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Exposure of Canadian aboriginal peoples to methylmercury

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Abstract

Aboriginal peoples living a traditional lifestyle are potentially exposed to contaminants, such as methylmercury (MeHg), which bioaccumulate in aquatic ecosystems. A preliminary analysis of testing of Canadian indigenous people for MeHg from 1970 to 1992 is outlined. By December 1992,71,842 tests of 38,571 individuals had been carried out in 514 native communities across Canada. Of these, 8,847 individuals (23%) had blood, or blood equivalent, MeHg levels greater than 20 μg/l and 608 (1.6%) had levels over 100 μg/l. Clinical examinations were offered to all with levels greater than 100 μg/l in blood, but were unable to produce a definitive diagnosis. In an attempt to ascertain fetal exposure, 2,405 umbilical cord blood samples were taken. In about half of these cases the samples were paired with maternal levels. Of the cord samples 523 (21.8%) were found to have levels greater than 20 μg/l, and the highest level was 224 μg/l. The highest maternal level found was 86 μg/l. A discussion of the assessment of risk from exposure to MeHg in this population is presented as are the initial results of the 20 year retrospective analysis including seasonal exposure patterns and trends in exposure levels. Probable future intiatives based on this analysis are noted.

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References

  • Berkes, F.: 1990, Native subsistence fisheries: A synthesis of harvest studies in Canada.Arctic 43(1), 35–42.

    Google Scholar 

  • Bishop, J.N., and Neary, B.P.: 1976,Mercury levels in Fish from Northwestern Ontario 1970–1975. Ontario Ministry of the Environment, Toronto.

    Google Scholar 

  • Bodaly, R.A., Hecky, R.E., and Fudge, R.J.P.: 1984, Increase in fish mercury levels in lakes flooded by the Churchill River diversion, northern Manitoba.Can. J. Fish. Aquat. Sci. 41, 682–691.

    Google Scholar 

  • Farant, J.P., Brissette, D., Moncion, L., Bigras, L., and Chartrand, A.: 1981, Improved cold-vapor atomic absorption technique for the microdetermination of total and inorganic mercury in biological samples.J. Anal. Toxicol. 5, 47–51.

    Google Scholar 

  • McKeown-Eyssen, E.E., and Ruedy, J.: 1983, Prevalence of neurological abnormality in Cree Indians exposed to methylmercury in northern Quebec.Clin. Inves. Med. 6, 161–169.

    Google Scholar 

  • Phelps, R.W., Clarkson, T.W., Kershaw, T.G., and Wheatley, B.: 1980, Interrelationships of blood and hair mercury concentrations in a North American population exposed to methylmercury.Arch. Environ. Health 35, 161–168.

    Google Scholar 

  • Rudd, J.W.M., Turner, M.A., Furutani, A., Swick, A.L., and Townsend, B.E.: 1983, The English-Wabigoon River system: I. A synthesis of recent research with a view towards mercury amelioration.Can. J. Fish. Aquat. Sci. 40, 2206–2217

    Google Scholar 

  • Wheatley, B.: 1979,Methylmercury in Canada: exposure of Indian and Inuit residents to methylmercury in the Canadian environment. Department of National Health and Welfare, Medical Services Branch, Ottawa. 200pp

    Google Scholar 

  • Wheatley, B., Barbeau, A., Clarkson, T.W., and Lapham, L.: 1979, Methylmercury poisoning in Canadian Indians — The elusive diagnosis.Can. J. Neurol. Sci. 6(4), 417–422.

    Google Scholar 

  • Wheatley, B., and Wheatley, M.A.: 1988, Methylmercury in the Canadian arctic environment past and present- natural or industrial? In: H. Linderholm et al. (Eds.) Circumpolar Health 87. Proceedingss of the 7th International Congress on Circumpolar Health, Umea, Sweden, June 8–12, 1987.Arct. Med. Res. 47 Supplement 1,163–167.

  • Wheatley, B.: 1993, Exposure of Canadian Aboriginal Peoples to Methylmercury. Paper presented to the International Symposium on “Assessment of Environmental Pollution and Health Effects of Methylmercury” Kumamoto, Japan, Oct. 8–9, 1993.

  • Wheatley, M.A. and Wheatley, B.: 1981, The effect of eating habits on mercury levels among Inuit residents of Sugluk, P.Q.Études/Inuit/Studies 5(1), 27–43.

    Google Scholar 

  • WHO: 1976,Environmental Health Criteria I. Mercury. World Health Organisation, Geneva.

    Google Scholar 

  • WHO: 1990,Environmental Health Criteria 101. Methylmercury. World Health Organisation, Geneva.

    Google Scholar 

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Wheatley, B., Paradis, S. Exposure of Canadian aboriginal peoples to methylmercury. Water Air Soil Pollut 80, 3–11 (1995). https://doi.org/10.1007/BF01189647

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