Distribution in Aquatic and Amphibian Biota

Similarly, Huhnerfiiss etal. [107, 117] detected PCBs in marine and limnic biota tissues. The authors reported the presence of these xenobiotics in blue mussels (Mytilus edulis). Toxaphene pesticide was used in the southeastern US states for cotton and soya bean crops, but was subsequently banned by the EPA in 1986, due to its long persistence. Hoekstra et al. [118] collected blubber and liver samples from the bowhead whale (Balaena mysticetus) in Canada in 1997-8. The authors reported the presence of eight chiral PCB congeners (PCBs 91, 95,135,136,149,174, 176 and 183) in these samples. De Cues et al. [119] reported the presence of toxaphene, produced in large quantities similar to those of polychlorinated biphenyls. 

To examine the influence of diet and age on organochlorine (OC) contaminant concentrations in two closely related ringed seal populations, enantiomeric fractions of chiral contaminants and stable isotopes of nitrogen ( N) and carbon ( C) were measured along with OCs in ringed seals collected from the east and west sides of the Northwater Pol5mya by Fisk etal. [120]. Seals from these two locations were allowed to feed at the same trophic level, based on values in muscle, but had slightly different sources of carbon, based on measurements in muscle. After removal of 

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