The CMC values were determined by plotting the surface tension versus the surfactant solution for various concentrations (Fig. 1). The CMC values for Brij 30, Tween 80, and Triton X-100 were 3.50×10−5 M (9.7 mg/l), 2.50×10−5 M (13.4 mg/l), and 1.85×10−4 M (13.6 mg/l), respectively.