Table 5: Effects of NaCl concentrations on the foam abilities of different surfactants at room temperature.

NaCl concentration (mg·L-1)The initial foam volume (mL)The half-life time (s)
CTAACCTABUCTAHECTACACTAACCTABUCTAHECTACA

0420412400385315291281242
4000428425416391325295288249
8000440432422405330297277253
10000405392372360280267245209
40000382379360338260243221195
50000355350332285245299205179