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Assume that, in a polluted lake, the concentration of P b in the fish is about 1 0 p p b . An adult living

Assume that, in a polluted lake, the concentration of Pb in the fish is about 10ppb. An adult living around the lake eats about 1kg of fishes per day. After a long time, the concentration of Pb accumulated in a local adult is 5ppm. Please estimate how long the Pb can remain in the body of local people.
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