A simple transient approach to dynamic metal speciation: Can independent of time complex voltammetric lability criteria be used?

In this paper, a simple approximated transient solution for dynamic metal speciation is discussed. From this, the validity of the extensively used time-independent solution to study metal complexation is checked, proving that it is restricted to the case of very high stability constants, long times or small radius values.Moreover, the linear diffusion and reaction layer thicknesses are defined and used to study complex lability, pointing out that the latter depends on kinetic parameters but also on geometrical ones, which is not considered in a wide literature.