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首页> 外文期刊>Environmental Science & Technology: ES&T >Biomagnification of alpha- and gamma-Hexabromocyclododecane Isomers in a Lake Ontario Food Web
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Biomagnification of alpha- and gamma-Hexabromocyclododecane Isomers in a Lake Ontario Food Web

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摘要

The extent of bioaccumulation of hexabromocyclododecane (HBCD) isomers (alpha,beta, and gamma) was determined in the Lake Ontario pelagic food web using liquid chromatography tandem mass spectrometry (LC/MS/MS). Concentrations of the alpha-isomer were consistently higher than that of the gamma-isomer. The beta-isomer was below method detection limits in all samples. Whole body concentrations (ng/g, wet wt) of a- and y-HBCD were highest in the top predator lake trout samples ranging from 0.4 to 3.8 ng/g for the a-isomer and 0.1 to 0.8 ng/g for the gamma-isomer. For the prey fish species, the trends in a- and gamma-HBCD levels were slimy sculpin > smelt > alewife. Mean concentrations of total (sum) HBCD (sum of alpha- and gamma-isomers) in the macrozooplankter Mysis relicta (0.14 ± 0.02 ng/g wet wt) and in the benthic invertebrate Diporeia hoyi (0.16 ± 0.02 ng/g, wet wt) were similar and approximately twice as high as in plankton (0.06 ± 0.02 ng/g, wet wt). A strong positive linear relationship was found between sumHBCD concentrations (wet wt) and trophic level based on (delta~15N suggesting that HBCD biomagnifies in the Lake Ontario food web. The trophic magnification factor (TMF = 6.3) derived from the slope of the sumHBCD - trophic level relationship was slightly higher than TMFs for p,p'-DDE (6.1) and sumPCBs (5.7) found previously. Biomagnification factors (BMF, calculated as the ratio of lipid corrected concentration in predator/lipid corrected concentration in prey) were variable between feeding relationships and ranged from 0.4 to 10.8 for the alpha-isomer and from 0.2 to 10 for gamma-isomers.

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