Abstract
Mixed halogenated dimethyl bipyrroles (HDBPs), which are thought to be produced naturally, were quantified in whale and dolphin products marketed for human consumption in Japan. The major component of HDBPs was 3,3′,4,4′-tetrabromo-5,5′-dichloro-1,1′-dimethyl -2,2′-bipyrrole (Br4Cl2-DBP), accounting for 85% of the total of five HDBPs detected, followed by Br3Cl2-DBP. Mean concentrations of HDBPs ranged from 0.27 μg/g lipid (n = 31) in minke whale (Balaenoptera acutorostrata) from the northwest Pacific Ocean to 11.8 μg/g lipid (n = 33) in bottlenose dolphin (Tursiops trucatus) from the southwest Japanese coastal water. At higher levels, HDBPs made up 37% of the total organohalogen body burden in Dall’s porpoise (Phocoenoides dalli), whereas the contribution was less than 8.9% in minke whales. In two data subsets from Baird’s beaked whale (Berardius bairdii), the products from the Pacific Ocean contained significantly higher concentrations of HDBPs than those from the Sea of Japan. Furthermore, the geographical distribution of HDBPs did not resemble those of ubiquitous anthropogenic organochlorines, such as polychlorinated biphenyl (PCBs). Higher concentration ratios of ΣHDBP/ΣPCB and different patterns of HDBP congeners were observed in whale products from the Asia-Pacific as compared to non-Pacific Ocean mammals reported previously. These results support the hypothesis that HDBPs and anthropogenic organochlorines have different sources and that the consumption of HDBPs by Japanese individuals could be an exposure/health risk.
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Acknowledgments
The authors wish to thank Dr. S. Baker, University of Auckland, New Zealand for his helpful identification of species. This work was supported by Grants-in-Aid from the International Fund for Animal Welfare (IFAW), and from the Japan Society for the Promotion of Science (B17404006).
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Haraguchi, K., Hisamichi, Y. & Endo, T. Bioaccumulation of Naturally Occurring Mixed Halogenated Dimethylbipyrroles in Whale and Dolphin Products on the Japanese Market. Arch Environ Contam Toxicol 51, 135–141 (2006). https://doi.org/10.1007/s00244-005-1140-2
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DOI: https://doi.org/10.1007/s00244-005-1140-2