Emerging Persistent Organic Pollutants (POPs) in marine mammals from South China

Paul Kwan Sing LAM, B. Q. ZHU, Karen Y. KWOK, Chung Wah James LAM

Research output: Contribution to conferencePaper

Abstract

Halogenated flame retardants (HFRs) and perfluroalkyl substances (PFASs) are considered crucial components in manufacturing a wide variety of consumer products. Well-known examples of HFRs and PFASs are polybrominated diphenyl ethers (PBDEs) as well as perfluorooctane sulfonate (PFOS), respectively. Due to their persistence, toxicity, bioaccumulation and long-range transport potential, these chemicals have been added to the Persistent Organic Pollutants (POPs) list of the Stockholm Convention. Since the worldwide restriction on their production and use, the demand for these compounds is expected to decline, whereas that for their alternatives is projected to increase. Although these chemicals are banned or voluntarily phased out in the developed countries, some of these emerging POPs such as PFOS and PFOS-related chemicals are still produced in China currently. As Pearl River Delta (PRD) region is one of the most heavily industrialized and urbanized regions in China, it is conceivable that this region is contaminated by HFRs, PFASs and their replacements. Our recent monitoring study carried out in South China Sea has revealed that the highest PBDEs and PFAS concentrations in the environmental samples were observed in the region of PRD. HFRs and PFASs have emerged as global environmental contaminants, however, the information on these persistent toxic substances, particularly the changes in levels and patterns of their alternatives, is still very limited in the region. This study, therefore, aims to examine temporal trends in concentrations of HFRs and PFASs in two species of marine mammals, the Indo-Pacific humpback dolphin (Sousa chinensis) and finless porpoise (Neophocaena phocaenoides), in the PRD region of China. In addition, a preliminary risk assessment on these ecologically important marine species due to exposure to these groups of persistent and toxic substances was also conducted in this study.
Original languageEnglish
Publication statusPublished - Jun 2016

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marine mammal
sulfonate
toxic substance
PBDE
river
Stockholm Convention
porpoise
long range transport
dolphin
bioaccumulation
persistent organic pollutant
risk assessment
manufacturing
persistence
replacement
flame retardant
toxicity
pollutant
monitoring
chemical

Citation

Lam, J. C. W., Zhu, B. Q., Kwok, K. Y., & Lam, P. K. S. (2016, June). Emerging Persistent Organic Pollutants (POPs) in marine mammals from South China. Paper presented at The 2nd International Conference on Deriving Environmental Quality Standards for the Protection of Aquatic Ecosystems (EQSPAE 2016), The University of Hong Kong, Hong Kong, China.