Contents

J. Great Lakes Res. 25(4)
Internat. Assoc. Great Lakes Res., 1999
Gerald Matisoff, ed.

J. Great Lakes Res. 25(4):814-827.
Internat. Assoc. Great Lakes Res., 1999
Type: Article

A Modeling Strategy for Planning the Virtual Elimination of Persistent Toxic Chemicals from the Great Lakes: An Illustration of Four Contaminants in Lake Ontario

Shirley Thompson¹, Donald Mackay² and Matthew MacLeod², ¹Institute for Environmental Studies, University of Toronto, Toronto, Ontario, M5S 3E8; ²Environmental and Resource Studies, Trent University, Peterborough, Ontario, K9J 7B8

ABSTRACT: A systematic seven-step process is proposed as a strategy for planning “virtual elimination” of persistent toxic contaminants in the Great Lakes. The strategy involves (i) estimating loadings, (ii) gathering prevailing concentration data, (iii) obtaining physical-chemical property data for the chemicals of interest, (iv) obtaining data concerning conditions in the lake, (v) applying a relatively simple steady-state mass balance model incorporating an appropriate treatment of variability and uncertainty to reconcile the range of estimated concentrations with the range of monitoring data, (vi) identifying reasonable targets for loading reductions, and finally (vii) applying the model in dynamic form to estimate how future concentrations will respond to suggested loading reductions thus providing a set of targets for virtual elimination. The uncertainties in these estimates are quantified to convey an impression of their perceived accuracy. The strategy is illustrated for four contaminants (polychlorinated biphenyls, benzo(b)fluoranthene, arsenic, and lead) in Lake Ontario.

KEYWORDS: Model, toxicants, Lake Ontario, loading reductions.

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