Editing Great Lakes (section)

==== Mercury ====
Until 1970, [[Mercury (element)|mercury]] was not listed as a harmful chemical, according to the United States Federal Water Quality Administration. In the 21st century, mercury has become more apparent in water tests. Mercury compounds have been used in paper mills to prevent slime from forming during their production, and chemical companies have used mercury to separate chlorine from brine solutions. Studies conducted by the [[United States Environmental Protection Agency|Environmental Protection Agency]] have shown that when the mercury comes in contact with many of the bacteria and compounds in the fresh water, it forms the compound [[Methylmercury|methyl mercury]], which has a much greater impact on human health than elemental mercury due to a higher propensity for absorption. This form of mercury is not detrimental to a majority of fish types, but is very detrimental to people and other wildlife animals who consume the fish. Mercury has been known for health related problems such as birth defects in humans and animals, and the near extinction of eagles in the Great Lakes region.<ref>{{cite web |url = http://www.idph.state.il.us/envhealth/factsheets/mercuryspills.htm |title = Mercury Spills |publisher = Idph.state.il.us |access-date = February 19, 2011 }}</ref>