Abstract
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 crude-humin-bound PAHs among extractable and non-extractable 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.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Reference
Mackova M, Dowling DN, Macek T (2006) Phytoremediation and Rhizoremediation. Springer, Dordrecht
Nisbet C, LaGoy P (1992) Toxic equivalency factors (TEFs) for polycyclic aromatic hydrocarbons (PAHs). Regul. Toxicol. Pharm. 16: 290–300
Northcott G, Jones K (2001) Partitioning, extractabiity, and formation of nonextractable PAH residues in soils. 1. Compound differences in aging and sequestration. Environ. Sci. Technol. 35: 1103–1110
Oleszczuk P (2009) Application of three methods used for the evalution of polycyclic aromatic hydrocarbons (PAHs) bioaccessibility for sewage sludge composting. Bioresource Technol. 100: 413–420
Author information
Authors and Affiliations
Corresponding authors
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2010 Zhejiang University Press, Hangzhou and Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Ma, B., Chen, H., He, Y., Xu, J. (2010). The Contribution of Rhizosphere to Remediation of Polycyclic Aromatic Hydrocarbons (PAHs) and Their Toxicity in Soil: Evaluating with Sequential Extraction and Toxicity Risk. In: Xu, J., Huang, P.M. (eds) Molecular Environmental Soil Science at the Interfaces in the Earth’s Critical Zone. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-05297-2_61
Download citation
DOI: https://doi.org/10.1007/978-3-642-05297-2_61
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-05296-5
Online ISBN: 978-3-642-05297-2
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)