After years of measuring mercury in the estuary muck, in the fish and in the rain falling from the sky, scientists now say they know the culprit: Huge amounts of decades-old “legacy” mercury pollution stored in the sediment is still getting into the fish.
In a study published in the journal Science of the Total Environment, published online March 13, scientists from the Environmental Protection Agency’s Duluth laboratory, the U.S. Geological Survey and several other institutions used isotope “fingerprinting’’ to trace mercury in the fish all the way back to its source, differentiating old legacy mercury from new mercury falling from the sky.
Higher mercury in St Louis River walleyes in eastern Minnesota comes from old pollution
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Higher mercury in St Louis River walleyes in eastern Minnesota comes from old pollution
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Higher mercury in St Louis River walleyes in eastern Minnesota comes from old pollution
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