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Page Title: Cas No. 1336-36-3
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Polychlorinated Biphenyls
(PCBs, Aroclors)
Cas No. 1336-36-3
Potential exposure
Polychlorinated biphenyls (PCBs) are a family of man-made chemicals that
contain 209 individual compounds (referred to as congeners). Some commercial
PCB mixtures are referred to by their industrial trade name, Aroclor. Due to their
thermal stability, inflammability, and dielectric capability, PCBs were used in
electrical capacitors and transformers. Although PCBs are no longer
manufactured or used in this country, they have entered the environment from
accidental spills, leaks from transformers or capacitors, or mismanaged electrical
equipment wastes. Due to their chemical properties, PCBs are persistent in the
environment; they do not readily break down and are bioconcentrated in the food
chain. Humans might be exposed to PCBs in contaminated air, water, soils or
food, such as fish.
Physical and chemical properties
Property
Value
For Aroclor 1260
Molecular weight
375.7 g/mol
Water solubility
0.0027 mg/L
4.05 10-5 mm Hg at 25 oC
Vapor pressure
Koc
no data available
log Kow
6.8
4.6 10-3 atm-m3/mol at 25 oC
Henry's Law Constant
Toxicity
Exposure to PCBs has caused dermatologic effects, in particular, chloracne.
Cases of severe chloracne were reported in by workers exposed for 2 to 4 years
in which PCB air levels were between 5.2 and 6.8 mg/m3 (ATSDR 1991). Other
effects might include dry sore throat, skin rash, gastrointestinal disturbances, eye
irritation, and headache with inhalation exposures below 0.15 mg/m3 PCB. There
is some evidence of liver cancer in humans when exposed to PCBs via the
inhalation, gastrointestinal, or dermal pathways. Confounding factors in these
studies include the simultaneous exposure to polychlorinated dibenzofurans.
Higher blood PCB levels are associated with elevated serum triglyceride and/or
cholesterol levels, as well as elevated blood pressure. Some of these effects are
D63
Appendix D Toxicological Profiles

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