Sorption of anthropogenic organic compounds by soil organic matter: a mechanistic consideration
Sorption of anthropogenic organic compounds by soil organic matter: a mechanistic consideration
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DOI：
10.4141/s00-067
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发表时间：
2001-08
影响因子：
1.7
通讯作者：
B. Xing
中科院分区：
文献类型：
--
作者：
B. Xing
通过非极性有机物萘和1，2-二氯苯在土壤中的吸附实验，研究了非极性有机物在土壤有机质中的吸附机理。所有的等温线是非线性的，溶质之间的竞争观察。非线性和竞争性的大小顺序为泥炭胡敏酸<泥炭<泥炭胡敏素。Al饱和的HA（Al-HA）的等温线比未处理的HA和Ca-HA的等温线更加非线性，且仅在Al-HA中发生吸附/解吸滞后。这些结果与分配理论或土壤中存在高表面积含碳物质（HSACM）不一致。但结果是一致的双模式吸附，其中SOM被假定为具有凝聚（刚性）和扩展（灵活）域，和吸附只发生在凝聚域和分区在这两个域。这些非理想的吸附行为需要纳入预测模型，以更准确地描述有机物在土壤和地下环境中的归宿和迁移。
Sorption experiments with apolar organic compounds (naphthalene and 1,2-dichorobenzene) were conducted to evaluate sorption mechanisms in soil organic matter (SOM). All isotherms were nonlinear and competition between solutes was observed. Nonlinearity and competition increased in an order of peat humic acid (HA) < peat < peat humin. Isotherms of Al-saturated HA (Al-HA) were more nonlinear than untreated HA and Ca-HA, and sorption/desorption hysteresis occurred only in Al-HA. These results are not consistent with partitioning theory or the presence of high-surface-area carbonaceous materials (HSACM) in soil. But the results are consistent with dual-mode sorption, where SOM is postulated to have both condensed (rigid) and expanded (flexible) domains, and adsorption takes place only in the condensed domains and partitioning in both domains. These non-ideal sorptive behaviors need to be incorporated into predictive models to more accurately describe the fate and transport of organics in soil and subsurface e...