Determination of diffusion and adsorption coefficients for volatile organics in an organophilic clay - sand - bentonite liner
Determination of diffusion and adsorption coefficients for volatile organics in an organophilic clay - sand - bentonite liner
复制标题
亲有机粘土-砂-膨润土衬里中挥发性有机物的扩散和吸附系数的测定
DOI：
10.1139/t01-017
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发表时间：
2001
影响因子：
3.6
通讯作者：
Jimin Peng
中科院分区：
文献类型：
--
作者：
J. Headley;B. Boldt;M. Haug;Jimin Peng
在设计石油产品密封屏障时，必须了解污染物的输运条件。采用批式吸附法测定了苯、甲苯和甲苯示踪剂2-氟甲苯在3种土壤上的吸附系数（Kd）。当土水比为0.100.30 g/mL时，渥太华砂的Kd值分别为2.51.2 mL/g（苯）、11.33.6 mL/g（甲苯）和10.93.7 mL/g（2-氟甲苯）。在相似的土水比条件下，苯、甲苯和2-氟甲苯的Kd值分别为40.950.0mL/g、154129 mL/g和157114 mL/g。当土水比在0.01 ~ 0.05范围内时，膨润土的Kd值分别为37.60 ~ 0.14 mL/g（苯）、60.316.5 mL/g（甲苯）和51.233.6 mL/g（2-氟甲苯）。一般而言，对于给定的混合物，甲苯的吸附性是苯的2至5倍，表明疏水性是其吸附的重要因素。扩散系数在…
In the design of barriers for containment of petroleum products it is essential to know the conditions for contaminant transport. In this work, a batch test method was used to determine the adsorption coefficients (Kd) of benzene, toluene, and 2-fluorotoluene (a tracer for toluene) on three soils. For Ottawa sand using soil to water ratios of 0.100.30 g/mL, Kd values were 2.51.2 mL/g (benzene), 11.33.6 mL/g (toluene), and 10.93.7 mL/g (2-fluorotoluene), respectively. Using organophilic clay at similar soil to water ratios, the Kd values were 40.950.0 mL/g (benzene), 154129 mL/g (toluene), and 157114 mL/g (2-fluorotoluene), respectively. Kd values for bentonite were 37.60.14 mL/g (benzene), 60.316.5 mL/g (toluene), and 51.233.6 mL/g (2-fluorotoluene) using soil to water ratios in the range 0.010.05. In general, for a given mixture, toluene was two to five times more adsorptive than benzene, indicating that hydrophobicity was an important factor in their adsorption. The diffusion coefficients in ...