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Georges-Marie Momplaisir, Ph.D.
Research Chemist

Professional Experience

April 1999 - present. Research Chemist, U.S. EPA, National Exposure Research Laboratory (NERL)

  On-going Research Studies
  Development of Analytical Methods for Studying the Environmental Fate of Organoarsenical Animal Feed Additives: A collaborative research project between the Environmental Chemistry Branch (ECB) and the U.S. Geological Survey Water(USGS). Once finalized, these methods will be available to the EPA Regions to inform environmental assessment decisions regarding arsenic contamination. This study will provide key information needed to assess whether concentrated animal feedlot operations (CAFOs) using organoarsenic feeds should be regulated as point pollution sources. It will give to the Regions the tools needed to monitor such operations.
  Determination of ultra-trace levels of agricultural pesticides in alpine lake waters.Analytical methods have been developed to extract, concentrate, and purify ultra-trace levels of agricultural pesticides in large volumes of water.
December 1998 - April 1999. Research Chemist /Laboratory Coordinator, University of Nevada Las Vegas, Harry Reid Center for Environmental Studies, Las Vegas.
    Research involved the development of analytical methods based on Hydride Generation coupled with Atomic Absorption Spectrometry for the identification and quantification of naturally occurring compounds of arsenic, selenium, and antimony in ground waters collected in Southern Nevada. Such information was necessary to determine the redox properties of the ground waters. The total concentrations of the elements in the water samples were confirmed by ICPMS.


McGill University, Department of Food Science and Agricultural Chemistry. Ph.D. 1996, Analytical/Organometallic Chemistry. Dissertation: “Development of Analytical Methods for the Speciation of Arsenic in the Marine Environment.”

Montreal University, Department of Chemistry. B.Sc. 1987, Chemistry.


U.S. National Research Council Resident Research Associateship award for research to be conducted at the U.S. Environmental Protection Agency, National Exposure Research Laboratory, Las Vegas NV (1995-1998).

Walter M. Stewart McGill postgraduate scholarship (1990-1991).

Selected Presentations and Publications

Bradford, D. F., E. M. Heithmar, N. G. Tallent-HalsellL, G. Momplaisir, C. G. Rosal, K. E. Varner, M. S. Nash, and L. A. Riddick. Temporal Patterns and Sources of Atmospherically Deposited Pesticides in Alpine Lakes of the Sierra Nevada, California , USA. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 44(10):4609-4614, (2010). Published 05/24/2010.

Momplaisir, G.M., Varner, A.K. Heithmar, E.M, Rosal, C.G., Riddick, L.A., Ferguson, P., Gentry, B., Bradford, D.F. and Tallent-Halsell, N., “Determination of Ultratrace Concentrations of Agricultural Pesticides in Water using Solid-Phase Extraction and Analysis by GC/MS.” PITTCON 2003, Orlando, Florida, March 9-14, 2003.

Momplaisir, G.M., C.G. Rosal; E.M. Heithmar “Arsenic Speciation Methods for Studying the Environmental Fate of Organoarsenic Animal-Feed Additives,” U.S. EPA, NERL-Las Vegas, 2001; (TIM No. 01-11). This peer-reviewed document is available at: http://www.epa.gov/nerlesd1/chemistry/labmonitor/labresearch.htm

Momplaisir, G.M., Betowski, L.D., and Winnick, W. “Determination of Nine Organoselenium Compounds Using High-Performance Liquid Chromatography Coupled with Electrospray Mass Spectrometry” 46th ASMS Conference on Mass Spectrometry and Allied Topics, Orlando, Florida, June 1-5, 1998.

Marshall, W.D. and Momplaisir, G.M.,“Chromatographic Approaches to Trace Element Speciation” in Metal Speciation and Bioavailability in Aquatic Systems, Tessier, A., and Turner, D. Eds. , John Wiley and Sons LTD. 1995, Chap. 7.

Momplaisir, G.M., Lei, T., and Marshall, W.D. “Performance of a Novel Silica T-tube Interface for the AAS Detection of Arsenic and Selenium Compounds in HPLC Column Eluate,” Anal. Chem. 1994, 66,3533-3539.

Environmental Sciences | Research & Development
National Exposure Research Laboratory
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