Facilitating effects of metal cations on phenanthrene sorption in soils

文献类型： 外文期刊

第一作者： Luo, Lei

作者： Luo, Lei;Zhang, Shuzhen;Huang, Honiglin;Luo, Lei;Ma, Yibing;Christie, Peter

作者机构：

关键词： HYDROPHOBIC ORGANIC-COMPOUNDS;DISTRIBUTED REACTIVITY MODEL;BLACK CARBON CHAR;HUMIC-ACID;ADSORPTIVE PROPERTIES;PORE BLOCKAGE;MATTER;SEDIMENTS;SUBSTANCES;DOMAINS

期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：9.028； 五年影响因子：9.922 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Effects of metal cations (Na+, Ca2+, and Al3+) on phenanthrene sorption were investigated using two soils with contrasting organic carbon (OC) contents. The presence of the polyvalent cations (i.e., Ca2+ or Al3+) at a concentration of 0.01 mol/L significantly increased the capacity and nonlinearity of phenanthrene sorption to soils compared with the monovalent Na+. The effects were governed by the content of soil OC. Rubbery OC (i.e., soft, amorphous OC including dissolved organic carbon (DOC)) tended to become condensed on soil surfaces as evidenced by a decrease in the signals of the H-1 NMR spectra of DOC and an increase in the glass transition temperature (T-g) of the soils when the polyvalent cations were present. Increasing Ca2+ concentration led initially to an effect similar to that of the polyvalent cations in the low cation concentration range, and the effect was gradually attenuated as Ca2+ concentration further increased. These findings lead us to propose that the modifications in the physical configuration and chemical characteristics of OC resulting from the presence of metal cations account for the increase in the capacity and nonlinearity of phenanthrene sorption to the soils, This study points to an important role of metal cations in the sorption and fate of phenanthrene in the soil environment.

分类号： X13

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