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The method with Hg detection limit of 1 ng/L, is > than 50 times more sensitive than previously reported techniques, & may have broader potential to determine levels of other toxic metals. Researchers introduced Me 200HgCl & 201HgCl2 into water tanks stocked with algae & added Daphnia, a type of zooplankton, 2 days later. Daphnia which feed on algae, are a primary food for many species of fish. ICP-MS data show that the algae accumulate both organic & inorganic Hg, yet the Daphnia preferentially accumulate MeHg+. The data also show that when more algae are present , the wider dispersal of Hg results in lower dietary intake of MeHg+ by Daphnia. Both observations shed light on how Me Hg can bioaccumulate in fish
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