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Prediction of Polycyclic Aromatic Hydrocarbon Bioaccessibility to Earthworms in Spiked Soils by Composite Extraction with Hydroxypropyl-β-Cyclodextrin and Organic Acids

查看全文 作　　者：ZHANG [1,2]Yanan;YANG [1]Xinglun;GU [1]Chenggang;BIAN [1]Yongrong;LIU [1]Zongtang;JIA [1]Mingyun;WANG [1]Fang;WANG [3]Daizhang;JIANG [1]Xin 高影响力作者 机构地区：[1]Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences;[2]University of Chinese Academy of Sciences;[3]College of Resources and Environment, Henan Agricultural University高影响力机构 出　　处：《Pedosphere》索引2017年第27卷第3期,共9页高影响力期刊 基　　金：supported by the National Key Basic Research Development Program (973) (No. 2014CB441105);the National Natural Science Foundation of China (Nos. 41271327, 41271464 and 21377138) 摘　　要：Traditional exhaustive extraction methods often overestimate the risk of polycyclic aromatic hydrocarbon(PAH) bioaccessibility to biota. Therefore, reliable assessment methods need to be established. In this study, a composite extraction with hydroxypropyl-β-cyclodextrin(HPCD) and three low-molecular-weight organic acids, oxalic acid(OA), malic acid(MA), and citric acid(CA), was used to predict the PAH bioaccessibility to earthworms, subjecting to two soils(red soil and yellow soil) spiked with selected PAHs,phenanthrene, pyrene, chrysene, benzo(a)anthracene, benzo(b)fluoranthene, benzo(k)fluoranthene, and benzo(a)pyrene. For both soils,concentrations of PAHs by composite extraction using HPCD-OA(R^2= 0.89–0.92, slope = 1.89–2.03; n = 35), HPCD-MA(R^2=0.92–0.96, slope = 1.43–1.67; n = 35), and HPCD-CA(R^2= 0.92–0.96, slope = 1.26–1.56; n = 35) were significantly correlated with PAH accumulation in the Eisenia fetida earthworms. Moreover, the HPCD-CA-and HPCD-MA-extracted PAH concentrations were closer to the earthworm-accumulated PAH concentration than the extraction using just HPCD. The results indicated that the composite extraction could improve the prediction of PAH bioaccessibility, and therefore can serve as a reliable chemical method to predict PAH bioaccessibility to earthworms in contaminated soils. 关 键 词：羟丙基-Β-环糊精 低分子量有机酸 生物有效性 污染土壤 多环芳烃 蚯蚓 复合 预测
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