Exploring the effects of pulsed ultrasound at 205 and 616Â kHz on the sonochemical degradation of octylbenzene sulfonate

► Pulsing ultrasound affects rate of degradation of OBS. ► Pulsing of ultrasound also affects rate of HTA formation but not necessarily in the same way as with OBS degradation. ► Comparative method yields insight on how surfactants affect cavitation under different conditions. ► Over long sonication times, first-order degradation was maintained with pulsed ultrasound.