PARTITION EQUILIBRIA OF NON-IONIC ORGANIC-COMPOUNDS BETWEEN SOIL ORGANIC-MATTER AND WATER
PARTITION EQUILIBRIA OF NON-IONIC ORGANIC-COMPOUNDS BETWEEN SOIL ORGANIC-MATTER AND WATER
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DOI：
10.1021/es00110a009
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发表时间：
1983-01-01
影响因子：
11.4
通讯作者：
SCHMEDDING, DW
中科院分区：
文献类型：
--
作者：
CHIOU, CT;PORTER, PE;SCHMEDDING, DW
从土壤上的水二元nonionicorganic化合物的同时吸收的平衡等温线表明两种溶质之间没有竞争效应。这一观察结果支持了这样的假设，即分配到土壤有机相的非离子有机化合物从水中吸附在土壤上的主要过程。采用溶质在水中的传统溶液概念和溶质在聚合腐殖相的Flory-Huggins处理方法，分析了土壤有机质与水的分配过程。12种芳香化合物在Woodburn土壤上的吸附测定结果表明，溶质在水中的不溶度（S）是影响土壤有机质-水分配系数（Kom）的主要因素，溶质与土壤有机质的不相容性是次要的。这解释了通常观察到的log Kom与log S以及log Kom与log Kow（辛醇-水）之间的相关性。
Equilibrium isotherms for the simultaneous uptake of binary nonionicorganic compounds from water on soil indicated no competitive effect between the two solutes. This observation supports the hypothesis that partition to the soil organic phase is the primary process for sorption of nonionic organic compounds from water on soil. The partition process between soil organic matter and water was analyzed by using the conventional solution concept for solutes in water and the Flory-Huggins treatment for solutes in the polymeric humic phase. Sorption determined for 12 aromatic compounds on a Woodburn soil shows that the extent of solute insolubility in water (S) is the primary factor affecting the soil organic matterwater partition coefficient (Kom) and that the effect of solute incompatibility with soil organic matter is significant but secondary. This explains the commonly observed correlations of log Kom vs. log S and log Kom vs. log Kow (octanol-water).