PCBs

Sonny Morin

PCBs Have a Long-lasting Effect on the Environment

PCBs were originally an electrical insulators because they do not easily react chemically. They were commonly used in power transformers and capacitors as coolant. In 1977 it was discovered that PCBs were starting to become widespread in the environment and its use production was halted. PCBs are very impervious to decomposition by organic agents. Therefore they quickly accumulate and circulate through the environment. PCBs are not soluble in water and on bodies of water, tend to float on top and evaporate into the atmosphere. This then turns into rain water and is deposited on land. This is especially harmful when it deposits on crops. Although use of the biphenyl has ceased, it is expected that the circulation of PCBs will continue for decades.

Unknown Terms: biphenyl, PCB
· Biphenyl is an organic compound that is yellow in color and is an aromatic hydrocarbon.
· PCB – polychlorinated biphenyl

This article reminded me of the talk of DDTs and how they were also found throughout the environment through their use. I read an article once that talked about the increase of beached Orca whales in the northwest. Tests were done on the beached Orca whales and high levels of PCBs and DDTs were found and were thought to be the cause of death. I would think that the Orcas are exposed when they play or feed at the surface of the water.

Baird, C. Chemistry in Your Life. W.H. Freeman and Company Press: USA, 2006; pp 399-400.