Abstract
A fundamental flaw in the analysis of Missner et al. (1) is evident from inspection of the equation presented in their letter, in which the overwhelming mass transport resistance for passive diffusion is from an unstirred layer on the trans side of the membrane. This is not a realistic representation of the experimental situation in a microelectrochemical system, where 2-dimensional diffusion greatly enhances mass transport, leads to the establishment of steady-state conditions on a rapid timescale (2–4), and allows the measurement of fast processes (2, 5 … 2To whom correspondence should be addressed. E-mail: p.r.unwin{at}warwick.ac.uk.
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