Ecosystems Research Division

BIOGRAPHICAL INFORMATION

Name: Nicholas T. Loux, Ph.D.

Phone: (706) 355-8121
Fax: (706) 355-8104
Email: loux.nick@epa.gov

Title: Research Chemist

Education:

A.A. 1969. Raymond Walters College, University of Cincinnati, Cincinnati, OH
B.A. 1972. Chemistry, Miami University, Oxford, OH
Ph.D. 1985. Water Chemistry, University of Wisconsin, Madison, WI

Expertise/Research Interests:

Nanomaterials in the environment.

Interfacial chemistry (thermodynamics of air/water and solid/water interfaces).

Applied geochemical speciation modeling (MINTEQA2, MINEQL; elements including Pb, Cd, Hg, Be, Cr, As, Se, Cu, Ni, and Zn).

Electrical double layer/adsorption modeling.

Environmental speciation behavior of mercury, lead and cadmium.

Metals bioavailability in soils, sediments and aquifer materials.

Electrostatic effects on contaminant fate and transport in porous media.

Professional Organizations:

American Chemical Society
Sigma Xi
American Association for the Advancement of Science
International Association of Geochemistry

Selected Publications:

Loux, N.T. 2008. Extending the diffuse layer model of surface acidity constant behavior: II. Estimation of intrinsic acidity and electrolyte ion site binding constants. Chemical Speciation and Bioavailability, 20(3):161-172.

Loux, N.T. and Savage, N. 2008. An assessment of the fate of metal oxide nanomaterials in porous media. Water, Air and Soil Pollution, 145:155-168.

Loux, N.T. 2008. Simulating the vapour phase air/water exchange of p,p'-DDE, p,p'-DDT, lindane and 2,3,7,8-tetrachlorodibenzodioxin. Chemical Speciation and Bioavailability, 20(2):77-91.

Utterback, D., Loux, N.T., Hatto, P., Veronesi, B., Su, Y., Tolaymat, T., Diamond, S. Winchester, E. and Savage, N. 2008. Final Report: Applicability of OPPTS 830 Series and OECD 100 Series Harmonized Test Guidelines to Manufactured Nanomaterials: Recommendations from the ORD Physical Chemical Properties Workgroup. Internal report submitted to the U.S. EPA OPPTS, Oct. 29, 2008.

Loux, N.T. 2007. An assessment of thermodynamic reaction constants for simulating aqueous environmental monomethylmercury speciation. Chemical Speciation and Bioavailability", 19(4):183-196.

Loux, N.T. 2006. Extending the Diffuse Layer Model of Surface Acidity Behavior: I. Model Development. Chemical Speciation and Bioavailability", 18(3):105-116.

Loux, N.T., Hassan, S.M. and Chafin, C.R. 2005. Empirical Partitioning Models for Lead and Cadmium Using Data from 13 Soils, Sediments and Aquifer Materials, U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, Ecosystems Research Division, 960 College Station Road, Athens, Georgia . 30605-2700. EPA/600/R-05/077.

Loux, N.T. 2005. Modeling Monomethymercury and Tributyltin Speciation with EPA's Geochemical Speciation Model MINTEQA2, U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, Ecosystems Research Division, 960 College Station Road, Athens, Georgia 30605-2700. EPA/600/R-05/063.

Loux, N.T. 2004. A critical assessment of elemental mercury air/water exchange parameters, Journal of Chemical Speciation and Bioavailability, 16(4):127-138.

Loux, N.T. 2004. Modeling Monomethylmercury [CH₃Hg⁺] and Tributyltin [(C₄H₉)₃Sn⁺] Speciation with EPA's Geochemical Speciation Model MINTEQA2. Input files for distribution with MINTEQA2. U.S. EPA/ORD/NERL/ERD, 960 College Station Road, Athens, GA 30605-2700. November 2, 2004.

Loux, N.T. and Frick, W.E. 2003. Should Global Tropospheric Vapor Concentrations be Recorded on a Mass Density Basis?. In Hatcher, K.J. (Editor), Proceedings of the 2003 Georgia Water Resources Conference, April 23-24, 2003, University of Georgia, Athens, Georgia, USA.

Loux, N.T. 2003. Effective acidity constant behavior near zero charge conditions. Chapter 11 In Keane, M.A. (Ed.), Interfacial Applications in Environmental Engineering, Marcel Dekker, Inc., New York, New York, USA .

Loux, N.T. 2002. An Exact Method for Relating Zwitterionic Microscopic to Macroscopic Acidity Constants. Journal of Chemical Speciation and Bioavailability, 15:47-51.

Loux, N.T. and Washington, J.W. 2002. Feasibility study for adding a high ionic strength activity coefficient algorithm to MINTEQA2. U.S. EPA/ORD/NERL/ERD, Athens, Georgia , USA .

Barber, M.C., Baca, R.M., Bird, S.L., Doherty, J., Exum, L.R., Johnston, J.M., Lassiter, R.R., Rashleigh, B., Cyterski, M.J., Colarullo, S., Loux, N.T., Prieto, L.M., and Wright, C.J. 2002. Regional Assessment of Fish Health: A Prototype Methodology and Case Study for the Albermarle-Pamlico River Basin, North Carolina. U.S. Environmental Protection Agency, 960 College Station Road, Athens, GA 30605-2700. EPA/600/R-02/067. October, 2002.

Loux, N.T. 2001. Monitoring cyclical air/water elemental mercury exchange. Journal of Environmental Monitoring. 3:43-48.

Loux, N.T. 2001. The role of aqueous thin film evaporative cooling on rates of elemental mercury air-water exchange under temperature disequilibrium conditions. In Hatcher, K.J. (Editor), Proceedings of the 2001 Georgia Water Resources Conference, March 26-27, 2001. University of Georgia, Athens, Georgia , USA . Pp. 791-793.

Loux, N.T. 2001. The effect of salinity on rates of elemental mercury air/water exchange. In Marcy, S.K.M. (Chair), Proceedings of the U.S. EPA International Workshop on Heavy Metals in the Arctic, McLean, Virginia, USA . June 18-22, 2001. Pp. B-15 through B-18.

Loux, N.T. and Anderson, M.A. 2001. Mobile ion activities at charged interfaces. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 177:123-131.

Loux, N.T. 2000. Diel temperature effects on the exchange of elemental mercury between the atmosphere and underlying waters. Environmental Toxicology and Chemistry. 19:1191-1198.

Loux, N.T. 1998. An assessment of mercury-species-dependent binding with natural organic carbon. Chemical Speciation and Bioavailability. 10:127-136.

Loux, N.T. An Assessment of Mercury Binding with Naturally-Occurring Organic Matter. EPA Internal Report, U.S. Environmental Protection Agency, Env. Research Laboratory, Athens, GA. September 1994.

Loux, N.T. Abiotic Biogeochemical/Transport Properties for Assessing Ecological Mercury Exposures in South Florida. Section in ERL-Athens Ecological Risk Team research plan for South Florida, June, 1994.

Loux, N.T. Geochemical Investigations on the Behavior of Silver in Sedimentary Porewaters. First International Conference on Silver in the Environment, University of Wisconsin-Madison, August 8-10, 1993.

Loux, N.T. and Brown, D.S. 1993. In Russo, R.C. and Thurston, R.V. Eds. Prediction of Metal Contaminant Exposure in Natural Waters Using Geochemical Speciation Modeling. International Symposium on Fish Physiology, Toxicology and Water Quality Management. Sacramento, California. Held September 18-20, 1990. pp. 149-164. EPA/600/R-93/157. August, 1993.

Loux, N.T., Allison, J.D., Chafin, C.R. and Hassan, S.M. 1991. Carbonate Equilibria and Groundwater Sample Collection: Implications for Estimated Average Subsurface Properties in Continental North America. International Journal of Environmental Analytical Chemistry, 44:41-53.

Hassan, S.M. and Loux, N.T. 1990. Elimination of Spectral Interferences in Inductively Coupled Plasma Atomic Emission Spectroscopy Using Orthogonal Polynomials. Spectrochimica Acta, 45B:719-729.

Loux, N.T., Brown, D.S., Chafin, C.R, Allison, J.D. and Hassan, S.M. 1990. Modeling Geochemical Processes Attenuating Inorganic Contaminant Transport in the Subsurface Region: Adsorption on Amorphous Iron Oxide. IN Proceedings: Environmental Research Conference on Groundwater Quality and Waste Disposal, Murarka, I.P. and Cordle, S. Eds. EPRI/EPA, Document Number EN-6749. 18 pp.

Loux, N.T., Jafvert, C.J., Allison, J.D., Hassan, S.M. and Chafin, C.R. A Geochemical Assessment of Potential Porewater Exposure to EPA-Regulated Metal and Ionizable Organic Contaminants for Use in Developing Equilibrium-Partitioning Sediment Quality Criteria. Deliverable submitted to the EPA Office of Water, July, 1990.

Loux, N.T., Chafin, C.R., and Hassan, S.M. Statistics of Aquifer Material Properties and Empirical, pH-Dependent Partitioning Relationships for As(III), As(V), Ba(II), Be(II), Cd(II), Cr(VI), Cu(II), Hg(II), Ni(II), Pb(II), Sb(V), Se(IV), Se(VI), Tl(I), and Zn(II). Internal report submitted to the EPA Office of Solid Waste, February, 1990.

Loux, N.T., Brown, D.S., Chafin, C.R, Allison, J.D. and Hassan, S.M. 1989. Chemical Speciation and Competitive Cationic Partitioning on a Sandy Aquifer Material. Chemical Speciation and Bioavailability, 1:111-126.

Loux, N.T., Garrison, A.W., and Chafin, C.R. 1989. Acquisition and Analysis of Groundwater/Aquifer Samples: Current Technology and the Trade-Off Between Quality Assurance and Practical Considerations. International Journal of Environmental Analytical Chemistry, 38:231-253.

Loux, N.T., Chafin, C.R. and Hassan, S.M. Geochemical Speciation Model (MINTEQA2) Predictions of Metal/Metalloid Partitioning in Aerobic Aquifer Systems. Deliverable submitted to the EPA Office of Solid Waste, August, 1989.

Azarraga, L.V., Bailey, G.W., Loux, N.T., and Garrison, A.W. The Speciation and Fate of Toxic Metals in Aquatic Environments. Research Brief, U.S. EPA Office of Research and Development, Athens, Georgia . 1988. EPA/600/X-88/309.

Chafin, C.R. and Loux, N.T. Sample Acquisition Program for Bench Scale Testing of MINTEQA1: Sample Manager's Report. Internal report prepared for the Office of Solid Waste and Emergency Response. July, 1988.

Loux, N.T. and Chafin, C.R. Interim Report on the Distribution of Trace Contaminants between the Soluble and Solid Phases for MINTEQA1 Bench Scale Testing. Internal report prepared for the Office of Solid Waste and Emergen-cy Response. January, 1988.

Chafin, C.R. and Loux, N.T. Collection and Characterization of Samples for Bench Scale Testing of MINTEQA1: Sample Manager's Report. Internal report prepared for the Office of Solid Waste and Emergency Response. January, 1988.

Loux, N.T. and Azarraga, L.V. Application of Adsorption Models in MINTEQA1 to Determine Partitioning of Metals on Aquifer Material: Current Implementation Strategy. Internal report prepared for the Office of Solid Waste and Emergency Response. September, 1987.

Loux, N.T. and Azarraga, L.V. Application of MINTEQ Adsorption Models to Natural Aquifer Systems. Internal report prepared for the Office of Solid Waste and Emergency Response. February, 1987.

Loux, N.T. 1985. Energetics Associated with the Diffuse Layer Structure Surrounding Hydrous Oxide Substrates, PhD. Thesis, Department of Water Chemistry, University of Wisconsin, Madison, Wisconsin..

Andren, A., Anderson, M., Loux, N. And Talbot, R. 1980. Element Flow in Aquatic Systems Surrounding Coal Fired Power Plants. Wisconsin Power Plant Impact Study, EPA 600/3-80-076. pp. 1-84.

Selected Technical Presentations:

Loux, N.T., Veronesi, B., Su, Y., and Diamond, S. 2008. Tools for assessing ecological nanomaterial exposures. Poster presented at the conference on Aquatic Conservation Science: Merging Theory and Application, Odum School of Ecology, University of Georgia, Athens, Georgia. Oct. 3-4, 2008.

Utterback, D., Loux, N.T., Hatto, P., Veronesi, B., Su, Y., Tolaymat, T., Diamond, S. Winchester, E. and Savage, N. Physical Chemical Properties Workgroup Recommendations: Applicability of OPPTS Series 830 Guidelines to Nanomaterials, Ronald Reagan Building, Room 51161, Policyeum Room, 1300 Pennsylvania Avenue,Washington, DC. July 17, 2008.

Loux, N.T. and Savage, N. An assessment of the fate of metal oxide nanomaterials in porous media. Paper number 27, Division of Environmental Chemistry, 235th American Chemical Society National Meeting and Exposition, New Orleans, LA. April 6-10, 2008.

Loux, N.T. Mercury in the Environment. Technical presentation at the 2007 Georgia Science Teachers Association Conference, Athens, Georgia , February 17, 2007.

Loux, N.T. Issues in Simulating Elemental Hg Air/Water Exchange and Aqueous Monomethylmercury Speciation. Invited technical presentation at U.S. EPA Metals Fate and Transport Modeling Workshop, Denver, Colorado. February 13-15, 2007.

Loux , N.T. Simulating the Air/Water Exchange of Elemental Mercury, 2,3,7,8-TCDD, lindane, 4,4'-DDE and 4,4'DDT. Technical presentation at U.S. EPA/ORD/NERL/ERD, 960 College Station Road, Athens, GA. Sept. 28, 2006.

Loux, N.T. Thermodynamic Reaction Constants for Modeling Aqueous Environmental Mercury Speciation. Poster number W-24 presented in Session S-EB-2: Mercury Dissolved Organic Matter Interactions (1), Eighth International Conference on Mercury as a Global Pollutant, University of Wisconsin, Madison, Wisconsin. August 6-11, 2006.

Loux, N.T. Aqueous Protonation Properties of Amphoteric Nanoparticles. Poster number 145 presented in the General Papers Session of the Division of Environmental Chemistry, 231st American Chemical Society National Meeting. March 28-30, 2006, Atlanta, Georgia .

Loux, N.T. Conundrums in Environmental Chemistry, U.S. EPA/ORD/NERL/ERD, 960 College Station Road, Environmental Information Annex, Sept. 1, 2005.

Loux, N.T., Hassan, S.M. and Chafin, C.R. Empirical Partitioning Models for Pb and Cd Using Data from 13 Soils, Sediments and Aquifer Materials. Poster number 67 presented in the General Papers Session of the Division of Environmental Chemistry, 229th American Chemical Society National Meeting. March 13-17, 2005, San Diego, California.

Loux, N.T. Issues in Modeling Elemental Mercury Air/Water Exchange. Poster number 72 presented in the General Papers Session of the Division of Environmental Chemistry, 227th American Chemical Society National Meeting. March 28, 2004 - April 1, 2004, Anaheim, California.

Loux, N.T. An Exact Method for Relating Zwitterionic Microscopic to Macroscopic Acidity Constants. Poster number 73 presented in the General Papers Session of the Division of Environmental Chemistry, 227th American Chemical Society National Meeting. March 28, 2004 - April 1, 2004, Anaheim, California.

Loux, N.T. DIFMOD2PB: A Next Generation Diffuse Layer Model. Poster AE.2.P041 presented at the Analytical/Environmental session of the 39th IUPAC Conference and the 86th Conference of the Canadian Society for Chemistry, Ottawa, Ontario, Canada . August 10-15, 2003.

Loux, N.T. and Frick, W.E.. Should Global Tropospheric Vapor Concentrations be Reported on a Mass Density Basis? Poster presented at the 2003 Georgia Water Resources Conference, Center for Continuing Education, University of Georgia, Athens, Georgia . April 23-24, 2003.

Loux, N.T. Conundrums in Environmental Chemistry. Presented at Florida Center for Solid and Hazardous Waste Management, University of Florida, Gainesville. December 19, 2002.

Loux, N.T., Collette, T.W. and Washington, J.W. An alternative method for relating macroscopic to microscopic acidity constants with zwitterionic species. Aqueous Chemistry Section, Poster number 116, Division of Environmental Chemistry, 223rd American Chemical Society National Meeting, Orlando, Florida. April 7-11, 2002.

Loux, N.T. and Washington, J.W. Errors in applying low ionic strength activity coefficient algorithms to higher ionic strength media. Aqueous Chemistry Section, Poster number 117, Division of Environmental Chemistry, 223rd American Chemical Society National Meeting, Orlando, Florida. April 7-11, 2002.

Loux, N.T. Effective Acidity Constant Behavior Near Zero Charge Conditions, Paper 290, Division of Colloid and Surface Chemistry, 222nd American Chemical Society National Meeting, Chicago, Illinois. August 26-30, 2001.

Loux, N.T. The effect of salinity on rates of elemental mercury air/water exchange. Poster presented at the EPA Workshop on Heavy Metals in the Environment, McLean, Virginia, USA . June 18-22, 2001.

Loux, N.T. The role of aqueous thin film evaporative cooling on rates of elemental mercury air-water exchange under temperature disequilibrium conditions. Poster presented at the 2001 Georgia Water Resources Conference, University of Georgia, Athens, Georgia . March 26-27, 2001.

Loux, N.T. The role of temperature disequilibrium in monitoring low volatility contaminant migration. Invited speaker, Paper number O-25, Fourth International Symposium on Speciation of Elements in Biological, Environmental, and Toxicological Sciences, Whistler Conference Center,Whistler, British Columbia, Canada . June 25 - July 1, 2000.

Loux, N.T. Developments in, and mining site applications of, MINTEQ (metals fate transport model). In Modeling and Predictive Tools; Fate, Transport Issues session of the EPA Mining Waste Scientist-to-Scientist Meeting, Las Vegas, Nevada. June 14-15, 2000. Participated via PlaceWare.

Loux, N.T. Variable bound-site charging contributions to surface complexation mass action expressions. Computational Methods in Environmental Chemistry Section, Paper 114, Environmental, Computational and Geochemistry Divisions, 219th American Chemical Society National Meeting, San Francisco, California. March 26-30, 2000.

Loux, N.T. Issues in assessing low level ionizable contaminant partitioning in soils and sediments.. Paper W10.01. Society for Risk Analysis National Meeting, Atlanta, Georgia , December 5-8, 1999.

Loux, N.T. Charging contributions to bound-site activity coefficients with the entropic balanced surface potential model. Poster No. 197. Environmental and Geochemistry Divisions, American Chemical Society National Meeting, Anaheim, California. March 20-25, 1999.

Loux, N.T. Diel and seasonal exchange of elemental mercury between the atmosphere and underlying waters.. Poster # P02. At SETAC/EPA/ASTM symposium Modeling and Measuring the Vulnerability of Ecosystems at Regional Scales for Use in Ecological Risk Assessment and Risk Management. Seattle, Washington. August 17-20, 1998.

Loux, N.T. Aqueous Mobile Ion Activities at Charged Interfaces. Paper # 36. American Chemical Society 72nd Colloid and Surface Science Symposium, Pennsylvania State University, University Park, Pennsylvania. June 21-24, 1998.

Loux, N.T. Estimation of Electrical Double Layer (EDL) Dimensionality Using the Entropic Balanced Surface Potential Model. Paper # 109. American Chemical Society 71st Colloid and Surface Science Symposium, University of Delaware, Newark, Delaware. June 29 - July 2, 1997.

Loux, N.T. A Chemical Potential Model for Assessing the Impact of Temperature Disequilibrium on Elemental Mercury Evasion Rates from Natural Waters. Paper # 228. 213th American Chemical Society National Meeting, San Francisco, California. April 13-17, 1997.

Loux, N.T. An Assessment of Mercury Species-Dependent Binding with Natural Organic Carbon. Paper # 20. American Chemical Society 70th Colloid and Surface Science Symposium, Clarkson University, Potsdam, New York. June 16-19, 1996.

Loux, N.T. The Finite Ion Size Effect in the Entropic Balanced Surface Potential Model.. Paper # 63. American Chemical Society 70th Colloid and Surface Science Symposium, Clarkson University, Potsdam, New York. June 16-19, 1996.

Loux, N.T. Metal Speciation in Environmental Assessments, U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, Research Triangle Park, North Carolina. May 26, 1995.

Loux, N.T. and C.R. Chafin. pH-Dependent Partitioning of Lead and Cadmium on Subsurface Materials: Mechanistic Inferences from Experimental Data. Paper number 126, General Papers session. 69th Colloid and Surface Science Symposium, American Chemical Society, University of Utah, Salt Lake City, Utah. June 11-14, 1995.

Loux, N.T. Geochemical Investigations on the Behavior of Silver in Sedimentary Porewaters, First International Conference on the Transport, Fate and Effects of Silver in the Environment, University of Wisconsin-Madison. August 8-10, 1993.

Loux, N.T. Fate and Transport of Metals in Sediments. Third Biennial International Symposium on Fish Physiology, Toxicology and Water Quality Management. Nanjing University, Nanjing, Jiangsu Province, Peoples Republic of China , Nov. 3-5, 1992.

Loux, N.T. Bioavailability of Metals from Contaminated Soils and Sediments. State Key Laboratory of Environmental Aquatic Chemistry, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, P.R. China, June 24, 1992.

Loux, N.T. Geochemical Applications to Assist in Estimating Biological Exposures to Metals, Introduction to WASP4 Training Course, Center for Continuing Education, University of Georgia, April 2, 1992.

Loux, N.T. Modeling Cationic Adsorption on Amorphous Iron Oxide: Field Data Collection Through Modeling Results. Workshop on The Metals Equilibrium Speciation Model-MINTEQA2. ERL-Athens, August 22, 1991.

Loux, N.T. Geochemistry in EPA: Where We Are, Where We are Going. U.S. EPA Environmental and Emergency Response Team, Edison, New Jersey. July 30, 1991.

Chafin, C.R., Loux, N.T., Hassan, S.M. Studies on the Determination of Adsorptive Iron and Manganese in Soils and Sediments. Poster Session, Workshop on Metal Speciation and Contamination of Soil, Jekyll Island, Georgia , May 22-24, 1991.

Hassan, S.M., Loux, N.T., and Chafin, C.R. Ion Chromatographic Determination of Certain Inorganic Sulfur Species of Environmental Interest. Poster Session, Workshop on Metal Speciation and Contamination of Soil, Jekyll Island, Georgia , May 22-24, 1991.

Brown, D.S., Allison, J.D., Loux, N.T. and Allison, T.L.. Environmental Applications of the Geochemical Speciation Model MINTEQA2/PRODEFA2. 82th Annual Meeting of the American Society of Agronomy, Agronomic Divisions, San Antonio, Texas, October 21-26, 1990.

Brown, D.S., Loux, N.T. and Laniak, G.R.. Modeling Lead Exposure and Bioavailability. Symposium on the Bioavailability and Dietary Exposure of Lead. University of North Carolina, Chapel Hill. September 24-27, 1990.

Loux, N.T. and Brown, D.S. Prediction of Metal Contaminant Exposure in Natural Waters Using Geochemical Speciation Modeling. International Symposium on Fish Physiology, Toxicology and Water Quality Management. Sacramento, California. September 18-20, 1990.

Loux, N.T. Modeling Cationic Adsorption on Amorphous Iron Oxide: Field Data Collection Through Modeling Results. Workshop on The Metals Equilibrium Speciation Model-MINTEQA2. ERL-Athens, August 21-23, 1990.

Loux, N.T. and Jafvert, C.J. A Geochemical Assessment of Porewater Exposure to Metal and Ionizable Organic Contaminants for Use in Developing Equilibrium-Partitioning Sediment Quality Criteria. Seminar sponsored by the USEPA Office of Research and Development, WIC, Washington, DC. August 20, 1990.

Loux, N.T., Chafin, C.R., and Hassan, S.M. pH-Dependent Cationic Partitioning on Aquifer Materials and Surface Water Sediments. Session on Environmental Chemistry of Metals, International Conference on Metals in Soils, Waters, Plants and Animals. Orlando, Florida. April 30 - May 3, 1990.

Hassan, S.M., Loux, N.T. and Chafin, C.R. pH-Dependent Partitioning of As(III), As(V), Cr(VI), Sb(V), Se(IV) and Se(VI) on Aquifer Materials and Sediments. Poster Session, Int. Conf. on Metals in Soils, Waters, Plants and Animals. Orlando, Florida. April 30-May 3, 1990.

Brown, D.S., Loux, N.T., Washington, E., Topping, D. and Allison, J.D. 1989. An Exposure Assessment Modeling Scenario for Metal Speciation and Transport From Land Disposal Sites. The Scientific Challenges of NEPA: Future Directions Based on 20 Years Experience. 9th Oak Ridge Nat. Lab. Life Sciences Symp. Oak Ridge, Tennessee. Oct. 24-27, 1989.

Chafin, C.R., Loux, N.T. and Hassan, S.M. Laboratory Testing of Geochemical Speciation Predictions of Subsurface Cationic Partitioning. Poster Session, Metal Speciation and Transport in Groundwaters, Jekyll Island, Georgia . May 24-26, 1989.

Hassan, S.M., Loux, N.T. and Chafin, C.R. Partitioning of Inorganic Anionic Contaminants with Aquifer Materials. Poster Session, Metal Speciation and Transport in Groundwaters, Jekyll Island, Georgia . May 24-26, 1989.

Loux, N.T., Brown, D.S., Chafin, C.R., Allison, J.S. and Hassan, S.M. Modeling Metal Cation Sorption on a Sandy Aquifer Material. Environmental Research Conference: Groundwater Quality and Waste Disposal. Sponsored by the Electric Power Research Institute and the United States Environmental Protection Agency. DuPont Plaza Hotel, Washington, D.C. May 2-4, 1989.

Loux, N.T., Brown, D.S., Chafin, C.R., and Allison, J.S. 1988. Bench Scale Testing of MINTEQA1 Predictions of Metals Adsorption on Aquifer Materials. Paper # 37. Presented at the Ninth Annual Meeting of the Society of Environmental Toxicology and Chemistry. Arlington, Virginia. Nov. 13-17, 1988.

Garrison, A.W., Loux, N.T. and Chafin, C.R. 1988. Acquisition and Analysis of Groundwater/Aquifer Samples: Current Technology and the Trade_Off Between Quality Assurance and Practical Considerations. 4th International Congress on Analytical Techniques in Environmental Chemistry, Barcelona, Spain , Sept. 5-8, 1988.

Loux, N.T., Azarraga, L.V. and Chafin, C.R. Electrostatic Phenomena Associated with Natural Aquatic Surfaces. Poster session, 17th Annual Symp. on the Analytical Chemistry of Pollutants (including Environmental Process Chemistry). Jekyll Island, May 17-22, 1987.

Wolfe, N.L. and Loux, N.T. Observations in Measuring Eh in Sediment Systems. Subsurface Redox Workshop, Kerr Environmental Research Laboratory, Ada, OK. March 4-5, 1987.

Current Projects:

Improving and extending the elemental mercury air/water exchange model to all aquatic systems.

Improving surface complexation model mass action expression formulations.

Assessing the suitability of MINTEQA2 activity coefficient algorithms for use in high ionic strength systems.

Developing continuous empirical models of ionic contaminant partitioning behavior with natural soils, sediments and aquifer materials.

Formulating quantitative relationships describing the significance of electrostatic phenomena on ionic contaminant fate and transport in porous media.