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Solubilization of nonaqueous phase liquid hydrocarbons in micellar solutions of dodecyl alcohol ethoxylates.

Results of an experimental investigation of hydrocarbon solubilization in 0.01 M micellar solutions of dodecyl alcohol ethoxylates at 25 o C are presented. The effects of surfactant hydrophile-lipophile balance (HLB) and hydrocarbon molar volume and polarity on the molar solubilization ratios (MSRs) and micelle-water partition coefficients of 11 nonaqueous phase liquid (NAPL) hydrocarbons are examined. The MSRs of the alkanes (n-dodecane, n-decane, n-hexane, and cyclohexane), which sharply decrease and asymptotically approach zero with increasing HLB, are shown to depend on micellar core volume and hydrocarbon molar volume and affinity for the micellar core