A study was conducted to investigate (1) physicochemical factors that influence polymer elution from GCLs containing a blend of bentonite and linear (water-soluble) polymer (LPB GCLs) and (2) the mechanism that controls the chemical compatibility of LPB GCLs when polymer elutes. A series of hydraulic conductivity (k), free swell and viscosity tests were performed on a commercial LPB GCL using DI water, varying concentrations of NaCl and CaCl₂. Comparable tests were also performed on a conventional bentonite (CB) GCL containing the same untreated bentonite and the same physical properties as the LPB GCL. The LPB GCL showed improved swelling and hydraulic performance compared to the CB GCL when permeated with salt solutions. Total organic carbon analysis of the effluents showed that polymer eluted from the LPB GCL regardless of the permeant solution. However, the rate at which polymer eluted increased as the concentration and valence of the dominant cation increased. The rate at which polymer eluted also increased with hydraulic gradient. The mass of polymer retained inside the GCL matrix did not correlate with the k of the LPB GCL. Free swell tests coupled with chemical analysis suggest that, the improved chemical compatibility of the LPB GCL was due to the ability of the polymer to scavenge cations from the solution which allows the bentonite to undergo adequate swelling during the initial hydration period. Analogous to water-prehydrated CB GCLs, the dispersed structure of the bentonite fabric and increased adsorbed water molecules attained during initial swelling controls the k of the LPB GCL when polymer elutes.

进行了一项研究，以研究 (1) 影响聚合物从含有膨润土和线性（水溶性）聚合物 (LPB GCL) 混合物的 GCL 中洗脱的物理化学因素和 (2) 控制 LPB GCL 化学相容性的机制洗脱。一系列水力传导率（k)，在商用 LPB GCL 上使用去离子水、不同浓度的 NaCl 和 CaCl 2 进行自由溶胀和粘度测试。还在常规膨润土 (CB) GCL 上进行了类似测试，该 GCL 包含与 LPB GCL 相同的未处理膨润土和相同的物理特性。当用盐溶液渗透时，LPB GCL 与 CB GCL 相比显示出更好的溶胀和水力性能。流出物的总有机碳分析表明，聚合物从 LPB GCL 中洗脱，而与渗透溶液无关。然而，聚合物的洗脱速率随着主要阳离子的浓度和价态的增加而增加。聚合物的洗脱速率也随着水力梯度的增加而增加。保留在 GCL 基质内的聚合物质量与kLPB GCL。结合化学分析的自由溶胀试验表明，LPB GCL 的化学相容性提高是由于聚合物从溶液中清除阳离子的能力，这使得膨润土在最初的水合阶段经历了充分的溶胀。类似于水预水化的 CB GCL，膨润土织物的分散结构和初始溶胀过程中增加的吸附水分子控制了聚合物洗脱时 LPB GCL的k。