The solubilizations of dense nonaqueous phase liquids trichloroethylene (TCE), carbon tetrachloride (CCl4), 1,2-dichioroethane (DCE) and tetrachloroethene (PCE) in microemulsions containing mixed surfactants 1-dodecyl-3-methylimidazolium bromide (C(12)mimBr) and sodium lauryl sulfate (SLS), were studied by application of the epsilon-beta fishlike phase diagram approach. It was found that the three-phase microemulsions would form at two X-C12mimBr ranges of 0.0-0.1 and 0.8-1.0. Compared to the micro emulsions containing single surfactant C(12)mimBr or SLS, the mixed C(12)mimBr-SLS microemulsions have lower solubility of the alcohol (epsilon(B)) and lower mass fraction of the alcohol in the interfacial layer (A(S)), but higher solubilization parameter (SP*) values. The order of magnitude for the solubilization ability of the chlorohydrocarbons in the C(12)mimBr-SLS mixed (X-C12mimBr = 0.8) microemulsion systems is: TCE > CCl4> PCE > DCE. This is consistent with the results of the literature. As the mass fraction values of oil in oil-water mixture (alpha) increase, epsilon(B) and A(S) decrease, while SP* increases. The effects of both NaCl contents (w) and temperatures (T) on the physicochemical parameters of the microemulsions were also investigated. As the NaCl contents and the temperatures increase, the solubilization ability of the microemulsions increases. (C) 2015 Elsevier B.V. All rights reserved.