Abstract: Spectrum analysis method was used to study the currents of chronoamperometry of Fe(CN)₆^3-/Fe(CN)₆^4- at Pt microdisk electrode under ultrasound. Through the DFTcan transform the complicate Time spectrum to simple frequency spectrum in some special frequencies, which have specific amplitudes relatived to different mass transfer process of ultrasound. This method can be used to analyse the effect of ultrasound under different conditions, and gives a quantification result. The decay rule of effect of ultrasound with the distance between sono-horn and surface of electrode was also studied.

Key words: Power ultrasound, Spectrum analysis, Mass transfer process