![[logo] US EPA](https://webarchive.library.unt.edu/eot2008/20090515092520im_/http://www.epa.gov/epafiles/images/logo_epaseal.gif){kind=logo}
Stephen Duirk
Biographical Information
Stephen Duirk
960 College Station Road
Athens, GA 30605
(706) 355-8206
duirk.stephen@epa.gov
Title: Environmental Engineer
Education:
|
Ph.D. |
2003 |
Environmental Engineering |
University of Iowa, Iowa City , IA |
|
M.S. |
1999 |
Civil and Environmental Engineering |
University of Akron, Akron, OH |
|
B.S. |
1996 |
Civil Engineering |
Ohio University, Athens, OH |
Research Interests:
Steve's research is to assess the potential exposure of community water systems to pesticides, toxic compounds, and their transformation products after the contaminated raw water has undergone water treatment (e.g. chlorine disinfection and water softening). Specific goals of Steve's research are to: 1) provide chemical-specific information on the effects of water treatment for high-priority pollutants, 2) provide physicochemical parameters for transformation products, and 3) develop predictive models capable of forecasting treatment effects that cross chemical class and treatment conditions.
Publications:
Duirk, S.E. and Valentine, R.L. (2007) Bromide Oxidation and Formation of Dihaloacetic Acids in Chloraminated Water. Environmental Science and Technology 41(20): 7047-7053.
Henderson, W.M., Weber, E.J., Duirk, S.E., Washington, J.W., and Smith, M.A. (2007) Quantification of Fluorotelomer-Based Chemicals in Mammalian Matrices by Monitoring Perfluoroalkyl Chain Fragments with GC/MS. Journal of Chromatography B 846(1-2): 155-161.
Duirk, S.E. and Valentine, R.L. (2006) Modeling Dichloroacetic Acid Formation from the Reaction of Monochloramine with Natural Organic Matter. Water Research 40(14): 2667-2674.
Cherney, D.P., Duirk, S.E., Tarr, J.C., and Collette, T.W. (2006) Monitoring the Speciation of Aqueous Free Chlorine from pH 1 to 12 with Raman Spectroscopy to Determine the Identity of the Potent Low-pH Oxidant. Applied Spectroscopy 60(7): 764-772.
Duirk, S.E. and Collette, T.W. (2006) Degradation of Chlorpyrifos in Aqueous Chlorine Solutions: Pathways, Kinetics, and Modeling. Environmental Science and Technology 40(2): 546-551.
Duirk, S.E., Gombert, B., Croue, J.P., and Valentine, R. L. (2005) Modeling Monochloramine Loss in the Presence of Natural Organic Matter. Water Research, 39 (14): 3418-3431.
Choi , J., Duirk, S.E., and Valentine, R.L. (2002) Mechanistic studies of N-nitrosodimethylamine (NDMA) formation in chlorinated drinking water. Journal of Environmental Monitoring, 4 (2): 249-252.
Duirk, S.E., Gombert, B., Choi, J., and Valentine, R.L. (2002) Monochloramine loss in the presence of humic acid. Journal of Environmental Monitoring, 4 (1): 85-89.
Miller, C.M., Duirk, S.E., and Gardner, K.H. (2000) Chromium Leaching from Silicon Foam-Encapsulated Mixed Waste . Environmental Science and Technology, 34 (3 ): 455-460.
Duirk, S.E., Butala, W., and Miller, C.M. Chapter 17 Encapsulation of Nitrate Salt Waste Using Polysiloxane, Emerging Technologies in Hazardous Waste Management 8, Kluwer Academic/Plenum Publishers, pp. 199-206, 2000.
Bower, K., Duirk, S.E., and Miller, C.M. Chapter 14 Development of and Enhanced Ozone-Hydrogen Peroxide Advanced Oxidation Process, Emerging Technologies in Hazardous Waste Management 8, Kluwer Academic/Plenum Publishers, pp. 167-176, 2000.
Published Reports
Duirk, S.E., D.P. Cherney, C.J. Tarr, and T.W. Collette. (2006) Determining Active Oxidant Species Reacting with Organophosphate Pesticides in Chlorinated Drinking Water . U.S. Environmental Protection Agency, Athens, GA. Publication No. EPA/600/R-06/103 . (PDF, 83 pp., 804 KB).
Duirk, S.E. and Collette, T.W. (2005) Organophosphate Pesticide Degradation Under Drinking Water Treatment Conditions . U.S. Environmental Protection Agency Athens, GA. Publication No. EPA/600/R-05/103 (PDF, 64 pp., 470 KB)
Valentine R.L. and Duirk, S.E. (2003) Mechanisms and Kinetics of Chloramine Loss and By-Product Formation in the Presence of Reactive Drinking Water Distribution System Constituents. Department of Civil and Environmental Engineering, University of Iowa. Publication No. EPA STAR Report 826-832-01-0
Presentations
Duirk, S.E. and DeSetto, L.M. Organophosphorus Pesticide Degradation Pathways During Drinking Water Treatment. Micropol and Ecohazard, Frankfurt/Main, Germany, June 17-20, 2007Duirk, S.E., Tarr, J.C., and Collette, T.W. Organophosphate Pesticide Degradation in the Presence of Naturally Occurring Aquatic Constituents Under Drinking Water Treatment Conditions. Annual Conference, American Water Works Association, San Antonio, TX, United States, June 11-15, 2006.
Duirk, S.E., Tarr, J.C., and Collette, T.W. Aqueous Chlorination of Chlorpyrifos in the Presence of Bromide and Natural Organic Matter. 231st ACS National Meeting, Atlanta, GA, United States, March 26-30, 2006.
Duirk, S.E. Degradation Pathways of Chlorpyrifos Under Drinking Water Treatment Conditions . U.S. EPA ORD/ERD Seminar Series, Athens, GA, United States, January 19, 2006.
Duirk, S. E. and Collette, T. W. Organophosphate Degradation Under Drinking Water Treatment Conditions: Modeling Perspectives . Annual Conference, American Water Works Association, San Francisco, CA, United States, June 13-16, 2005.
Duirk, S. E. Research, Data, and Modeling Needs . Drinking Water Treatment Scientist-to-Scientist Meeting, US EPA, Washington D.C., United States, January 28-29, 2004.
Henderson, W.M., Duirk, S.E., Weber, E.J. and Smith, M.A. Mammalian Metabolism and Distribution of Perfluorooctyl Ethanol (8-2 Telomer Alcohol) and Its Oxidation Metabolites
- 44th Annual Meeting of the Society of Toxicology, New Orleans, LA. March 2005
- Southeastern American Association for Laboratory Animal Science, Athens, GA, April 2005
- Interdisciplinary Toxicology Program Conference, Athens, GA, March 2005
- Southeast Chapter of the Society for Toxicology Annual Symposium, Atlanta, GA, October 2004
Duirk, S.E., Whitney, J.C., and Valentine, R.L. Preliminary Investigations into Chloramine Loss and DBP Formation in the Presence of NOM and Bromide. Annual Conference, American Water Works Association, New Orleans, LA, United States, June 16-20, 2002.
Duirk, S.E. and Valentine, R.L. Modeling monochloramine loss in the presence of natural organic matter and formation of haloacetic acids. 24th Annual Midwest Environmental Chemistry Workshop. Minneapolis, MN, United States, October 6-7, 2001.
Duirk, S.E., Gombert, B., Croue, J.P., and Valentine, R.L. Modeling monochloramine loss in the presence of natural organic matter and relationship to haloacetic acid formation. 222nd ACS National Meeting, Chicago, IL, United States, August 26-30, 2001.
Duirk, S.E., Gombert, B., and Valentine, R.L. Modeling the reactions of monochloramine and free chlorine with NOM. Annual Conference, American Water Works Association, Washington D.C., United States, June 17-21, 2001.
Duirk, S.E., Bower, K., and Miller, C.M. Development of an enhanced ozone-hydrogen peroxide advanced oxidation process. 216th ACS National Meeting, Boston, MA . United States, August 23-27, 1998.
Duirk, S.E., Butala, W., and Miller, C.M. Encapsulation of nitrate salt waste using polysiloxane. 216th ACS National Meeting, Boston, MA, United States, August 23-27, 1998.