Comparison of supercritical fluid extraction and Soxhlet extraction for the determination of PCBs in seaweed samples

The optimized methods were applied to the analysis of three real seaweed samples, except for PCB101 the concentrations of all PCBs were low or below the detection limits. The levels of PCB101 found in sample 1 were 6.6 ± 0.54 ng g−1 d.w., in sample 2 the levels were 8.2 ± 0.86 ng g−1 d.w. and in sample 3 they were 7.7 ± 0.08 ng g−1 d.w.