Soil, Water and Environmental Science Department, School of Earth and Environmental Sciences, University of Arizona, 429 Shantz Bldg., Tucson, AZ 85721, USA; Hydrology and Water Resources Department, School of Earth and Environmental Sciences, University of Arizona, 429 Shantz Bldg., Tucson, AZ 85721, USA.
Soil, Water and Environmental Science Department, School of Earth and Environmental Sciences, University of Arizona, 429 Shantz Bldg., Tucson, AZ 85721, USA.
Chemosphere. 2015 May;127:208-13. doi: 10.1016/j.chemosphere.2015.01.029. Epub 2015 Feb 27.
Interfacial partitioning tracer tests (IPTT) are used to measure air-water interfacial area for unsaturated porous media. The standard IPTT method involves conducting tests wherein an aqueous surfactant solution is introduced into a packed column under unsaturated flow conditions. Surfactant-induced drainage has been observed to occur for this method in some cases, which can complicate data analysis and impart uncertainty to the measured values. Two novel alternative approaches for conducting IPTTs are presented herein that are designed in part to prevent surfactant-induced drainage. The two methods are termed the dual-surfactant IPTT (IPTT-DS) and the residual-air IPTT (IPTT-RA). The two methods were used to measure air-water interfacial areas for two natural porous media. System monitoring during the tests revealed no measurable surfactant-induced drainage. The measured interfacial areas compared well to those obtained with the standard IPTT method conducted in such a manner that surfactant-induced drainage was prevented.
界面分区示踪剂测试（IPTT）用于测量非饱和多孔介质的气-液界面面积。标准的 IPTT 方法涉及进行测试，其中在非饱和流动条件下将水基表面活性剂溶液引入填充柱。在某些情况下，已经观察到这种方法会发生表面活性剂诱导的排水，这可能会使数据分析复杂化，并对测量值产生不确定性。本文提出了两种用于进行 IPTT 的新的替代方法，这些方法部分旨在防止表面活性剂诱导的排水。这两种方法分别称为双表面活性剂 IPTT（IPTT-DS）和残余空气 IPTT（IPTT-RA）。这两种方法用于测量两种天然多孔介质的气-液界面面积。测试过程中的系统监测显示没有可测量的表面活性剂诱导排水。测量得到的界面面积与以防止表面活性剂诱导排水的方式进行的标准 IPTT 方法得到的结果非常吻合。
