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Mass balance can serve as a valuable tool for resource managers to understand the current environmental concentrations of toxic chemicals and the complex pathways through the system, so that effective management strategies can be designed to reduce toxic loads, and to minimize human and ecosystem health risks.

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The Lake Michigan Mass Balance Study measured PCBs, mercury, trans-nonachlor, and atrazine in rivers, the atmosphere, sediments, lake water, and the food chain. A mathematical model will predict what effect reducing pollution will have on the lake, and its large fish (lake trout and coho salmon).

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