Assessment of Availability of Phenanthrene and Pyrene in Aging Soil
The availability of polycyclic aromatic hydrocarbons (PAHs) in aging soils has not been well elucidated. In this study, sequential extraction was utilized to evaluate the availability of phenanthrene and pyrene as representative PAHs in four typical zonal Chinese soils with aging period for 16 weeks. The tested PAHs were fractionated into two groups: the extractable fractions and bound residues. The former, including desorbing and non-desorbing fractions, is the available fractions in soil that can be taken up by plants and/or soilinhabiting animals. Both the desorbing and non-desorbing fractions were observed to generally decrease over time, primarily due to microbial biodegradation of the available residues, the desorbing fractions were more readily biodegradable (> 91.4% and>71.2% for phenanthrene and pyrene, respectively) than the non-desorbing fractions. Attenuation of the desorbing fraction accounted for more than 92.1% and 76.8% of the observed reduction of the available residues of phenanthrene and pyrene, respectively. The observed concentrations of bound PAH residues were much lower than those of the available residues. In comparison with microbial biodegradation, the transformation of available fractions to bound residues accounted for only a negligible reduction of the available residues of the PAHs tested. These results are useful for risk assessments of PAHs related to human health and environmental contamination.
Polycyclic aromatic hydrocarbons (PAHs) Mild-eztraction Availability Aging Soil Bound residue Form Fractionation
Wanting Ling Yuechun Zeng Yanzheng Gao Xuezhu Zhu
College of Resource and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China
国际会议
杭州
英文
193-195
2009-10-10（万方平台首次上网日期，不代表论文的发表时间）