Experimental realization of sustained simple kinetic regimes of release of particulate solutes subject to slow dissolution in the containing matrix

We examine the short-time and long-time limiting cases of the general equation commonly used to describe the kinetics of release of a particulate solute embedded in a planar solid matrix, complicated by slow dissolution of the particles in the matrix. The conditions under which the said limiting cases may be expected to yield sustained simple kinetic regimes of solute release in practice are determined. Finally an experimental illustration of the (simultaneous) occurrence of both simple regimes in a single system (consisting of strongly soluble and sparingly soluble salts embedded in an emulsified asphalt matrix) is given.