Eva Webster

M.Sc. (Trent)

Doctoral candidate

in the Environmental and Life Sciences Graduate Program and member of the

Centre for Environmental Modelling and Chemistry

Send email to me at: EWebster at TrentU dot ca

Ph.D. Thesis Supervisor:

  • David A. Ellis

    Supervisory Committee Members:

  • Tom Harner
  • Holger Hintelmann

    Academic Awards:

    A&WMA-OS Future Environmental Professional Scholarship – 2012
    NSERC PGS-D – 2011/05-2014/04
    Dean’s Excellence Award (Trent) – 2011
    Edwin and Irene Curtin Scholarship (ELS, Trent) – 2011
    Dean’s Ph.D. Scholarship (Trent) – 2010
    Entrance Scholarship (Trent) – 1987

    Thesis Project:

    Developing new models to describe the partitioning to biotic and abiotic organic environmental phases by organic chemicals that are not well described by the inherent assumptions of the Mackay-type, lipid-based models.

    Research Interests:

  • The development of chemical environmental fate models.
  • The application of modelling techniques to a variety of problems.

    Publications:

    By category: Peer-reviewed Articles | Book chapters and Thesis | Reports

    Peer-reviewed Articles
    34. Russell, M.H., Hoogeweg, G., Webster E.M., Ellis, D.A., Waterland, R.L. 2012. TFA from HFO-1234yf: Accumulation and aquatic risk in terminal water bodies. Environ. Toxicol. Chem. Accepted May 13, 2012.

    33. Webster, E.M., Ellis, D.A. 2012. Understanding the Atmospheric Measurement and Behavior of Perfluorooctanoic Acid. Environ. Toxicol. Chem. Accepted May 7, 2012.

    32. Webster, E.M., Ellis, D.A. 2012. Estimating chemical biotransformation rates from food web concentrations. Chemosphere. 87(4): 404-412. DOI: 10.1016/j.chemosphere.2011.12.036

    31. Webster, E.M., Ellis, D.A. 2011. Equilibrium modeling: a pathway to understanding observed perfluorocarboxylic and perfluorosulfonic acid behavior. Environ. Toxicol. Chem. 30(10):2229-2236. DOI: 10.1002/etc.637

    30. Webster, E., Ellis, D.A. 2010. The Potential Role of Sea Spray Generation in the Atmospheric Transport of Perfluorocarboxylic Acids. An Assessment of the Need for Field Measurements. Environ. Toxicol. Chem. 29(8): 1703–1708. DOI 10.1002/etc.228

    29. Webster, E., Ellis, D.A., Reid, L.K. 2010. Modeling the Environmental Fate of Perfluorooctanoic Acid and Perfluorooctanoate: An Investigation of the Role of Individual Species Partitioning. Environ. Toxicol. Chem. 29(7): 1466–1475. DOI: 10.1002/etc.181

    28. Warren, C.S., Mackay, D., Webster, E., Arnot, J.A. 2009. A Cautionary Note on Implications of the Well-Mixed Compartment Assumption as Applied to Mass Balance Models of Chemical Fate in Flowing Systems. Environ. Toxicol. Chem. 28(9): 1858-1865.

    27. Burns, D.C., Ellis, D.A., Webster, E., McMurdo, C.J. 2009. Response to Comment on “Experimental pKa Determination for Perfluorooctanoic Acid (PFOA) and the Potential Impact of pKa Concentration Dependence on Laboratory-Measured Partitioning Phenomena and Environmental Modeling” Environ. Sci. Technol. 43 (13), 5152-5154.

    26. Ellis, D.A., Webster, E. 2009. Response to Comment on “Aerosol Enrichment of the Surfactant PFO and Mediation of the Water - Air Transport of Gaseous PFOA” Environ. Sci. Technol. 43 (4), 1234-1235.

    25. Powell, A., Mackay, D., Webster, E., Arnot, J.A. 2009. Modeling bioaccumulation using characteristic times. Environ. Toxicol. Chem. 28 (2):272-278.

    24. Burns, D.C., Ellis, D.A., Li, H., McMurdo, C.J., Webster, E. 2008. Experimental pKa Determination for Perfluorooctanoic Acid (PFOA) and the Potential Impact of pKa Concentration Dependence on Laboratory-Measured Partitioning Phenomena and Environmental Modeling. Environ. Sci. Technol. 42 (24), 9283-9288.

    23. Hughes, L., Webster, E., Mackay, D. 2008. An Evaluative Screening Level Model of the Fate of Organic Chemicals in Sludge-Amended Soils Including Organic Matter Degradation. Journal of Soil and Sediment Contamination 17: 564-585.

    22. McMurdo, C.J., Ellis, D.A., Webster, E., Butler, J., Christensen, R.D., Reid, L.K.. 2008. Aerosol Enrichment of the Surfactant PFO and Mediation of the Water-Air Transport of Gaseous PFOA. Environ. Sci. Technol. 42 (11), 3969–3974.

    21. Seth, R., Webster, E., Mackay, D. 2008. Continued Development of a Mass Balance Model of Chemical Fate in a Sewage Treatment Plant. Water Research. 42: 595-604.

    20. Harvey, C., Mackay, D., Webster, E. 2007. Can the unit world model concept be applied to hazard assessment of both organic chemicals and metal ions? Environ. Toxicol. Chem. 26 (10): 2129-2142.

    19. Patwa, Z., Christensen, R., Lasenby, D.C., Webster, E., Mackay, D. An exploration of the role of mysids in benthic-pelagic coupling and biomagnification using a dynamic bioaccumulation model. Environ. Toxicol. Chem. 26 (6): 186-194.

    18. Blais, J.M., Macdonald, R.W., Mackay, D., Webster, E., Harvey, C., Smol, J.P. 2007. Biologically Mediated Transport of Contaminants to Aquatic Systems Environ. Sci. Technol. 41 (4): 1075 - 1084.

    17. Foster, K.L., Sharpe, S., Webster, E., Mackay, D., Maddalena, R. 2006. The Role of Multimedia Mass Balance Models for Assessing the Effects of Volatile Organic Compound Emissions on Urban Air Quality Atmos. Environ.40 (16): 2986-2994.

    16. Arnot, J.A., Mackay, D., Webster, E., Southwood, J. M. 2006. A screening level risk assessment model for chemical fate and effects in the environment. Environ. Sci. Technol. 40 (7): 2316 - 2323.

    15. Mackay, D., Webster, E. 2006. Environmental Persistence of Chemicals. ESPR - Environ. Sci. Pollut. Res. 13 (1):43-49.

    14. Mackay, D., Foster, K.L., Patwa, Z., Webster, E. 2006. Chemical Partitioning to Foliage: The Contribution and Legacy of Davide Calamari. ESPR - Environ. Sci. Pollut. Res. 13 (1): 2-8.

    13. Foster, K.L., Mackay, D., Parkerton, T.F., Webster, E., Milford, L. 2005. Five-Stage Environmental Exposure Assessment Strategy for Mixtures: Gasoline as a Case Study. Environ. Sci. Technol. 39(8): 2711-2718.

    12. Webster, E., Cowan-Ellsberry, C.E., McCarty, L. 2004. Putting science into PBT evaluations. Environ. Toxicol. Chem. 23: 2473-2482.

    11. Webster, E., Mackay, D., Di Guardo, A., Kane, D., Woodfine, D. 2004. Regional Differences in Chemical Fate Model Outcome. Chemosphere. 55: 1361-1376.

    10. Mackay, D., Webster, E., Woodfine, D., Cahill, T., Doyle, P., Couillard, Y., Gutzman, D. 2003. Towards Consistent Evaluation of the Persistence of Organic, Inorganic and Metallic Substances. Human and Ecological Risk Assessment (HERA). 9(6): 1445-1474.

    9. Mackay, D., Webster, E. 2003. A Perspective on Environmental Models and QSARs. SAR and QSAR in Environmental Research. 14: 7-16.

    8. Mackay, D., Hubbarde, J., Webster, E. 2003. The role of QSARs and fate models in chemical hazard and risk assessment. Proceedings of the QSAR 2002 Conference, Ottawa May 2002. Quant. Struct.-Act. Relat. - Comb. Sci. 22: 106-112.

    7. Gouin T., Mackay D., Webster E., Wania F. 2000. Screening Chemicals for Persistence in the Environment. Environ. Sci. Technol. 34: 881-884.

    6. Beyer, A., Mackay, D., Matthias, M., Wania, F., Webster, E. 2000. Assessing Long-range Transport Potential of Persistent Organic Pollutants. Environ. Sci. Technol. 34: 699-703.

    5. Webster, E., Mackay, D., Qiang, K. 1998. Equilibrium Lipid Partitioning Concentrations as a Multi-media Synoptic Indicator of Contaminant Levels and Trends in Aquatic Ecosystems. J. Great Lakes Res. 25: 318-329.

    4. Webster, E. and Mackay, D. 1998. Evaluating Environmental Persistence. Environ. Toxicol. Chem. 17: 2148-2158.

    3. Mackay, D. and Webster, E. 1998. Linking Emissions to Prevailing Concentrations - Exposure on a Local Scale. Environmetrics, 9: 541-553.

    2. Scott, S., Mackay, D., and Webster E. 1998. Estimation of Spatially Variable Atmospheric Concentrations Deduced from Regional Mass Balance Models. Chemosphere 36: 2507-2522.

    1. Mackay, D., Di Guardo A., Hickie, B., and Webster, E. 1997. Environmental Modelling: Progress and Prospects. SAR and QSAR in Environ. Res. 6: 1-17.

    Book Chapters and Thesis
    Mackay, D., Webster, E. 2007. “Simple Fugacity Models of Off-Site Exposure to Agrochemicals” Chapter 2 In Rational Environmental Management of Agrochemicals: Risk Assessment, Monitoring, and Remedial Action. I.R. Kennedy, K.R. Solomon, S.J. Gee, A.N. Crossan, S. Wang, F. Sanchez-Bayo (Eds.) ACS Symposium Series 966. pp 14-36.

    Mackay, D., Webster, E. Gouin, T. 2006. Partitioning, Persistence and Long-Range Transport. Chapter 7 In "Chemicals in the Environment: Assessing and Managing Risk" Issues 22. R.E. Hester and R.M. Harrison (Eds.) Royal Society of Chemistry, Cambridge, UK.

    Mackay, D., Webster, E., Beyer, A. 2001. “Defining the Bioaccumulation, Persistence, and Transport Attributes of Priority Chemicals” In American Chemical Society Symposium Series No. 773 Persistent, Bioaccumulative, and Toxic Chemicals, Volume II. R. Lipnick, B Jansson, D. Mackay, M. Petreas, (Eds.) ACS, Washington, pp. 14-28.

    Cousins, I., Macleod, M., Webster, E., Mackay, D. 2001. “Recent Developments in Environmental Modelling at Trent University, Canada.” In Modelling of Environmental Chemical Exposure and Risk. Linders, J.B.H.J (Ed). NATO Scientific Affairs Division, Series IV: Vol. 2.Kluwer Academic Publishers, Dordrecht, pp.105-116.

    Webster, E. 1995. “Simulation of a Photonuclear Experiment.” Masters Thesis, Applications of Modelling in the Natural and Social Sciences Graduate Program, Trent University, Peterborough.

    Reports
    15. Webster, E.M.; Ellis, D.A. Modeling the Potential Accumulation of Trifluoroacetic Acid Produced by the Degradation of 2,3,3,3-Tetrafluoropropene. Report to DuPont Haskell Global Centers for Health and Environmental Sciences. January 12, 2011. 14.

    Ellis, D.A.; Webster, E. Modelling the Environmental Fate of Ionizing Surfactants: Final report to Procter & Gamble. June 30, 2010.

    13. Ellis, D.A.; Webster, E. 2008. Modelling the Environmental Fate of Ionizing Surfactants. Report to Environment Canada, Gatineau, Quebec, Canada. March 31, 2008.

    12. Webster, E., Mackay, D. 2007. Modelling the Fate of Contaminants Introduced into Agricultural Soils from Biosolids: BASL4 Model: Users’ Manual Report to Environment Canada. CEMC Report No. 200702 Trent University, Peterborough, Ontario.

    11. Webster, E., Mackay, D. 2007. Modelling the Environmental Fate of Dioxins and Furans Released to the Atmosphere During Incineration. CEMC Report 200701. Trent University, Peterborough, Ontario.

    10. Webster, E., Hughes, L., Mackay, D. 2006. PBDE Loadings in Agricultural Soils in Ontario: Modelling Chemical Fate in Biosolids-Amended Soils. CEMC Report 200601. Trent University, Peterborough, Ontario.

    9. Webster, E., Lian, L., Mackay, D. 2005. Application of the Quantitative Water Air Sediment Interaction (QWASI) Model to the Great Lakes. Report to the Lakewide Management Plan (LaMP) Committee CEMC Report 200501. Trent University, Peterborough, Ontario.

    8. Hughes, L., Mackay, D., Webster, E., Armitage, J., Gobas, F. 2005. Development and Application of Models of Chemical Fate in Canada: Modelling the Fate of Substances in Sludge-Amended Soils. Report to Environment Canada. CEMN Report No. 200502. Trent University, Peterborough, Ontario.

    7. Webster, E., Mackay, D., Wania, F., Arnot, J., Gobas, F., Gouin, T., Hubbarde, J., Bonnell, M. 2005. Development and Application of Models of Chemical Fate in Canada: Modelling Guidance Document. Report to Environment Canada. CEMN Report No. 200501 Trent University, Peterborough, Ontario.

    6. Webster, E., Di Guardo, A., Mackay, D., Buckley, J. A., Hughes, L., Hubbarde, J. 2003. Development of Tools to Improve Exposure Estimation for Use in Ecological Risk Assessment: Multimedia Models for Sludge-Amended Soils: A Feasibility Study. Report to Environment Canada. CEMC Report 200305. Trent University, Peterborough, Ontario.

    5. Webster, E., Mackay, D., Hubbarde, J. A. 2003. Development of Tools to Improve Exposure Estimation for Use in Ecological Risk Assessment: Regional Risk Assessments Using ChemCAN. Report to Environment Canada. CEMC Report 200304. Trent University, Peterborough, Ontario.

    4. Webster, E., Hubbarde, J., Mackay, D., Swanston, L., Hodge, A. 2003. Development of Tools to Improve Exposure Estimation for Use in Ecological Risk Assessment: The TaPL3 Upgrade. Report to Environment Canada. CEMC Report 200303. Trent University, Peterborough, Ontario.

    3. Webster, E., Hubbarde, J., Mackay, D. 2003. Upgrading the ChemCAN Model: Version 4.95 to 6.00. CEMC Report 200302. Trent University, Peterborough, Ontario.

    2. Webster, E., Mackay, D. 2003. Defining Uncertainty and Variability in Environmental Fate Models. CEMC Report No. 200301. Trent University, Peterborough, Ontario.

    1. Mackay, D., Webster, E., Cousins, I., Cahill, T., Foster, K., Gouin, T. 2001. An Introduction to Multimedia Models. CEMC Report No. 200102. Trent University, Peterborough, Ontario.

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    Last updated May 14, 2012.