Temporal Trends and Suspect Screening of Halogenated Flame Retardants and Their Metabolites in Blubbers of Cetaceans Stranded in Hong Kong Waters during 2013-2020.

45 However, an increasing trend of DPTE concentrations in mollusks from the Bohai Sea in China was observed between 2011 and 2018. 46 Currently, information on the scale and status of DPTE production/use is still ambiguous. 3 , 7 Further investigations on the emission pathways and ecotoxicity of DPTE are needed because of its widespread global occurrence. 3 , 39 − 41 Identification of HFR Metabolites and Novel HFRs in Cetacean Blubber Eight HFR metabolites and novel HFRs were identified using our suspect screening strategy with a mass error of <10 ppm and an isotope ratio difference of <10%.

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DPTE was the only novel HFR detected in more than half of the adult porpoise samples in this study. Significantly higher levels of DPTE were found in the porpoises stranded between 2013 and 2015 than those between 2016 and 2020 ( p < 0.01; Figure 2 ), indicating a decreasing trend of DPTE in recent years.

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