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| Effects of biochar on the total and bioavailable polycyclic aromatic hydrocarbons(PAHs) in soil |
| Received:August 31, 2016 |
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| KeyWord:biochar;polycyclic aromatic hydrocarbons;corn stover;volatilization;bioavailability |
| Author Name | Affiliation | E-mail | | ZHANG Yuan-yuan | College of Environmental Science and Resources, Shanxi University, Taiyuan 030006, China | | | WANG Cong-ying | College of Environmental Science and Resources, Shanxi University, Taiyuan 030006, China | lizengbo@sina.com | | LI Zeng-bo | School of Chemical and Biological Engineering, Taiyuan University of Science and Technology, Taiyuan 030002, China | | | SHI Zhi-ming | College of Environmental Science and Resources, Shanxi University, Taiyuan 030006, China | |
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| Abstract: |
| In the present study, a 24 weeks' soil incubation experiment was carried out to investigate the effect of corn stover biochar on the total and bioavailable phenanthrene and pyrene in soil. The biochar was applied at a rate of 0.1%~2.0%(weight percent). The total concentration of PAHs was extracted by chemical solvent, while the bioavailable of PAHs was measured by polyoxymethylene. In addition, the volatile content of phenanthrene and pyrene during this period was also determined. At the end of the incubation, the total concentration of phenanthrene and pyrene in the amended treatments decreased by 15.6%~25.0% and 12.8%~30.3%, respectively,when compared to the control(without biochar addition). The bioavailable concentration of phenanthrene and pyrene decreased 14.7%~37.3% and 23.4%~49.8%, respectively. With the respect of the volatile PAHs, an obvious inhibition was observed in the first six weeks' incubation, with an amount ranged from 70.4% to 72.4% for phenanthrene, and 36.2% to 48.9% for pyrene, respectively. However, at the end of the incubation, no significant differences(P>0.05) were observed for the inhibition rate between phenanthrene and pyrene, regardless of the biochar application rate. Therefore, biochar has a dose-effect on reducing both total and bioavailable PAHs in soil, i.e., the total and bioavailable PAHs in soil could be decreased by increasing the biochar application. However, the dose-effect on the inhibition of PAHs volatilization highly depended on the species of PAHs. The results obtained in the present study were very valuable in the remediation of soils contaminated with volatilized organic compounds. |
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