A Distributed Reactivity Model for Sorption by Soils and Sediments. 11. Slow Concentration-Dependent Sorption Rates
A Distributed Reactivity Model for Sorption by Soils and Sediments. 11. Slow Concentration-Dependent Sorption Rates
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DOI：
10.1021/es970764n
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发表时间：
1998-10
影响因子：
11.4
通讯作者：
Weilin Huang;W. Weber
中科院分区：
文献类型：
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作者：
Weilin Huang;W. Weber
测量了7个EPA参考土壤和沉积物以及6个页岩和干酪根样品对疏水性有机污染物探针的长期时间相分布关系(PDR)。菲探针达到表观吸附平衡所需的时间高度依赖于给定吸附剂的水相-溶质浓度C(T)以及与特定吸附剂相关的土壤有机质(SOM)的类型。与低残留溶液相浓度对应的有机-碳归一化单点时间分配比对于环境保护局土壤和沉积物在几天到90天、页岩和干酪根在90天到≥368天的时间范围内接近其各自的表观平衡值。相反，在残留溶液相浓度大2个数量级时，EPA土壤和沉积物在几个小时内达到表观平衡条件，一年内达到表观平衡条件。
Long-term temporal phase distribution relationships (PDRs) were measured for sorption of a hydrophobic organic contaminant probe by seven EPA reference soils and sediments and six shale and kerogen samples. The times required for attainment of apparent sorption equilibrium by the phenanthrene probe were found to be highly dependent upon the aqueous phase-solute concentration, C(t), for a given sorbent, and the type of soil organic matter (SOM) associated with a particular sorbent. Organic-carbon-normalized single-point temporal distribution ratios corresponding to low residual solution phase concentrations were found to approach their respective apparent equilibrium values after times ranging from several days to 90 days for the EPA soils and sediments and from 90 days to ≥ 368 days for the shales and kerogens. Conversely, at residual solution phase concentrations 2 orders of magnitude larger, apparent equilibrium conditions were attained within a few hours for the EPA soils and sediments and within a yea...