.68 mm for outdoor studies and from 0.42 to 0.73 for lab studies. he magnitude of the mean depth of photolysis suggests that photodegradation of the dyes occurs through indirect photochemical processes. hotolysis products for only two of the dyes could be identified. hotolysis of Disperse Red 9 resulted in the formation of 1-aminoanthraquinone, whereas Solvent Yellow 33 photo-degraded to give 2-carboxyquinoline and phthalic anhydride. eaction mechanisms involving sensitized photo-oxidation by single oxygen are consistent with the formation of these reaction products.
