Kinetic and thermodynamic implications of some commonly used rate laws for glass dissolution

The dissolution/leaching of glasses and, in particular, nuclear waste glasses has been the subject of much experimental and theoretical work over the last decade. One area which does not seem to have received as much attention, however, is the investigation of the implications of the rate laws which are so often used to interpret leaching experiments. In this paper several rate laws are examined. The concern is not with the details of the dissolution of the complex waste glasses, but with the broader issues of system dynamics. Two of the rate laws, the simple linear driving force (SLDF) and linear driving force/linear driving force (LDF/LDF) models, have been successfully used to interpret the results of static glass leaching experiments. The third model, zero order/linear driving force (ZO/LDF), has been used to describe the dissolution of minerals