A known concentration of a surrogate standard, benzo[a]pyrene-d12, was added to each
sample to yield a final concentration of 0.2 g/mL. Samples were
vortexed for 30 s and centrifuged for 7 min at 2000 rpm (668
×
g).
Samples were then blown to dryness with N2 and brought backup with a known volume of hexane. A known concentration of
internal standard, fluorene-d10, was added to each sample to
determine extraction efficiency. Samples were run on the GC/MS
under the selected ion mode to quantitate the concentration of
BaP in each sample. BaP was not identified in the acetone-treated
samples. Actual BaP concentrations of the treated flakes were:
10.44
±
0.4, 113.6
±
2.3, and 1012
±
30.7 g BaP/g flake equivalent
to 0.209
±
0.008, 2.27
±
0.046, and 20.25
±
0.614 g BaP/g fish,
respectively. Percent recoveries ranged from 70 to 145%.