マイクロ波を用いる土壌及び底質中ダイオキシン類の迅速抽出法(2)

概要

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Rapid extraction for polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and dioxin like-PCBs (DL-PCBs) in soils and sediments was developed by microwave-assisted extraction (MAE). Six grams of samples were extracted with mixed solvents composed of 6mL of toluene, 2.4mL of water, and 4.8mL of ethanol at a temperature of 125℃ for 30min. After purification and concentration, the samples were measured by a high-resolution gas chromatograph interfaced to a high-resolution mass spectrometric detector. The concentrations of PCDD/DFs and DL-PCBs were equivalent to results obtained by the conventional method using Soxhlet extraction (SE). The extraction efficiencies (MAE/SE×100) were in the range of 81〜116% and the reproducibility of MAE was below 19% for all samples. Furthermore, it was found that our extraction method could be applied to wet samples. This indicates that the analysis time of dioxins can be reduced, because it is possible to omit an air drying step.
2009-01-05