Abstract
Black-crowned night heron (Nycticorax nycticorax) eggs have been identified as useful indicators for biomonitoring the environmental pollution in China. In this study, we investigated thirty eggs of black-crowned night heron collected from the upper Yangtze River (Changjiang) Basin, Southwest China, for the occurrence of legacy persistent organic pollutants (POPs), including polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), and polybrominated diphenyl ethers (PBDEs). Our results showed a general presence of POPs in night heron eggs with OCPs being the dominant contaminants, having a geometric mean concentration of 22.2 ng g−1 wet weight (ww), followed by PCBs (1.36 ng g−1 ww), PBDEs (0.215 ng g−1 ww), and PCDD/Fs (23.0 pg g−1 ww). The concentration levels were found to be significantly higher in night heron eggs than in poultry eggs by one or two magnitude orders. Among OCP congeners, p,p′-DDE was found to be predominant in night heron eggs, with a geometric mean concentration of 15.1 ng g−1 ww. Furthermore, species-specific congener patterns in eggs suggested similar or different sources for different POPs, possibly associated with contaminated soil and parental dietary sources. Additionally, estimated daily intakes (EDIs) were used to evaluate non-carcinogenic and carcinogenic risk associated with consumption of bird eggs. Our results revealed non-negligible non-cancer and cancer risk for humans who consume wild bird eggs as a regular diet instead of poultry eggs.
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Acknowledgements
We would like to thank Professor Hua Ye from Yibin University for egg collecting work. Likewise, the authors appreciated chief specialist Päivi Ruokojärvi from Finnish National Institute for Health and Welfare for her help on chemical analysis.
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The study was financially supported by the Swedish Research Council through the Swedish-Chinese Cooperation project (Chemstrres-YRD, Dnr. 2013-6913), by the Tongji University through the interdisciplinary joint research project, and by the China Three Gorges Corporation through the research project.
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Lai Wei: formal analysis, validation, writing—original draft preparation; Qinghui Huang: conceptualization, resources, review and editing, supervision, funding acquisition; Yanling Qiu, Jianfu Zhao, and Hong Gao: conceptualization, visualization; Panu Rantakokko: methodology, chemical analysis; Fei Huang: investigation, resources; Anders Bignert and Åke Bergman: resources, visualization, review and editing.
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Wei, L., Huang, Q., Qiu, Y. et al. Legacy persistent organic pollutants (POPs) in eggs of night herons and poultries from the upper Yangtze Basin, Southwest China. Environ Sci Pollut Res 30, 93744–93759 (2023). https://doi.org/10.1007/s11356-023-28974-z
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DOI: https://doi.org/10.1007/s11356-023-28974-z