Sorption of nonpolar neutral organic compounds to humic acid-coated sands: contributions of organic and mineral components.
Sorption of nonpolar neutral organic compounds to humic acid-coated sands: contributions of organic and mineral components.
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DOI：
10.1016/j.chemosphere.2007.07.052
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发表时间：
2008
期刊：
影响因子：
8.8
通讯作者：
J. Joo;C. Shackelford;K. Reardon
中科院分区：
文献类型：
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作者：
J. Joo;C. Shackelford;K. Reardon
有机质和矿物表面对六种非极性中性有机物吸附的贡献（1，2，4-三氯苯、1，4-二氯苯、氯苯、间二甲苯、甲苯、苯）通过5种不同有机碳（foc）分数（0.024%~ 0.154%）的腐殖酸（HA）涂层砂的测量数据和四个不同的吸附模型的基础上进行了评估。所有六个山梨酸盐的吸附未涂层和加热的沙子几乎是线性的，由于亲水性矿物表面的覆盖与有序的邻位水区域。所有六种吸着剂对HA涂覆的砂的吸着也基本上是线性的，并且是由对有机物质和矿物表面两者的吸着的组合产生的，其中任一贡献的主导性取决于吸着剂的性质（例如，FOC）和山梨酸酯（例如，Kow）。提出的双组分吸附模型，包括阻塞效应是适当的量化的有机质和矿物表面的整体吸附的贡献。然而，传统的吸附模型，考虑到有机物和矿物表面的贡献提供了基本上作为更复杂的，两个组件的吸附模型，考虑到矿物表面阻挡HA的预测和测量的分配系数之间的良好协议。
The contributions of organic matter and the mineral surface to the overall sorption of six nonpolar neutral organic compounds (1,2,4-trichlorobenzene, 1,4-dichlorobenzene, chlorobenzene, m-xylene, toluene, benzene) by five humic acid (HA)-coated sands with different fractions of organic carbon (foc) ranging from 0.024% to 0.154% were evaluated on the basis of measured data and four different sorption models. Sorption of all six sorbates to both uncoated and heated sands was nearly linear due to the coverage of hydrophilic mineral surface with the ordered vicinal water region. Sorption of all six sorbates to the HA-coated sands was also essentially linear, and resulted from a combination of sorption to both organic matter and the mineral surface, with the dominance of either contribution depending on the properties of the sorbents (e.g., foc) and the sorbates (e.g., Kow). A proposed two-component model for sorption including blocking effect was appropriate for quantifying the contributions of organic matter and the mineral surface to the overall sorption. However, conventional sorption models considering the contributions of both organic matter and the mineral surface provided essentially as good agreement between predicted and measured distribution coefficients as the more complicated, two-component model for sorption that takes into account mineral surface blocking by HA.