The Contribution of Rhizosphere to Remediation of Polycyclic Aromatic Hydrocarbons (PAHs) and Their Tozicity in Soil: Evaluating with Sequential Eztraction and Tozicity Risk
To investigate the effects of rhizosphere process on PAHs bioavailability, a sequential solvent extraction experiment was implemented to identify extractable and non-extractable PAHs in rhizosphere and bulk soils of horsebean. The results showed that the primary fraction was methylene chloride (DCM)extracted and cmde-humin-bound PAHs among extractable and nonextractable fractions, respectively. The proportions of sum toxicity concentrations of DCM-extracted fraction decreased sharply in rhizosphere. The partial least square regression model indicated that the partition tendency of PAHs to plant tissues was similar with that to organic Cenriched humin. The contribution of absorption of plant to PAHs remediation, however, can be neglected comparing with that of soil. In conclusion, rhizosphere poses a vital contribution to PAHs remediation in soil, especially when evaluating with toxicity risk.
Non-eztractable PAHs Rhizoremediation Sequential solvent eztraction Tozicity equivalence factors (TEFs)
Bin Ma Huaihai Chen Yan He Jianming Xu
Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition,College of Environmental and Natural Resource Sciences,Zhejiang University,Hangzhou 310029,China
国际会议
杭州
英文
203-206
2009-10-10（万方平台首次上网日期，不代表论文的发表时间）