Bioaccumulation of Selected Halogenated Organic Flame Retardants in Lake Ontario

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The trophic magnification of polybrominated diphenyl ethers (PBDEs) and selected nonlegacy halogenated organic compounds (HOCs) was determined in the food web of Lake Ontario (ON, Canada). In all, 28 Br-3-Br-8-PBDEs and 24 HOCs (10 of which had not been targeted previously) were analyzed. Average concentrations of sigma 28PBDEs in fish ranged between 79.7 +/- 54.2 ng/g lipid weight in alewife (Alosa pseudoharengus) and 815 +/- 695 ng/g lipid weight in lake trout (Salvelinus namaycush). For invertebrates, concentrations were between 13.4 ng/g lipid weight (net plankton; >110 mu m) and 41.9 ng/g lipid weight in Diaporeia (Diaporeia hoyi). Detection frequency (DF) for HOCs was highest for anti-Dechlorane Plus (anti-DDC-CO), 1,3-diiodobenzene (1,3-DiiB), tribromo-methoxy-methylbenzene (ME-TBP), allyl 2,4,6-tribromophenyl ether (TBP-AE), pentabromocyclododecene (PBCYD), alpha+beta-tetrabromocylcooctane (TBCO), 2-bromoallyl 2,4,6-tribromophenyl ether (BATE), and pentabromotoluene (PBT; DF for all = 100% in lake trout). Tetrabromoxylene (TBX), dibromopropyl 2,4,6-tribromophenyl ether (TBP-DBPE), and syn-DDC-CO were also frequently detected in trout (DF = 70-78%), whereas 2,3,4,5,6-pentabromoethyl benzene (PBEB) was detected only in plankton. Several HOCs were reported in aquatic biota in the Great Lakes (USA/Canada) for the first time in the present study, including PBCYD, 1,3DiiB, BATE, TBP-DBPE, PBT, alpha + beta-TBCO, and ME-TBP. The Br4-6-BDEs (-47, -85, -99, -100, -153, and -154) all had prey-weighted biomagnification factors (BMFPW) values >6, whereas BMFPW values for Br7-8-BDEs were <1. The highest BMFPW values of non-PBDEs were for TBP-DBPE (10.6 +/- 1.34) and ME-TBP (4.88 +/- 0.60), whereas TBP-AE had a BMFPW value of <1. Significant (p <= 0.05) trophic magnification factors (TMFs), both positive and negative, were found for Br4-8-BDEs (BDE 196 = 0.4; BDE 154 = 9.5) and for bis(2,4,6-tribromophenoxy)ethane (BTBPE; 0.53), PBCYD (1.8), 1,3-DiiB (0.33), and pentabromobenzene (PBB; 0.25). Food chain length was found to have a significant influence on the TMF values. Environ Toxicol Chem 2019;38:1198-1210. (c) 2019 SETAC


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Flame retardants, Lake, Ontario, Lake Ontario, Biota, Biomagnification factor, Trophic magnification factor


Environmental Toxicology And Chemistry

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