A new formulation of limiting current at the dropping mercury electrode by means of dimensional analysis

The functional relationship of limiting current at dropping mercury electrode, DME, is derived by dimensional analysis. The differences between the resulting and theoretical values depend on the polarographic technique, and on the diffusion coefficient data, D-lambda and D-exp. Dimensional analysis describes the limiting current at DME in function of significant dimensionless groups, Sherwood, Schmidt and Reynolds numbers. The Ilkovic equation, for a dropping mercury electrode, and the Levich equation, for a rotating disk electrode, are compared using dimensionless groups rather than using a large number of operational and physical variables.