The Web page you requested was not found. Try the Lycos Find it index or return to the front page of Lycos. Please email us. Scientists wondering what effects these pollutants might have on dolphins and people living in the area. He tested them for a variety of pesticides and pollutants, including PCBs, and calculated the amounts and toxic equivalencies required for specific chemicals to prove dangerous to animals.
Many different combinations are possible.
In chemical terminology, phenyl means a ring structure of six carbon atoms attached to something else. Biphenyl results when two such rings are attached to each other. Chlorine atoms can be placed at any or all of ten available sites, with 209 PCB mixtures theoretically possible. While dolphin researchers found many forms of 209 different PCBs at low levels, the 10 dolphins carried an extremely toxic amount of a form known as non-ortho, coplanar PCBs. The non-ortho coplanar forms of PCBs are so toxic that even extremely small amounts can threaten animals, Busbee said.