Determination of effective air-water interfacial area in partially saturated porous media using surfactant adsorption
Determination of effective air-water interfacial area in partially saturated porous media using surfactant adsorption
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DOI：
10.1029/97wr02227
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发表时间：
1997-12-01
影响因子：
5.4
通讯作者：
Annable, MD
中科院分区：
文献类型：
--
作者：
Kim, H;Rao, PSC;Annable, MD
使用表面反应性示踪剂（十二烷基苯磺酸钠 (SDBS)）和非反应性示踪剂（溴化物）在多个水饱和度 (S-W) 下测量砂填充柱中的有效比空气-水界面面积（(a) 高于 bar(i)）。在稳定水流条件下进行混相驱替实验，以量化 SDBS 由于吸附在砂填充柱中的空气-水界面上而产生的延迟。随着 S-W 的降低，观察到与非反应性示踪剂溴化物相比，SDBS 的延迟增加的一致趋势。使用吉布斯模型解释在不同 SDBS 浓度下测量的空气-水表面张力数据，以估计所需的吸附参数。然后将 SDBS 穿透曲线的延迟因子 (R-t) 与估计的 SDBS 吸附系数结合使用，计算不同 S-W 下的 (a) over bar(i) 值。对于本研究中采用的实验条件范围，SDBS 的延迟因子范围从 S-W = 1.00 时的 R-t = 1.07（由于 SDBS 吸附在沙子上，R-t > 1）到 S-W = 0.29 时的 R-t = 3.44（对应于 (a) 超过 bar(i) = 46 cm(2)/cm(3)）。这些值与理论预测和最近发布的数据一致。还讨论了克服所提出方法的实验限制所需的改进。
The effective specific air-water interfacial area ((a) over bar(i)) in a sand-packed column was measured at several water saturations (S-W) using a surface-reactive tracer (sodium dodecylbenzene sulfonate (SDBS)) and a nonreactive tracer (bromide). Miscible displacement experiments were conducted under steady water flow conditions to quantify the retardation of SDBS resulting from its adsorption onto the air-water interface in a sand-packed column. A consistent trend of increased retardation of SDBS compared with the nonreactive tracer, bromide, was observed with decreasing S-W. The data for air-water surface tension measured at various SDBS concentrations were interpreted using the Gibbs model to estimate the required adsorption parameters. The retardation factors (R-t) for SDBS breakthrough curves were then used in combination with the estimated SDBS adsorption coefficient to calculate the (a) over bar(i) values at different S-W. For the range of experimental conditions employed in this study, the retardation factor for SDBS ranged from R-t = 1.07 at S-W = 1.00 (R-t > 1 due to SDBS sorption on sand) to R-t = 3.44 at S-W = 0.29 (which corresponds to (a) over bar(i) = 46 cm(2)/cm(3)). These values are in agreement with theoretical predictions and recently published data. Improvements needed to overcome the experimental limitations of the presented method are also discussed.