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With petroleum exploration and development expanding in the Arctic (AMAP, 2007) As expected, the bioconcentration factor (BCF) for B[a]P was higher than for phenanthrene in accordance with a higher octanol/water partition coefficient for B[a]P (log K ow = 6.04) compared to phenanthrene (log K ow = 4.53). However, for both compounds, log BCF was lower than log K ow that may indicate active biotransformation and excretion of the selected PAH compounds. These findings on the bio-uptake kinetics for petroleum hydrocarbons are essential for evaluating the potential consequences of an oil spill in the Arctic.