The laboratory evaluation indicates: (1) ASP formulation can reduce oil-water interfacial tension (IFT) to/below 10-3 mN/m at very low surfactant concentration (0.05-0.3 wt%) and wide concentration range of alkaline (Na2CO3, 0.8-1.4 wt%). (2) The addition of Na2CO3 instead of NaOH ...