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| The tenax extraction technique to predict the bioavailability of aged PAHs in soil |
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Abstract Tenax-TA was used to extract polycyclic aromatic hydrocarbons from 9 aged agricultural soils and to assess the PAHs bioavailability to earthworm (Eisenia Fetida). The results showed that the high molecular weight PAHs (≥ 4 rings) contributed the largest proportion to the contaminants in the long-term aged agricultural soils. Moreover, the light molecular weight PAHs could be susceptible to be accumulated in the earthworm, while the high molecular weight PAHs were hard to be accumulated. In the present study, PAHs desorption from the agricultural soils was investigated by Tenax extraction. The results of the Tenax consecutive extraction (400 h) indicated that the rate constants were in the order of 10-1~10-2, 10-2~10-3 and 10-4~10-6 and the corresponding fractions were 0.02~0.27, 0.01~0.33 and 0.40~0.95 for the rapid, slow and very-slow desorption, respectively. The fraction of PAHs extracted by Tenax for 6h correlated well with the amount accumulated in earthworms, indicating that Tenax 6 h-extracted fraction could serve as a good predictor of PAHs bioavailability to earthworm.
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Received: 05 September 2010
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ZHANG Li, ZHANG Yuan, QI Shi-Hua, LI Hui, XING Xin-Li, ZHANG Ze-Zhou, ZHENG Huang, SUN Yan, MIN Yang. Characteristics of atmospheric PM2.5 and the variation of PAHs in PM2.5 during spring in Hongshan district, Wuhan[J]. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(8): 2319-2325. |
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