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首页> 外文期刊>Environmental toxicology and chemistry >PREDICTION OF POLYCYCLIC AROMATIC HYDROCARBON BIODEGRADATION IN CONTAMINATED SOILS USING AN AQUEOUS HYDROXYPROPYL-β-CYCLODEXTRIN EXTRACTION TECHNIQUE
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PREDICTION OF POLYCYCLIC AROMATIC HYDROCARBON BIODEGRADATION IN CONTAMINATED SOILS USING AN AQUEOUS HYDROXYPROPYL-β-CYCLODEXTRIN EXTRACTION TECHNIQUE

机译：羟丙基-β-环糊精水溶液萃取技术预测污染土壤中的多环芳烃生物降解

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This study investigated the use of an aqueous hydroxypropyl-β-cyclodextrin (HPCD) shake extraction to predict the degree of microbial degradation of polycyclic aromatic hydrocarbons (PAHs) in soils. Three different aged PAH-contaminated soils were studied: A soil from a former coke works (CW) and two artificially contaminated soils (AC1 and AC2). First, the catabolic activity of the indigenous soil microflora was assessed with ~(14)C-respirometry, using a range of ~(14)C-labeled aromatic compounds. Extensive mineralization of several compounds occurred in the CW and the AC2 soils, suggesting that both soils contained catabolically active microorganisms. No significant mineralization occurred in the AC1 soil, implying that either it did not contain an indigenous PAH-degrading microbial population or that degradation, but not mineralization, occurred. The soils then were subjected to three sets of analyses: dichloromethane (DCM) soxhlet extraction, six-week biodegradation assay followed by DCM extraction, and extraction with HPCD followed by DCM extraction. A general decrease in PAHs present in the soils occurred after the biodegradation assay. In the CW and the AC1 soils, strong correlations were observed between the amount of PAHs biodegraded and the fraction of PAHs removed from the soils using the HPCD extraction. However, the AC2 soil showed a more modest correlation between the biodegradable fraction and the HPCD extractable fraction, with the HPCD extraction slightly underestimating the extent of PAH biodegradation. The results of this study indicated that an aqueous HPCD extraction may be a useful tool in assessing the microbial availability of aged contaminant mixtures in soils, although further validation is required.
机译：这项研究调查了使用羟丙基-β-环糊精（HPCD）摇动提取来预测土壤中多环芳烃（PAHs）的微生物降解程度。研究了三种不同的经PAH污染的老化土壤：一种来自以前的焦炭厂（CW）的土壤和两种人工污染的土壤（AC1和AC2）。首先，使用〜（14）C标记的芳香族化合物，通过〜（14）C-呼吸测定法评估了土著土壤微生物区系的分解代谢活性。在CW和AC2土壤中发生了多种化合物的广泛矿化作用，这表明这两种土壤均含有分解代谢活性微生物。 AC1土壤中未发生明显的矿化作用，这表明它不包含可降解PAH的本地微生物群，或者发生了降解，但未发生矿化作用。然后对土壤进行三组分析：二氯甲烷（DCM）索氏提取，六周生物降解分析，然后进行DCM提取，先用HPCD进行提取，再进行DCM提取。生物降解试验后，土壤中PAHs普遍下降。在CW和AC1土壤中，观察到生物降解的PAHs量与使用HPCD萃取从土壤中去除的PAHs比例之间存在很强的相关性。但是，AC2土壤在可生物降解级分和HPCD可萃取级分之间显示出更为适度的相关性，其中HPCD萃取略微低估了PAH的生物降解程度。这项研究的结果表明，尽管需要进一步的验证，但含水HPCD萃取可能是评估土壤中老化的污染物混合物的微生物利用率的有用工具。

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