| polychlorinated biphenyls |
Polychlorinated biphenyls (PCBs) are a class of organic compounds with 1 to 10 chlorine atoms are attached to biphenyl and a general structure of C12H10-xClx. Most PCB congeners are colorless, odorless crystals. The commercial mixtures are clear viscous liquids (the more highly chlorinated mixtures are more viscous, for example, Aroclor 1260 is a "sticky resin"). ...
출처: en.wikipedia.org/wiki/Polychlorinated_biphenyls
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| polychlorinated biphenyls |
A group of toxic, persistent chemicals used in electrical transformers and capacitors for insulating purposes, and in gas pipeline systems as a lubricant. The sale and new use of PCBs were banned by law in 1979.
출처: www.nsc.org/ehc/glossar1.htm
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| polychlorinated biphenyls |
Toxic human-made compounds developed in 1929 and manufactured until 1977. They were used in a variety of products, such as transformers and fluorescent light ballasts. They are chemically inert and not biodegradable, and therefore banned in 1979. However, since products already in use didn't have to be replaced, they are still being introduced into our environment. Found in surface and groundwater, they are drawn to sediment, where they can remain indefinitely. ...
출처: www.ecohealth101.org/glossary.html
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| polychlorinated biphenyls |
A group of toxic, carcinogenic organic compounds containing more than one chlorine atom. PCB's were used in the manufacture of plastics and as insulating fluids in electrical transformers and capacitors. They behave much like DDT in the environment in that they are very stable compounds and are also fat-soluble; therefore, they accumulate in ever-higher concentrations as they move up the food chain. The use of PCB's was banned in the United States in 1979.
출처: biology.usgs.gov/s+t/SNT/noframe/zy198.htm
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| polychlorinated biphenyls |
Compounds derived from the hydrocarbon biphenyl by the replacement of from one to ten of the hydrogen atoms with chlorine atoms (PCB's).
출처: www.hillsdale.edu/AcademicAssociations/Chemistry/s...
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