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• W772443973 abstract "Due to high affinity for organic carbon phase, hydrophobic organic contaminants (HOCs) preferentially deposit in bed sediments in surface aquatic systems. Consequently, many contemporary sediment contaminants are HOCs, including DDTs, PCBs, and PBDEs. However, their accumulation potential and toxicity to benthic organisms in sediments are regulated by bioavailability, rather than bulk chemical concentrations. The overall purpose of the current project was to develop and apply chemically-based methods to explore bioavailability of HOCs in sediments, and help improve the assessment of their potential ecotoxicological risks and sometimes human health effects in the environment.A solid phase microextraction (SPME) method using disposable polydimethylsiloxane (PDMS) fibers was developed for measuring the phase distribution of flame retardant PBDEs in sediments. Results showed that PBDEs were predominantly sorbed to the sediment phase, with freely dissolved concentration (Cfree) only accounted for 2 =0.84&ndash0.94). Bioavailability measurements from the SPME, IDM and Tenax methods were compared in amendment-based remediation. After normalizing over the unamended sediments, significant linear correlations (R 2 >0.90, p <0.01, slopes=1.00&ndash1.09) were found between these methods, suggesting they are interchangeable or complementary for evaluating remediation efficiency or progress.Overall, the bioavailability estimation methods or their specific applications developed from this project will improve understanding environmental fate of HOCs and their potential toxicity to such organisms as the sediment-dwelling invertebrates. The developed methods may be readily adoptable for other HOCs as well as other matrices (e.g., soil)." @default.
• W772443973 created "2016-06-24" @default.
• W772443973 creator A5084555852 @default.
• W772443973 date "2014-01-01" @default.
• W772443973 modified "2023-09-27" @default.
• W772443973 title "Exploring Bioavailability of Hydrophobic Organic Contaminants in Sediments" @default.
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• W772443973 hasPublicationYear "2014" @default.
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