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mercury cycle
The mercury cycle is a biogeochemical cycle involving mercury. Mercury is notable for being the only metal which is liquid at room temperature. It is a volatile metal and evaporates, though it takes quite a while to do so.
==Processes==
Most natural mercury occurs as cinnabar, HgS. Here mercury (Hg2+) is bound very tightly to sulfur, but weathering slowly releases the mercury to the environment. There are also trace amounts of mercury in coal. Mining mercury or burning coal results in releasing mercury. Volcanoes and forest fires are also sources of mercury.
Chlorine factories, among other sources, release mercury into the atmosphere.〔 This mercury is deposited back onto land and water. Inorganic mercury can be converted by bacteria into the organometallic cation known as methylmercury, CH3Hg+, which bioaccumulates in fish such as tuna and swordfish.〔 Over long periods of time, some mercury recombines with sulfur and is buried in sediments. Then, the cycle repeats itself.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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