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In the paper the numerical solution of Nernst–Planck equations is considered taking into account the Poisson equation. The proposed difference scheme was used to solve a pair of problems with two components: the ambipolar diffusion and the liquid junction. It is shown that the concentration level critical for the Planck condition depends on the concentration gradient to the power 2/3. This dependence allows one to estimate the applicability of the Planck condition to different electrochemical systems.
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Martuzāns et al. (1998) studied this question.
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