Occurrence and Health Risks of Halogenated Flame Retardants in Soils: Association with E-Waste Dismantling, Urbanization and Industrialization

Sun, Jianqiang; Li, Wangying; Xu, Honglei; Li, Shiyuan; Fang, Li; Qing, Xia; Tao, Ninger; Wu, Cheng; Zhang, Anping

doi:10.2139/ssrn.4033192

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“…Moreover, the PRD is located at the confluence of rivers and marine ecosystems and is subjected to high-intensity external disturbance, which leads to an increase in the release rate of pollutants discharged by anthropogenic sources into the PRE. PBDE pollution is usually associated with high levels of industrialization and urbanization, and the dismantling and recycling of e-waste activities are also important factors . The PRE is mainly discharged by four tributaries: the Pearl River and Dong River flow into the EP, while the Xijiang River and Beijiang River flow into the WP.…”

Section: Resultsmentioning

confidence: 99%

“…PBDE pollution is usually associated with high levels of industrialization and urbanization, and the dismantling and recycling of e-waste activities are also important factors. 78 The PRE is mainly discharged by four tributaries: the Pearl River and Dong River flow into the EP, while the Xijiang River and Beijiang River flow into the WP. The Pearl River and Dongjiang River flow through Guangzhou, Dongguan, Foshan, and Shenzhen, which are the most prosperous cities and the largest electronics manufacturing region in China.…”

Section: Pbde Concentrations Inmentioning

confidence: 99%

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Long-Term Monitoring of Polybrominated Diphenyl Ethers (PBDEs) in Indo-Pacific Humpback Dolphins (Sousa chinensis) from the Pearl River Estuary Reveals High Risks for Calves due to Maternal Exposure

Xie

Gui

2022

Environ. Sci. Technol.

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Although many studies have documented the wide occurrence of polybrominated diphenyl ethers (PBDEs) in cetaceans, little evidence exists regarding the detrimental effects of PBDE exposure on calf death rates for freeranging cetaceans. This study analyzed life-history-associated PBDE bioaccumulation patterns in 128 stranding Indo-Pacific humpback dolphin (Sousa chinensis) samples over an 18-year timespan from the Pearl River Estuary (PRE). In comparison to the records of PBDE levels in cetaceans worldwide, the median levels of PBDEs (median = 10600 ng g −1 lw, range = 721−50900 ng g −1 lw) in all samples were the highest to date. One-way analysis of variance (ANOVA) showed that adult males (median = 16100 ng g −1 lw, range = 4070−50900 ng g −1 lw) and calves (12000 ng g −1 lw, range = 1250−35300 ng g −1 lw) both had the highest levels of PBDEs compared to the rest of the age/sex groups (p < 0.05). Concentrations of PBDEs in noncalves significantly decreased over the studied period, while those in calves had a slightly increasing trend, which may be due to different exposure routes via fish or milk, respectively. A significant and positive relationship was found between annual calf stranding death rates and body-length-adjusted PBDE concentrations in calves (r = 0.62, p < 0.05), suggesting that maternal exposure of calves to elevated levels of PBDEs may have contributed to the high annual stranding death rates of calves in the last two decades.

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Section: Resultsmentioning

confidence: 99%

Section: Pbde Concentrations Inmentioning

confidence: 99%