The applicability of the new one-parameter adsorption equation was examined.
This equation was examined with surfactants following Langmuir/Frumkin isotherms.
The effect of Γ∞, a, and K on this adsorption equation was studied theoretically.
This adsorption equation works only for surfactants following K = 0.12(Γ∞ × 1010) − 2.6.