Nemst-Haskell equation

For dilute solutions of a single salt completely dissociated, the diffusion coefficient is given by the Nemst—Haskell equation (Gambill, 1958 Reid et al., 1988)... 

The diffusion coefficient of a single electrolyte at low concentrations is expressed by the Nemst-Haskell equation ... 

On dissociation of a salt, ions start to diffuse in a solution. Without an electric potential effect, however, the diffusion of a single salt is treated as molecular diffusion. For dilute solutions of a salt, the Nemst-Haskell equation is used to estimate the dilfusivity coefficient... 

Jeong et al. [101] studied the counteractive facilitated transport of Co-Ni mixture by HFSLM. The mass conservation equations were written along with boundary conditions and solved to get the permeation profiles of metal ions. The diffusivity of Co(Il) and Ni(ll) was used from the literature while that of hydrogen ion was calculated by Nemst-Haskell equation. Stokes-Einstein equation was used for calculating the diffusivity of cobalt-carrier complex and nickel-carrier complex. The authors have shown the concentration profiles of cobalt inside the fiber at various flow rates and described that at low flow rate of feed phase, the concentration of cobalt decreases from the center to the feed-membrane interface. 

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