There is an obvious incentive to develop the capability of calculating the concentration of toxic substances in the water column, sediments, and biota in lakes as a function of the emission rate, the substances' partitioning and reaction properties, and the lake hydrodynamics. The fugacity approach is reviewed briefly as a method of calculating (i) the mass balance, (ii) partitioning and rates of exchange with air, biota, and sediment, (iii) advective loss, and (iv) degradation processes for a specimen toxic substance. The further problem of calculating concentration distribution in the lake as a result of locally high emission rates is treated and it is suggested that the methodology may be used to calculate concentrations in such near-source zones which may be designated for limited use as a result of relatively high levels of contamination.

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