Mercury

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Mercury

  1. 1.  
  2. 2.  Symbol: Hg Atomic number: 80
  3. 3.  Moderately active Mercury reacts at about 350°C to form Mercury II oxide 2Hg(s) + O2(g) → 2HgO(s) A red powder form of mercury Mercury does not react with non-oxidizing acids but it reacts with concentrated nitric acid, HNO3, and concentrated sulfuric acid, H2SO4
  4. 4.  Silver liquid at room temperature Melting point: -38.87 °C Boiling point: 356.58 °C High surface tension Good electricity conductor Insoluble
  5. 5.  Environment: Mercury vapor emitted from both natural and anthropogenic sources is distributed in the atmosphere. Itreturns as a water-soluble form in precipitation and ends up in bodies of water. Cells:Mercury is inhaled (vapor), ingested (eating fish exposed to mercury vapor or methyl mercury), or injected ( ethyl mercury used in vaccines) into cells.
  6. 6.  
  7. 7.  Natural sources: some mercury is released from natural sources like volcanoes and forest fires and as a result of normal breakdown of minerals in rocks and soil through exposure to wind and water Anthropogenic sources: coal burning power plants, industrial boilers, wastecombustors, thermometers, blood pressure gauges, clinicalreagents, lab chemicals, dental amalgams, fluorescent light tubes, switches, batteries, cosmetics, paint additives, pesticides Complete list of sources http://www.glrppr.org/docs/mercury_in_industry.htm
  8. 8.  Mercury and all of its compounds are toxic, exposure to excessive levels can permanently damage or fatally injure the brain and kidneys Organic compounds of mercury such as methyl mercury are considered the most toxic forms of the element. Exposures to very small amounts of these compounds can result in devastating neurological damage and death
  9. 9.  Mercury in the air may settle into water bodies and affect water quality Methyl mercury accumulates in fish at levels that may harm the fish and the other animals that eat them.
  10. 10.  Disruption of the nervous system Damage to brain functions o degradation of learning abilities, personality changes, tremors, vision changes, deafness, muscle incoordination and memory loss. Allergic reactions o skin rashes, tiredness, and headaches Reproductive effects, such as sperm damage, birth defects and miscarriages DNA damage and chromosomal damage

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