Abstract
Abstract The effect of coexistence of linear alkylbenzenesulfonates (LAS) on the migration behavior of trichloroethylene (TCE) was measured by porous column. It was observed that the migration of TCE occurs by different mechanisms at different LAS concentrations. When LAS was higher than its critical micelle concentration (CMC), TCE eluted by micellar solubilization. When LAS was lower than its CMC, TCE eluted as small droplets through a column which was packed with 0.8mm diameter of glass beads although it eluted only water saturation solubility when the column was packed with 140 mesh glass powder. From the observations, the effects of coexisting LAS on the migration of TCE were concluded to be: (i) solubilization of TCE into its micelle, and (ii) decrease of surface tension and granulation of TCE with emulsification. The former effect only occurred when the LAS concentration was higher than its CMC while the latter effect occurred even in the LAS concentration below its CMC.
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