Laura MacManus-Spencer - Bioaccumulation of Perfluorochemicals in Sediments by the Aquatic Oligochaete Lumbriculus variegatus.

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      Publication Details (including relevant citation   information): Higgins, Christopher P., McLeod, Pamela   B., MacManus-Spencer, Laura A., Luthy, Richard G., Environ.   Sci. Technol., 2007, 41 (13), pp   4600-4606

      Abstract: Bioaccumulation of perfluoroalkyl   sulfonates, perfluorocarboxylates, and 2-(N-ethylperfluorooctane   sulfonamido) acetic acid (N-EtFOSAA) from lab.-spiked and   contaminated field sediments was assessed using the freshwater   oligochaete, Lumbriculus variegatus. Semi-static batch expts.   were conducted to monitor the biol. uptake of these   perfluorochems. (PFCs) over 56 days. The elimination of PFCs was   measured as the loss of PFCs in L. Variegatus exposed to   PFC-spiked sediment for 28 days and then transferred to clean   sediment. The resultant data suggest that PFCs in sediments are   readily bioavailable and that bioaccumulation from sediments does   not continually increase with increasing perfluorocarbon chain   length. Perfluorooctane sulfonate (PFOS) and perfluorononanoate   were the most bioaccumulative PFCs, as measured by lab.-based   estd. steady-state biota sediment accumulation factors (BSAFs)   and BSAFs measured using contaminated field sediments.   Elimination rate consts. for perfluoroalkyl sulfonates and   perfluorocaroboxylates were generally smaller than those   previously measured for other org. contaminants. Last, a PFOS   precursor, N-EtFOSAA, accumulated in the worm tissues and   appeared to undergo biotransformation to PFOS and other PFOS   precursors. This suggests that N-EtFOSAA, which has been detected   in sediments and sludge often at levels exceeding PFOS, may   contribute to the bioaccumulation of PFOS in aquatic organisms.   [on SciFinder(R)]

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