Food Web Accumulation of Cyclic Siloxanes in Lake Mj酶sa, Norway

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• 作者：Katrine Borg氓 ; Eirik Fjeld ; Amelie Kierkegaard ; Michael S. McLachlan
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：June 5, 2012
• 年：2012
• 卷：46
• 期：11
• 页码：6347-6354
• 全文大小：329K
• 年卷期：v.46,no.11(June 5, 2012)
• ISSN：1520-5851

文摘

The biomagnification of the cyclic volatile methyl siloxanes octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5) and dodecamethylcyclohexatetrasiloxane (D6) was analyzed in the Lake Mj酶sa food web in Norway from zooplankton and Mysis to planktivorous and piscivorous fish. The trophic magnification factor (TMF) for D5 was determined and compared with TMFs of several legacy contaminants: polychlorinated biphenyl (PCB) congeners 153 and 180, polybrominated diphenyl ether (PBDE) congeners 47 and 99, and p,p鈥?DDE. D5 showed TMF significantly greater than 1, implying food web biomagnification (TMF = 2.28, CI: 1.22鈥?.29). This contrasts with two studies that reported TMF < 1, which may reflect variability in TMF between food webs. The Lake Mj酶sa D5 TMF was sensitive to the species included at the higher trophic level; whole food web TMF differed from TMF excluding smelt (Osmerus eperlanus) or brown trout (Salmo trutta) (TMF<sub>鈥揝MELTsub> = 1.62, CI: 0.96鈥?.72; TMF<sub>鈥揟ROUTsub> = 3.58, CI: 1.82鈥?.03). For legacy contaminants (e.g., PCB-153 and PCB-180), the TMFs were less sensitive to the food web composition, and a better model fit was obtained compared to D5. The differences in biomagnification behavior between D5 and the legacy contaminants suggest that the biomagnification of D5 is being governed by species-specific properties such as biotransformation rate or tissue distribution that differ from those of legacy contaminants.