Dating aroclors new england
As the degree of chlorination increases, melting point and lipophilicity increase, and vapour pressure and water solubility decrease.They can generate extremely toxic dibenzodioxins and dibenzofurans through partial oxidation.
Because of PCBs' environmental toxicity and classification as a persistent organic pollutant, PCB production was banned by the United States Congress in 1979 and by the Stockholm Convention on Persistent Organic Pollutants in 2001. Environmental Protection Agency (EPA), PCBs cause cancer in animals and are probable human carcinogens.This article describes various applications, environmental impact and various analyses available.Several common analytical procedures were used to compare concentrations of cyanide from groundwater samples from an area that was impacted by cyanide-containing residuals.In PCBs, some of the hydrogen atoms in biphenyl are replaced by chlorine atoms.(Elements & Compounds) any of a group of compounds in which chlorine atoms replace the hydrogen atoms in biphenyl: used in industry in electrical insulators and in the manufacture of plastics; a toxic pollutant that can become concentrated in animal tissue.
PCBs are generally referred to as Aroclors and are chemically comprised of 209 isomers or congeners.