Environmental Science 3300F/G Lecture Notes - Lecture 19: Ethylenediaminetetraacetic Acid, Cysteine, Xenobiotic
18 Dec 2017
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Document Summary
metal collectively describes all elements other than hydrogen and helium. A material that is typically hard, opaque, shiny and has good electrical and thermal conductivity. The term: sink, is a useful one in the environment. Generally meant to refer to a permanent repository for a pollutant. Toxicity: the degree of strength of a poison. Acute toxicity describes the short term effects of a substance o. The effects should take place within 14 days to be considered acute. Differ from organics, they are not degradable to non-toxic forms o. The 5 metals of most concern are hg, pb, cd, cr and as. Toxic metals are always in their ionic form. All metals found in the human body are in their oxidized states. Earliest life was about 4 billion years ago (3. 8x10^9) Oldest well-defined organisms contain heat shock proteins. A hydrothermal vent is a fissure in a planet"s surface from which geothermally heated water.
