Interfacial partitioning tracer test measurements of organic-liquid/water interfacial areas: application to soils and the influence of surface roughness.
Interfacial partitioning tracer test measurements of organic-liquid/water interfacial areas: application to soils and the influence of surface roughness.
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DOI：
10.1021/es101312n
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发表时间：
2010-10-01
影响因子：
11.4
通讯作者：
Janousek, Hilary
中科院分区：
文献类型：
--
作者：
Brusseau, Mark L.;Narter, Matt;Janousek, Hilary
采用水相界面分配示踪试验方法，测定了两种天然土壤中有机不混溶液体与水的界面面积。将测量值与从文献中编译的硅砂的测量值进行比较。使用最大比界面面积作为系统指数，这是有用的情况下，其中流体饱和度不同的数据进行了比较。土壤测得的最大比界面面积显着大于获得的砂的值。值之间的差异归因于表面粗糙度对固体表面积的影响，因此与膜相关的界面面积。用N2/BET法测得的最大比界面面积和比固体表面积之间具有良好的相关性。相关性可以作为一种手段，通过它来估计最大比有机-液体/水界面面积。用界面分配示踪法测量的界面面积进行了比较，用高分辨率显微断层扫描测量的界面面积。用前一种方法测得的值始终大于用后者测得的值，这与显微断层扫描法表征粗糙度相关表面积的一般无能相一致。
Interfacial areas between an organic immiscible liquid and water were measured for two natural soils using the aqueous-phase interfacial partitioning tracer test method. The measured values were compared to measured values for silica sands compiled from the literature. The data were compared using the maximum specific interfacial area as a system index, which is useful for cases wherein fluid saturations differ. The maximum specific interfacial areas measured for the soils were significantly larger than the values obtained for the sands. The disparity between the values was attributed to the impact of surface roughness on solid surface area and hence film-associated interfacial area. A good correlation was observed between maximum specific interfacial area and specific solid surface area measured with the N2/BET method. The correlation may serve as a means by which to estimate maximum specific organic-liquid/water interfacial areas. Interfacial areas measured with the interfacial partitioning tracer method were compared to interfacial areas measured with high-resolution microtomography. Values measured with the former method were consistently larger than those measured with the latter, consistent with the general inability of the microtomography method to characterize roughness-associated surface area.
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