Indoor polybrominateddiphenyl ethers in urban China: An exposure and risk assessment based on settled dust from selected urban regions.


In this study, measurements of seven typical polybrominateddiphenyl ethers (PBDEs) in indoor settled dust were summarized in selected urban regions of China. BDE-209 was the most dominant congener in settled dust (1.4-101 ?g/g), with a mean contribution of 95%. Indoor exposures to PBDEs were estimated via inhalation, dust ingestion, and dermal absorption. The average daily intake of ?PBDE was 4.9 to 19.1 ng/day/kg for all the population groups, with >80% of the total exposures from dust ingestion. Exposures in commuting environments (contributing 60%-80% of the total exposures) were higher than those in other microenvironments. The means of hazard indexes ranged from 1.66 × 10-3 to 5.26 × 10-3, which were mainly as a result of exposure to BDE-209, BDE-47, and BDE-99. The average lifetime cancer risks were from 0.03 × 10-9 to 2.37 × 10-9, which indicated the acceptable health risks resulting from indoor PBDE exposure for the Chinese population. The present study could provide valuable information that could be helpful for decision-makers, analysts and researchers to develop, implement and evaluate the effectiveness of interventions for the reduction of exposures to semi-volatile organic compounds (SVOCs) for large population groups in China.

Authors: Bu Z, Xu Z, Xu Q, Mmereki D, Wang J, Cheng Z, Li K, Dong C Full Source: The Science of the total environment. 2020 Jan 20;714:136808. doi: 10.1016/j.scitotenv.2020.136808. [Epub ahead of print]