Exploring the bioaccessibility of polybrominated diphenyl ethers (PBDEs) in sewage sludge

Environmental Pollution
Xiang-Zhou MengXiaohu Dai

Abstract

Environmental risks of polybrominated diphenyl ethers (PBDEs) in sewage sludge are assessed based on the concentration by exhaustive extraction, which is a likely overestimation of the pool available to exposed organisms. This study evaluated the bioaccessibility of PBDEs in sewage sludge from Shanghai using a 3-compartment model and a 6-d Tenax extraction. The very slowly fraction contributed 56-88% of total PBDEs in spiked sludge, whereas the rapidly desorbing fraction contributed only 1.1-10%. For the same PBDE congener, the rapidly desorbing fractions for sewage sludge measured in the present study were lower than those for sediment. The bioaccessible concentrations of PBDEs were 2.3-56 ng/g dry weight in sewage sludge from Shanghai, which represented 5.2% of the concentration determined by exhaustive (Soxhlet) extraction. BDE-209 was the predominant congener in sludge, contributing to 63% of the total. Moreover, the Ratio between 6-h Tenax and Soxhlet concentrations (T/S Ratio, indicating bioaccessibility) was lower in sludge generated from industrial wastewater treatment compared to sludge from facilities that treated mostly domestic wastewater. The T/S Ratio of PBDE congeners was related to KOW, specifically as KOW incre...Continue Reading

References

May 18, 2006·Environmental Toxicology and Chemistry·Fredrik Reichenberg, Philipp Mayer
Sep 28, 2010·Environmental Pollution·Honglin HuangPeter Christie
Mar 18, 2011·Journal of Environmental Monitoring : JEM·Jing YouMichael J Lydy
Nov 30, 2013·Integrated Environmental Assessment and Management·Philipp MayerBeate I Escher

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Citations

Jun 22, 2021·Journal of Environmental Health Science & Engineering·Chinemerem Ruth OhoroOmobola Oluranti Okoh

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