Rate-limited sorption of hydrophobic organic compounds by soils with well-characterized organic matter
Rate-limited sorption of hydrophobic organic compounds by soils with well-characterized organic matter
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DOI：
10.1021/es970461t
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发表时间：
1998-06-01
影响因子：
11.4
通讯作者：
Brusseau, ML
中科院分区：
文献类型：
--
作者：
Piatt, JJ;Brusseau, ML
本研究的重点是速率限制的多环芳烃，烷基化苯，氯化苯，和氯化烯烃的同系物系列的两种土壤，其中一种土壤中的有机质是由腐殖酸和富里酸占主导地位。腐殖土对溶质的吸附作用强于富里酸土。一阶分子连接性指数（X-1（V）），分子溶质描述符，提供了更好的相关性与平衡吸附系数比辛醇-水分配系数（K-ow），经验溶质描述符。因此，吸附物的形状/结构可能对平衡吸附的整体大小产生次要影响。然而，吸附剂的形状/结构表现出显着的影响吸附动力学。两种土壤的传质系数与X-1（v）的相关性存在明显差异。这种差异主要归因于土壤有机质的形态结构和数量（路径长度）。
This study is focused on the rate-limited sorption of homologous series of polycyclic aromatic hydrocarbons, alkylated benzenes, chlorinated benzenes, and chlorinated alkenes by two soils, one in which the organic matter is dominated by humic acid and the other by fulvic acid. The solutes sorbed more strongly to the humic-dominated soil than the fulvic-dominated soil. The first-order molecular connectivity index(X-1(v)), a molecular solute descriptor, provided slightly better correlations with equilibrium sorption coefficients than did the octanol-water partition coefficient (K-ow), an empirical solute descriptor. Thus, sorbate shape/structure may have a secondary influence on the overall magnitude of equilibrium sorption. However, sorbate shape/structure exhibited a significant influence on sorption kinetics. Distinct differences were observed in the correlations of mass-transfer coefficients to X-1(v) for the two soils. The differences were attributed to both sorbate shape/structure and the quantity (path length) and morphology of soil organic matter.