Polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans and dioxin-like polychlorinated biphenyls in cetaceans from Korean coastal waters

Abstract

Data on levels and accumulation profiles of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/ Fs) and dioxin-like polychlorinated biphenyls (PCBs) in cetaceans are scarce. This paper presents data on the concentrations and accumulation features of PCDD/Fs and dioxin-like PCBs in muscle of minke whales (Balaenoptera acutorostrata) and long-beaked common dolphins (Delphinus capensis) collected from Korean coastal waters. The residue levels in cetaceans were in the order of mono-ortho PCBs> non-ortho PCBs>PCDFs>PCDDs. Total toxic equivalent (TEQ) concentrations in muscle of minke whales and common dolphins from Korea were lower than those reported for cetaceans and seals from other countries. The accumulation profiles of PCDD/Fs and dioxin-like PCBs were different between the cetacean species. Concentrations of PCDD/Fs and dioxin-like PCBs in common dolphins were significantly higher than those measured in minke whales, due to differences in the habitat and diet. The relative contribution of individual chemical groups to total TEQs was different between the cetacean species, suggesting different exposures and metabolic activity.