The dynamic surface tension (DST) of decanoic acid, Triton X-100, and Brij 58 solutions is studied by the so-called "peaktensiometry" method. The obtained results are interpreted by a theoretical model for diffusion-controlled adsorption. Reasonable values for diffusivities of the studied surfactants are obtained. The applicability of the peaktensiometry method to studies of the DST of submicellar and micellar surfactant solutions is demonstrated.