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The use of sequential supercritical fluid extraction for bioavailabilityinvestigations of PAH in soil

机译：使用顺序超临界流体提取对土壤中PAH的生物利用性屈服

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The influence of soil organic matter (SOM) content on the bioavailability of polycyclic aromatic hydrocarbons (PAH) was investigated by performing biodegradation experiments and comparing these data to results from a sequential supercritical fluid extraction (SSFE) method. Two model soils with different SOM (soil 1:2.1%, soil 2:8%) were contaminated using anthracene oil containing fluoranthene as the major high molecular weight PAH. After spiking, soils were stored for 135 days in order to assess the influence of aging on the biodegradation and extractability of fluoranthene. Moreover, experiments were also performed on an industrial soil, which was already contaminated several decades ago. For non-aged samples, advanced degradation was achieved in soil 2 (higher in SOM). However, for aged samples, degradation was lower in soil 2 indicating that sequestration was more pronounced in the high organic matter soil. To evaluate the retention/release behavior of PAH in soil as an important: factor influencing their bioavailability, a SSFE method was developed comprising eight subsequent extraction steps. For aged spiked soils extraction data indicate a reduced recovery when high in SOM. These findings are in line with the respective microbial degradation results. However, for non-aged samples no difference in extraction recovery could be observed for both, low and high organic matter soils. Finally, for industrially contaminated soil an inverse relationship between the molecular weight of PAH and their extraction recovery was observed.
机译：通过进行生物降解实验并将这些数据与顺序超临界流体萃取（SSFE）方法进行比较来研究土壤有机物质（SOM）含量对多环芳烃（PAH）生物利用度的影响。使用含氟油作为主要高分子量PAH的含蒽油被污染的两种模型土壤（土壤1：2.1％，土壤2：8％）被污染。尖峰后，将土壤储存135天，以评估老化对氟蒽生物降解和萃取性的影响。此外，还在工业土壤上进行了实验，该工业土壤已经污染了几十年前。对于非老化样品，在土壤2中取得高级降解（SOM中较高）。然而，对于年龄样品，土壤2中的降解较低，表明在高有机物质土壤中螯合更加明显。为了评估土壤中PAH的保留/释放行为作为重要的：影响其生物利用度的因子，SSFE方法包括八个后续提取步骤。对于老化的尖刺，土壤提取数据表明在SOM中高的恢复降低。这些发现符合各自的微生物降解结果。然而，对于非老化样品，可以针对低和高有机物质土壤观察到提取恢复的差异。最后，对于工业污染的土壤，观察到PAH的分子量与其提取恢复之间的反比关系。

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