For the system water acetone-toluene the mass transfer is measured up to a pressure of 200 bar at a constant temperature of 20 degrees C for two different concentrations at quiescent pendant droplets. The measurements are compared to empirical predictions. The influence of a surfactant is investigated. A three-mode magnetic suspension balance is used to measure the transfer. Additionally, a Schlieren optic is applied to visualise the convection. Only in cafe of the transfer direction from the droplet into the continuous phase Marangoni convection is detected. A good agreement of measurement and evaluation is achieved. The surfactant damps the interfacial convection. (C) 2007 Elsevier Ltd. All rights reserved.