温和溶剂提取预测土壤中多环芳烃的生物有效性 |
摘要点击 3578 全文点击 2380 投稿时间:2010-08-09 修订日期:2010-12-05 |
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中文关键词 多环芳烃 生物有效性 温和溶剂 生物蓄积 正丁醇 羟丙基-β-环糊精 |
英文关键词 PAHs bioavailability mild solvent bioaccumulation n-butanol hydroxypropyl-β-cyclodextrin(HPCD) |
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中文摘要 |
利用正丁醇和羟丙基-β-环糊精(hydroxypropyl-β-cyclodextrin,HPCD)提取来自9个农田土壤中的多环芳烃(polycyclic aromatic hydrocarbons,PAHs),并应用于评价场地多年老化土壤中PAHs对赤子爱胜蚯蚓(Eisenia fetida)的生物有效性.结果表明,对于多年老化场地,土壤中污染物的主要组成为4环以上的中、高环PAHs,其中4环占34.06%,5、 6环占34.09%,而蚯蚓较易蓄积低环PAHs,对高环PAHs蓄积能力较差;温和溶剂提取与蚯蚓体内蓄积的PAHs的相关性研究表明:温和溶剂提取对3环的PAHs具有较好相关性(r2为0.77~0.79),而对其他环的PAHs没有相关性(r2<0.35),因此,对于多年老化污染土壤,温和溶剂提取可能并不是一个理想的生物有效性预测方法. |
英文摘要 |
n-butanol and hydroxypropyl-β-cyclodextrin(HPCD) were used to extract polyclic aromatic hydrocarbons from 9 aged agricultural fields and to assess the PAHs bioavailability to earthworm(Eisenia fetida). It was demonstrated that the high molecular weight(HMW) PAHs (≥4 rings) contribute the largest proportions (4-ring PAHs:34.06%,5-6 rings:34.09%) to the contaminants in long-term aged field soils. Moreover, the light molecular weight PAHs were easily accumulated in the earthworm,while the high molecular weight PAHs were hard to accumulate. The extraction by mild solvent correlated well with the 3 ring PAHs(r2 0.77-0.79) but not for the other rings PAHs (r2<0.35), indicating that mild extraction may not serve as a good predictor of PAHs bioavailability to earthworm. |