| 化学提取法表征污染土壤中PAHs老化规律和蚯蚓富集特征 |
| 摘要点击 2306 全文点击 1624 投稿时间：2015-06-23 修订日期：2015-07-20 |
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| 中文关键词 多环芳烃 生物有效性 老化规律 蚯蚓富集 化学提取法 |
| 英文关键词 PAHs bioavailability aging law earthworm bioaccumulation chemical extraction |
| 作者 | 单位 | E-mail | | 张亚楠 | 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008
中国科学院大学, 北京 100049 | yanan@issas.ac.cn | | 杨兴伦 | 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008 | | | 卞永荣 | 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008 | | | 谷成刚 | 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008 | | | 刘总堂 | 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008
中国科学院大学, 北京 100049 | | | 李娇 | 河南农业大学资源与环境学院, 郑州 450002 | | | 王代长 | 河南农业大学资源与环境学院, 郑州 450002 | | | 蒋新 | 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008
中国科学院大学, 北京 100049 | jiangxin@issas.ac.cn |
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| 中文摘要 |
| 以添加3种典型多环芳烃(菲、芘、苯并［a］芘)的模拟污染土壤(黄壤和红壤)为对象,研究了PAHs的4种化学提取量即:ASE耗竭性提取总量、Tenax-TA树脂提取量、羟丙基-β-环糊精(HPCD)提取量和正丁醇提取量随老化时间的变化规律. 结果表明,在0~60 d老化时间范围内,PAHs耗竭性提取总量在前30 d随时间的延长而降低,后30 d降低趋势不明显,含量基本稳定; PAHs的Tenax、HPCD、正丁醇提取量在0~60 d老化时间范围内,随老化时间的延长而持续降低. 实验进一步研究了PAHs的蚯蚓蓄积量(赤子爱胜蚓Eisenia fetida)与4种化学法提取量的相关关系. 结果显示,ASE耗竭性提取总量高估了土壤中PAHs的存在风险,并且与蚯蚓富集量没有显著的相关性(R2为0.44~0.56),因此不能用耗竭性提取总量来评估污染土壤PAHs的生物有效性; 而3种非耗竭性提取量与蚯蚓富集量呈现出较好的线性关系,其中HPCD提取法(R2为0.94~0.99)较Tenax提取(R2为0.62~0.87)和正丁醇提取(R2为0.69~0.94)更优. 表明可以将HPCD提取法作为预测污染土壤中PAHs生物有效性的一种较为理想的方法. |
| 英文摘要 |
| To evaluate the effect of aging on the availability of PAHs, chemical extraction by exhaustive (ASE extraction) and nonexhaustive techniques (Tenax-TA extraction, hydroxypropyl-β-cyclodextrin (HPCD) extraction, n-butyl alcohol (BuOH) extraction) as well as PAHs accumulation in earthworms (Eisenia fetida) were conducted in yellow soil from Baguazhou, Nanjing, China, and red soil from Hainan, China, spiked with phenanthrene, pryene and benzo(a)pyrene and aged 0, 7, 15, 30 and 60 days. The results showed that the concentration of PAHs extracted by ASE and three nonexhaustive techniques and accumulated by earthworms significantly decreased with aging time, except the ASE extracted concentration between 30-and 60-day aging time. Furthermore, the relationships were studied in this experiment between chemical extracted PAHs concentration and accumulated concentration in earthworms. PAHs accumulated concentration in earthworms was not significantly correlated with the exhaustive extracted concentration of PAHs in soil (R2 0.44-0.56), which indicated that ASE extraction techniques could not predict PAHs bioavailability to earthworms because it overestimated the risk of PAHs. However, the PAHs accumulated concentration in earthworms was significantly correlated with the three nonexhaustive extracted concentrations of PAHs in soil, which indicated that all the three nonexhaustive techniques could predict PAHs bioavailability to earthworm to some extent, among which, HPCD extraction (R2 0.94-0.99) was better than Tenax-TA extraction (R2 0.62-0.87) and BuOH extraction (R2 0.69-0.94). So HPCD extraction was a more appropriate and reliable technique to predict bioavailability of PAHs in soil. |
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