Lec21_Mercury

Lec21_Mercury - Lecture 21: Mercury (Hg) CHEM/ENVS 380 May...

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Appearance:  Silvery white, liquid metal. Speciation:   Oxidation states:  Hg(0), Hg(I) mercurous,  Hg(II) mercuric Inorg compounds:  e.g., HgCl 2 , HgS, various  complexes Org compounds:  e.g., methylmercury(II)  dimethylmercury(II) Occurrence:  Found mostly in Earth’s crust,  primarily as cinnabar (HgS)  Properties:   Only metal that is liquid at room temp (as  Hg 0 ) Volatile (Hg 0 , dimethylmercury) Readily forms alloys with most metals Toxic Lecture 21: Mercury (Hg) CHEM/ENVS 380 May 11, 2010 1. What is speciation? 2. How do toxicity and mobility of Hg vary according to speciation? 3. What makes the work of Cristol and associates worthy of a publication in Science (vol 320, 2008)? 4. What are the major uses of Hg? What are the major emission sources? 5. What are the possible scenarios for the fate of Hg deposited in a lake?
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How Does Hg Speciation Affect Toxicity? Speciation = chemical state of element or compound
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This note was uploaded on 09/23/2011 for the course CHEM 380 taught by Professor Staff during the Spring '11 term at S.F. State.

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Lec21_Mercury - Lecture 21: Mercury (Hg) CHEM/ENVS 380 May...

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