Table 5. Measurement of Oil–Seawater Interfacial Tension with the Addition of ILs and Surfactants^a.

		IFT (mN/m)
sample	system	25 °C	100 °C
1	seawater (SW)	23.34	20.15
2	10 ppm [C12mim]+[Cl]– + SW	18.5	15.89
3	50 ppm [C12mim]+[Cl]– + SW	16.3	14.36
4	100 ppm [C12mim]+[Cl]– + SW	15.3	13.18
5	250 ppm [C12mim]+[Cl]– + SW	13.8	10.95
6	500 ppm [C12mim]+[Cl]– + SW	11.3	9.78
7	500 ppm [C8mim]+[Cl]– + SW	11.7	10.02
8	500 ppm [C6mim]+[Cl]– + SW	12.3	10.23
9	500 ppm [C4mim]+[Cl]– + SW	12.8	10.65
10	500 ppm AOS + SW	4.75	4.13
11	500 ppm [C12mim]+[Cl]– + 500 ppm AOS + SW	5.25	4.39

^aThe standard uncertainties are u(IFT) = 0.15 mN/m and u(ILs/AOS conc.) = 2 ppm.