Contact Dr. Togwell A. Jackson:

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Member of Geochemical Society, International Association of Geochemistry, and Society of Environmental Toxicology and Chemistry

Collaboration with scientists in Environment Canada, Fisheries and Oceans Canada, and universities (e.g. McMaster University, Université Laval, and the University of Victoria)

Former Adjunct Professor, University of Manitoba; served as External Examiner for Ph.D. students at University of Manitoba and University of Saskatchewan


Ph.D. Geology, University of Missouri; M.Sc. Geology, University of Wisconsin; B.A. Geology, Columbia University. Awarded A.P. Green fellowship in clay mineralogy.

Postdoctoral positions: Woods Hole Oceanographic Institution; Yale University; University of California, Santa Barbara. Awarded National Science Foundation fellowship.

Elected to Sigma Xi and Rawson Academy of Aquatic Science. Awarded grants through special government programmes (MITE, NEI, Canada Water Act initiatives, etc.)


Dr. Togwell A. Jackson

Research Scientist - Study Leader, Biogeochemistry of Mercury and Other Heavy Metals in Freshwater Ecosystems

CURRENT S&T / RESEARCH - Research on the biogeochemical pathways of mercury and other heavy metals and the ecotoxicology of bioavailable metal species in various freshwater environments

  • Research on variations in the stable isotope composition of mercury in sediment cores and food web organisms from mercury-polluted lakes in different regions of Canada to gain new insights into the sources and biogeochemical pathways of mercury
  • Research employing energy dispersive X-ray microanalysis and transmission electron microscopy to investigate the partitioning and accumulation of heavy metals by bacteria and colloidal particles in sediments of lakes polluted with mine or smelter wastes
  • Research employing rRNA analyses and a wide range of biochemical and geochemical methods of analysis to investigate effects of heavy metals from mine tailings on the phylogenetic makeup and activities of in situ bacterial communities in lake sediments
  • Research on the biogeochemistry and ecological effects of heavy metals in lakes polluted with mine tailings or smelter fallout, with particular attention to the speciation and bioavailability of the metals and the toxicity of the metals to aquatic organisms
  • Research on the biogeochemistry of mercury in lakes, river-lake systems, and reservoirs, with emphasis on the speciation, bioavailability, and bioaccumulation of mercury and factors that affect the activities of methylating and demethylating bacteria in sediments


Study Leader in many research projects on the biogeochemistry of mercury and other heavy metals, including three Canada Water Act investigations of mercury in mercury-polluted river-lake systems and hydroelectric reservoirs, as well as studies of heavy metals in lakes polluted with mine tailings or smelter emissions, or both

Earlier research on phosphorus binding by humic matter in lakes, effects of humic matter on primary production in lakes, Precambrian evolution as revealed by organic "chemical fossils," biologically mediated chemical weathering and secondary mineral genesis, prebiotic polypeptide synthesis on clay crystals, and analysis of Precambrian varves

Multiple publications in scientific journals and books and presentations at international scientific conferences, sometimes by invitation; Several critical reviews published as book chapters or journal articles, most of which were invited contributions

Member of Environmental Resource Group appointed under the Canada Environmental Protection Act (CEPA) to advise the government on environmental effects of copper and zinc smelters and refineries; Served as Adjunct Professor at University of Manitoba. Often called upon to review manuscripts on behalf of journal editors


Jackson, T.A., D.M. Whittle, M.S. Evans and D.C.G. Muir. 2008. Evidence for mass-independent and mass-dependent fractionation of the stable isotopes of mercury by natural processes in aquatic ecosystems. Applied Geochemistry 23: 547-571.

Jackson, T.A. 2008. Interactions between heavy metals, colloidal minerals, and microorganisms - their environmental significance. Proc. 35th Internat. Symp., National Academy of Sciences, Republic of Korea (Seoul, Korea; Oct., 2008), pp. 25-132. [Critical review; invited contribution.]

Jackson, T.A., D.C.G. Muir and W.F. Vincent. 2004. Historical variations in the stable isotope composition of mercury in Arctic lake sediments. Environ. Sci. Technol. 38: 2813-2821.

Jackson, T.A. and G.G. Leppard. 2002. Energy dispersive X-ray microanalysis and its applications in biogeochemical research. In: Violante, A., Huang, P.M., Bollag, J.-M., and Gianfreda, L. (eds.), Developments in Soil Science, vol. 28A, pp. 219-260. Elsevier Science B.V., Amsterdam. [Critical review; invited contribution.]

Jackson, T.A., M.M. West and G.G. Leppard. 1999. Accumulation of heavy metals by individually analysed bacterial cells and associated nonliving material in polluted lake sediments. Environ. Sci. Technol. 33: 3795-3801.

Jackson, T.A. 1998. Mercury in aquatic ecosystems. In: Langston, W.J. and Bebianno, M.J. (eds.), Metal Metabolism in Aquatic Environments, pp. 77-158. Chapman & Hall, London. [Critical review; invited contribution.]

Expertise Categories associated with this S&T Expert:

Pollution & Waste
     Water Quality
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