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Marine lab research tracks pollutants in dolphins and beluga whales
Date:5/11/2011

HCB).

Overall, PCBs were the pollutants found in the highest concentrations across the 14 sampling locations, followed by DDT, other pesticides and PBDEs, and HCB. Levels for POPs were statistically higher in dolphins living and feeding in waters near more urban and industrialized areas. The exceptions were the PCB levels recorded in dolphins living in waters near Brunswick, Ga., contaminated from a former factory that is now an Environmental Protection Agency "Superfund" cleanup site. These PCB levels were the highest ever observed in a group of living marine mammals.

In the second study, a NIST team analyzed the levels of 12 PFCs in livers harvested from 68 beluga whales (Delphinapterus leucas) that had lived and fed in two Alaskan locations: Cook Inlet in the urban southern part of the state and the Chukchi Sea in the remote northern part. The samples were collected from 1989 to 2006 by Native Alaskans during subsistence hunts and stored at NIST's National Marine Mammal Tissue Bank (NMMTB). This was the first study to look at the concentration of PFCs in belugas from Alaska.

PFCs have been used as nonstick coatings and additives in a wide variety of goods including cookware, furniture fabrics, carpets, food packaging, fire-fighting foams and cosmetics. They are very stable, persist for a long time in the environment and are known to be toxic to the liver, reproductive organs and immune systems of laboratory mammals.

PFCs were detected in all of the beluga livers, with two compoundsperfluorooctane sulfonate (PFOS) and perfluorooctane sulfonamide (PFOSA)found in more than half the samples. All but one of the PFC concentrations measured were significantly higher in the Cook Inlet belugas, an expected result given the nearby urban, industrialized area. The exception was PFOSA, where levels were higher amongst the Chukchi Sea whales. The researchers are unsure if this is the result of the pollutant being carried into the remote reg
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Contact: Michael E. Newman
michael.newman@nist.gov
301-975-3025
National Institute of Standards and Technology (NIST)
Source:Eurekalert

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