土壤和沉积物中非水解有机碳对菲的吸附

采用改进的酸水解方法对土壤和沉积物中的有机质组分进行了分离和提取,用固体13C核磁共振（13CNMR）表征了非水解有机碳（NHC）,同时研究了不同有机质组分对菲的吸附行为,结果表明,菲的吸附等温线都呈现出明显的非线性,能很好地拟合Freundlich方程;而且NHC和碳黑（BC）比其原始和去矿样品的吸附容量都有明显提高.这些结果揭示了NHC和BC主要控制着菲在土壤和沉积物中的吸附行为.沉积物及其NHC对菲的吸附容量要高于土壤及其NHC,这与土壤和沉积物中有机质的不同来源有关.

PHENANTHRENE SORPTION TO NONHYDROLYZABLE ORGANIC CARBONS(NHC) ISOLATED FROM SOILS AND SEDIMENTS

Three contaminated soils and six sediments were collected from the industrialized suburban areas of Guangzhou and the Pearl river estuary, South China, respectively. The nonhydrolyzable organic carbon(NHC)and black carbon(BC)in the samples were characterized by elemental analysis,and 13C nuclear magnetic resonance spectroscopy(13C-NMR). The 13C-NMR spectrum for the isolated NHC consisted mainly of aliphatic and aromatic carbon. All the sorption isotherms for phenanthrene were nonlinear and were well fitted to the Freundlich model. The single-point organic carbon-normalized distribution coefficients(Koc)for the isolated NHC and BC fraction were significantly higher than those for the bulk samples at the same aqueous concentration of phenanthrene.The NHC fractions including BC played a dominant role to the overall sorption in the bulk samples.The bulk soils and their NHC fractions had lower sorption capacity than the bulk sediments and their NHC fractions, relating to the different source of organic matter between soils and sediments.