John Wiley & Sons, Ltd.

PAHs, nitro‐PAHs, hopanes and steranes in lake trout from the Lake Michigan

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This study examines concentrations and risks of polycyclic aromatic hydrocarbons (PAHs), nitro‐PAHs (NPAHs), steranes and hopanes in lake trout collected in Lake Michigan. A total of 74 fish were collected in two seasons at three offshore sites. Σ9PAH concentrations in whole fish ranged from 223 to 1,704 pg/g wet weight (ww), and PAH concentrations and profiles were similar across season, site and gender. Σ9NPAH concentrations ranged from 0.2 to 31 pg/g ww, and carcinogenic compounds, including 1‐nitropyrene and 6‐nitrochrysene, were detected. In fall, NPAH concentrations were low at the Illinois site (0.2–0.5 pg/g ww), and site profiles differed considerably; in spring, concentrations and profiles were similar across sites, possibly reflecting changes in fish behavior. In fall, Σ5Sterane and Σ2Hopane levels reached 808 and 141 pg/g ww, respectively, but concentrations in spring were ten times lower. Concentrations in eggs (fall only) were in the same order of magnitude as those in whole fish. These results demonstrate the presence of target SVOCs in a top predator fish, and are consistent with PAH “biodilution” observed previously. Using the available toxicity information for PAHs and NPAHs, the expected cancer risk from consumption of lake trout sampled are low. However, it is notable that NPAHs contributed a significant portion of the TEQs in some samples. This study provides the first measurements of NPAHs in freshwater fish, and results suggest that additional assessment is warranted. Environ Toxicol Chem © 2014 SETAC

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