U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 close



Research
                Research Home
                            National Programs
                            Research Projects
                            Scientific Manuscripts
                            International Engagement
                            Scientific Software/Models
                            Databases and Datasets
                            Office of Scientific Quality Review
            Media
                News & Features
                            Multimedia
                            Briefing Room
                            Down on the Farm
                            Press Room
                            Science in Your Shopping Cart
                            Scientific Discoveries
                            Tellus
                            Under the Microscope
            About ARS
                About ARS Home
                            Staff Directory
                            Labs and Research Centers (Map)
                            Headquarter Offices
                            Organizational Chart
                            Employee Services (REE Employees Only)
                            Office of Outreach, Diversity, and Equal Opportunity
            Work With Us
                Work With Us Home
                            ARS Vacancies at USAJOBS
                            Careers at ARS Information
                            Scientific Collaborations
                            Extramural Agreements
                            1890 Faculty Research Sabbatical ProgramSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            PIERPOINT, ANTHONY - U. MARYLANDitem
                                            Hapeman, Cathleenitem
                                            TORRENTS, ALBA - U. MARYLAND
  Submitted to: Chemosphere
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 4/27/2003
                                    Publication  Date: 8/1/2003
                                    Citation: Anthony C. Pierpoint, Cathleen J. Hapeman, and Alba Torrents Ozone treatment of soil contaminated with aniline, trifluralin and other contaminants 		Submitted to Chemosphere 		Accepted by Journal: 4/27/2003 		Published: 50(8):1025-1034Interpretive Summary: Soils that are highly contaminated with organic compounds are frequently difficult to remediate.  In-situ treatment using indigenous soil microorganisms is often preferred, but frequently these compounds are resistant to biological degradation.  In these cases, pretreatment with an oxidizing agent would be desirable. Studies were conducted to determine the ability of ozone to degrade trifluralin (a common herbicide) and aniline, a pesticide precursor, in soil.  Ozone was pumped through moist soil columns and rapid degradation of aniline was observed.  Although slower, similar results were found with trifluralin.  Degradation products were identified.  Overall results suggest that ozonated water may improve contaminant removal for low solubility.  This information will be useful in designing remediation strategies for higly contaminated soils.
                                Technical Abstract: Column studies were conducted to determine the ability of ozone to degrade aniline and trifluralin in soil.  Ozone (O3) rapidly degraded aniline from soil under moist soil conditions, 5% (wt).  Removal of 77-98% of [14C]-aniline was observed from soil columns (15 mL, I.D. = 2.5 cm), exposed to 0.6% O3 (wt) at 200 mL/min after 4 min.  Initial ozonation products included nitrosobenzene and nitrobenzene, while further oxidation led to carbona dioxide (CO2).  Ring labeled [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, with the formation of 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 CO2, where 72-83% of the activity recovered comprised 14CO2.  Use of ozone-rich water improved contaminant removal in trifluralin-treated soil columns, but did not improve removal in aniline, pentachloroaniline, hexachlorobenzene treated soil columns, suggesting that ozonated water may improve contaminant removal for reactive contaminants of low solubility.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov