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Why Mercury Is More Dangerous in Oceans Monday, June 28, 2010 - Ehud Rattner Home >> Headlines >> General Science   
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Even though freshwater concentrations of mercury are far greater than those found in seawater, it's the saltwater fish like tuna, mackerel and shark that end up posing a more serious health threat to humans who eat them. The answer, according to Duke University researchers, is in the seawater itself. The potentially harmful version of mercury - known as methylmercury - latches onto dissolved organic matter in freshwater, while it tends to latch onto chloride. (source: sciencedaily.com)
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