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首页> 外文期刊>Environmental toxicology and chemistry >DISTINCTIVE SORPTION MECHANISMS OF SOIL ORGANIC MATTER AND MINERAL COMPONENTS AS ELUCIDATED BY ORGANIC VAPOR UPTAKE KINETICS
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DISTINCTIVE SORPTION MECHANISMS OF SOIL ORGANIC MATTER AND MINERAL COMPONENTS AS ELUCIDATED BY ORGANIC VAPOR UPTAKE KINETICS

机译：气相吸收动力学法测定土壤有机质和矿物成分的差异吸附机理

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摘要

Sorption kinetics and capacities of volatile organic compounds (VOCs) affect the remediation and fate of these pollutants in soils. The soil organic-mineral compositional heterogeneity complicates the transport and fate of VOCs in soils. The sorption kinetics of toluene vapor with two common soil components, kaolinite and humic acid, shows two distinct sorption patterns. Results with kaolinite are characteristic of surface adsorption, whereas results with humic acid are characteristic of solvation and partition effects. On soils, the kinetics of toluene vapor sorption show a two-stage sorption phenomenon. The first stage is reflective of surface adsorption (1-4 h to completion) and the second stage of much slower partitioning into soil organic matter, which was preceded by a lag phase (～4 h) and took as long as 15 h for completion. The relative contributions of these two stages to soil uptake are quantifiable by two independent parameters, the soil organic fraction and the surface area. A better understanding of the effect of soil compositional heterogeneity on sorption kinetics and capacities facilitates our understanding of the prediction for the fate of organic contaminants in the environment.
机译：挥发性有机化合物（VOC）的吸附动力学和容量影响土壤中这些污染物的修复和归宿。土壤有机矿物成分的异质性使VOCs在土壤中的运输和结局变得复杂。甲苯蒸气与两种常见的土壤成分（高岭石和腐殖酸）的吸附动力学表现出两种不同的吸附模式。高岭石的结果是表面吸附的特征，而腐殖酸的结果是溶剂化和分配效应的特征。在土壤上，甲苯蒸气吸附的动力学表现出两阶段的吸附现象。第一阶段反映了表面吸附（完成需要1-4小时），第二阶段是缓慢分解为土壤有机质，第二阶段是滞后阶段（约4小时），完成过程需要长达15小时。这两个阶段对土壤吸收的相对贡献可以通过两个独立的参数（土壤有机物含量和表面积）来量化。更好地了解土壤组成异质性对吸附动力学和吸附能力的影响，有助于我们理解对环境中有机污染物命运的预测。

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