User talk:Temperateant/sandbox

Mercury outline

(Incorporate this info into other sections)? o	Majority of anthropogenic hg in oceans deposited from atmosphere. Does not follow nutrient cycles, or follow distribution. Indications of transport through near-shore sediment in fish. Vertical distribution and thus has apparent scavenging signs (fitzgerald). Enters environment via volanoes and geothermic (and anthroprogenic) (fiu chpt 5). o o	MeHg o		found in ocean, part of chemical changes from hg (II), can change into hg0 or dmhg, found again in sediment (fitzgerald). o		-most toxic form (neurotoxin) (Liu chpt 5). o			-due to “lipophilic properties”,enhances bioaccumulation in aquatic food o	 Webs o		-inorganic methylation done by anaerobic, aerobic microbes as well as reduction. o		- o		B1)	dimethylmercury o			-found as result of hg (II), transforms back and into mmhg (fitzgerald). o		-mmhg is taken up by diet in unicellular organisms, and has slow rates of elimination relative to uptake (liu, chpt 8). o			-short lifetime, thought to advect into deep waters o	Hg(II) o		-enters as gas through atm, and goes through chemical transformations. Found again in sediment (Fitzgerald). o		-not bioaccumulated as efficiently as mmhg (liu, chpt 8). o	Hg(0) o		-found in atmosphere, surface water (fitzgerald). o		-solubility comparable to oxygen o		-supersaturated under ice but close to saturation in open water (Dimento) o		-main input of hg into ocean o	Ways hg is measured? (in fitzgerald). o	Inorganic mercury found a s cinnabar and metacinnabar (both minerals) (epa) o	-most commonly used mothhod for identifying hg is cold vapor atomic fluorescence detection (CVAFS) which takes advantage of elemental hg’s ability to fluoresce in a narrow uv spectrum (liu, chpt 2)
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Fitzgerald, William F, et al. “Marine Biogeochemical Cycling of Mercury.” Chemical Reviews, vol. 107, no. 2, 2007, pp. 641–662. Liu, Guangliang, et al. “Overview of Mercury in the Environment.” Environmental Chemistry and Toxicology of Mercury, John Wiley & Sons, Inc, Hoboken, NJ, USA, 2011, pp. 1–12.