Temporal Trends (1981-2013) of Per- and Polyfluoroalkyl Substances and Total Fluorine in Baltic cod (Gadus morhua).

Perfluorooctane sulfonate did not show a significant trend, whereas C12‐C14 PFCA concentrations increased at 19 to 38% between 1972 and 2008 (Kratzer et al. 2011 ).

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Perfluorooctane sulfonate, on the other hand, increased significantly over the entire monitoring period, whereas the trend analysis starting in the same year as PFOS production started to decline (2000) revealed a nonsignificant trend only, possibly indicating the start of declining concentrations.

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