title: Ozone treatment of soil contaminated with aniline and trifluralin.
abstract: Column studies were conducted to determine the ability of ozone to degrade aniline and trifluralin in soil. Ozone rapidly degraded aniline from soil under moist soil conditions, 5% (wt). Removal of 77-98% of [UL-14C]-aniline was observed from soil columns (15 ml, i.d. = 2.5 cm), exposed to 0.6% O(3) (wt) at 200 ml/min after 4 min. Initial ozonation products included nitrosobenzene and nitrobenzene, while further oxidation led to CO(2). Ring-labeled-[UL-14C]-trifluralin removal rates were slower, requiring 30 min to achieve removals of 70-97%. Oxidation and cleavage of the N-propyl groups of trifluralin was observed, affording 2,6-dinitro-4-(trifluoromethyl)-aniline, 2,6-dinitro-N-propyl-4-(trifluoromethyl)-benzamine, and 2,6-dinitro-N-propyl-N-acetonyl-4-(trifluoromethyl)-benzamine. Base solutions revealed that trifluralin was similarly oxidized to CO(2), where 72-83% of the activity recovered comprised 14CO(2). Use of ozone-rich water improved contaminant removal in trifluralin-amended soil columns, but did not improve removal in aniline, pentachloroaniline, hexachlorobenzene amended soil columns, suggesting that ozonated water may improve contaminant removal for reactive contaminants of low solubility.
authors.affiliation: Environmental Engineering Program, Department of Civil and Environmental Engineering, University of Maryland, 1173 Glenn L Martin Hall, College Park, MD 20742-3021, USA.
authors.forename: Anthony C
authors.initials: AC
authors.lastname: Pierpoint
authors.forename: Cathleen J
authors.initials: CJ
authors.lastname: Hapeman
authors.forename: Alba
authors.initials: A
authors.lastname: Torrents
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D002273:Carcinogens / Q000737:chemistry*; D004787:Environmental Pollution / Q000517:prevention & control; D006540:Herbicides / Q000737:chemistry*; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D012995:Solubility; D014274:Trifluralin / Q000737:chemistry*; D014873:Water Pollutants / Q000032:analysis
chemical_list: D000814:Aniline Compounds; D002273:Carcinogens; D006540:Herbicides; D010083:Oxidants, Photochemical; D012989:Soil Pollutants; D014873:Water Pollutants; D010126:Ozone; D014274:Trifluralin; C023650:aniline