The presence of organic immiscible liquids such as chlorinated solvents and fuels continues to be a primary source of risk for many hazardous waste sites. In this study, the standard miscible-displacement interfacial partitioning tracer test (IPTT) method was used for the first time to measure NAPL-water interfacial areas for a range of saturations. Multiple measurements were conducted for a natural quartz sand, with tetrachloroethene as the representative NAPL. The interfacial areas increased with decreasing water saturation. The measurements compared well to interfacial areas measured for the same sand with two alternative tracer methods, the mass-distribution batch method and the two-phase flow method. Measurements obtained with all three tracer-based methods exhibit a relatively large degree of variability. Thus, it is important to employ replication when using these methods. In contrast, interfacial areas measured with x-ray microtomography exhibit very small variability. However, the measured interfacial areas do not capture the contribution of surface-roughness to film-associated interfacial area. Each method has associated advantages and disadvantages, and it is important to be cognizant of them during their application.

有机不混溶液体（例如氯化溶剂和燃料）的存在仍然是许多危险废物场的主要风险来源。在本研究中，首次使用标准混相驱替界面分配示踪剂测试（IPTT）方法来测量一系列饱和度的 NAPL-水界面面积。对以四氯乙烯为代表的 NAPL 的天然石英砂进行了多次测量。界面面积随着含水饱和度的降低而增加。这些测量结果与使用两种替代示踪方法（质量分布批量方法和两相流方法）对相同砂子测量的界面面积进行了很好的比较。使用所有三种基于示踪剂的方法获得的测量结果都表现出相对较大程度的变异性。因此，在使用这些方法时采用复制非常重要。相比之下，用 X 射线显微断层扫描测量的界面面积表现出非常小的变化。然而，测量的界面面积并未捕获表面粗糙度对薄膜相关界面面积的贡献。每种方法都有相关的优点和缺点，在应用过程中认识它们很重要。