Refine search
Results 1-7 of 7
Trace elements in striped dolphins (Stenella coeruleoalba) from the western Mediterranean
1998
Monaci, F. | Borrel, A. | Leonzio, C. | Marsili, L. | Calzada, N. (Dipartimento di Biologia Ambientale, Universita degli Studi di Siena, via delle Cerchia 3, 53100 Siena (Italy))
Anthropogenic Mercury Deposition to Arctic Lake Sediments
1998
Hermanson, Mark H.
The history of atmosheric mercury inputs to remote arctic regions can be measured in lake sediment cores using lead-210 chronology. In this investigation, total mercury deposition is measured in sediments from Imitavik and Annak Lakes on the Belcher Islands in southeastern Hudson Bay, an area in the southern Canadian Arctic with no history of local industrial or agricultural sources of contamination. Both lakes received background and atmospheric inputs of mercury while Annak also received mercury from raw domestic sewage from the Hamlet of Sanikiluaq, a growing Inuit community of about 550 established in the late 1960's. Results from Imitavik show that anthropogenic mercury inputs, apparently transported through the atmosphere, began to appear in the mid-eighteenth century, and continued to the 1990's. Annak had a similar mercury history until the late 1960's when disposal of domestic sewage led to increased sediment and contaminant accumulation. The high input of mercury to Annak confirms that Sanikiluaq residents are exposed to mercury through native food sources.
Show more [+] Less [-]Mercury pollution and the Saimaa ringed seal (Phoca hispida saimensis)
1998
Hyvarinen, H. | Sipila, T. | Kunnasranta, M. | Koskela, J.T. (Department of Biology, University of Joensuu, P.O. Box 111, FIN-80101 Joensuu (Finland))
Environmental contaminants in tissues of a neonate St Lawrence beluga whale (Delphinapterus leucas)
1998
Gauthier, J.M. | Pelletier, E. | Brochu, C. | Moore, S. | Metcalfe, C.D. | Beland, P. (Trent University, Environmental and Resources Studies Program, Peterborough, Ontario K9J 7B8 (Canada))
An Emissions Inventory for Regional Atmospheric Modeling of Mercury
1998
Pai, Prasad | Heisler, S. (Steven) | Joshi, Aruna
Estimates of mercury emissions from individual sources and source categories are needed to understand relationships between the emissions and resulting deposition and to evaluate possible approaches to reducing those emissions. We have developed geographically-resolved estimates of annual average mercury emission rates from current anthropogenic sources in the 48 contiguous United States. These estimates were made by applying emission factors to individual facility operating data and to county-wide source activity levels. We apportioned the emissions to an Eulerian modeling grid system using point source coordinates and the fractions of county areas in each grid cell. Point sources account for about 89% of the 48-state total mercury emissions of 146.4 Mg/yr. Most of the emissions in the inventory are from combustion of mercury-containing fossil fuels and municipal waste, located primarily in the mid-Atlantic and Great Lakes states as well as in the Southeast. The major uncertainties in the emission estimates are caused by uncertainties in the emission factors used to develop the estimates. This uncertainty is likely a result of variability in the mercury content of the combusted materials and in the removal of mercury by air pollution control devices. The greatest research need to reduce uncertainties in mercury emission estimates is additional measurements to improve emission factors.
Show more [+] Less [-]Mercury accumulation in transplanted Hypogymnia physodes lichens downwind of Wisconsin chlor-alkali plant
1998
Bennett, J.P. (Wisconsin Dept. of Natural Resources, Madison, WI (USA). Bureau of Air Monitoring) | Makholm, M.M.
Mercury in precipitation and its relation to bioaccumulation in fish: a literature review
1998
Downs, S.G. (Imperial Coll. of Science, Technology and Medicine, London (United Kingdom). Imperial Coll. Centre for Environmental Technology) | Macleod, C.L. | Lester, J.N.