Brazil, PCBs, GC-ECNI-MS, PBDEs, Cetaceans, Polychlorinated Biphenyls - analysis, Dolphins - metabolism, Liver - metabolism, Environmental Monitoring - methods, Polychlorinated Biphenyls - metabolism, Halogenated Diphenyl Ethers - analysis, Water Pollutants, Chemical - analysis, Liver - chemistry, Halogenated Diphenyl Ethers - metabolism, Water Pollutants, C...