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

机译：超临界流体萃取法和索氏萃取法测定海藻样品中多氯联苯的比较

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The efficiency of supercritical fluid extraction for the determination of 12 polychlorinated biphenyls from algae samples is compared to Soxhlet extraction. Analytical detection limits for the individual congeners ranged from 0.62 μg l~(-1) to 19 μg l~(-1). Recovery was tested for both methods using standard addition procedure. At maximum spike level of concentration, the mean recoveries were not significantly different (P > 0.05) of all PCBs studied, with the exception of PCBs 28, 52, 77 and 169. Method precision for Soxhlet extraction (≤ 3.9%) was slightly better than for SFE (≤ 9.2%). Although both methods yield comparable results, SFE offers the advantage of detecting all PCBs studied at lower concentrations, reducing extraction time, and reducing the amount of solvents needed. 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.
机译：将超临界流体萃取法从藻类样品中测定12种多氯联苯的效率与索氏萃取法进行了比较。单个同类物的分析检出限为0.62μgl〜（-1）至19μgl〜（-1）。使用标准添加程序测试了两种方法的回收率。在最高浓度浓度下，除PCB 28、52、77和169外，所有研究的PCB的平均回收率均无显着差异（P> 0.05）。索氏提取的方法精密度（≤3.9％）稍好比SFE（≤9.2％）。尽管两种方法都能获得可比的结果，但SFE的优势在于可以检测所有浓度较低的PCB，减少萃取时间，并减少所需的溶剂量。优化的方法用于分析三个真实的海藻样品，除了PCB101以外，所有PCB的浓度均低或低于检测极限。样品1中的PCB101含量为6.6±0.54 ng g·（-1）d.w.，样品2中含量为8.2±0.86 ng g·（-1）d.w.。在样品3中为7.7±0.08 ng g（（-1）d.w.

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