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Diffusion tests through wood were made with different HS - concentrations in 1mol/dm 3 NaOH solutions. The molar conductivity at infinite dilution of these mixtures was measured. The porosity of northern pine (Pinus sylvestris), birch (Betula verrucosa) and spruce (Picea abies) was also measured. The model used in the calculations was a combination of the drift speed and steady state...