DIFFUSIVITY AND SOLUBILITY MEASUREMENT OF OXYGEN IN WATER ACETIC-ACIDSODIUM-ACETATE SOLUTIONS ON A ROTATING-RING DISC ELECTRODE

The measurement of oxygen transit time from ring to disc of a rotating ring disc electrode was used to determine the diffusivity of oxygen. The solubility of oxygen under atmospheric pressure was deduced from m easurement of the limiting current of oxygen reduction in a saturated solution. The density and the kinematic viscosity of the solutions wer e also measured. The correlations obtained were used to calculate the following properties of four water-acetic acid-sodium acetate solution s: density, kinematic viscosity, absolute viscosity, diffusivity and s olubility of oxygen in a temperature range of 25-80 degrees C. The sol utions had a 5 and 10% water content in weight and a sodium acetate co ncentration of 0.5 and 1 mol [kg (acid + water)](-1). (C) 1998 Elsevie r Science Ltd. All tights reserved.