Correlation between the weight loss induced by alkaline ions and the cationic exchange capacity of the Nitella cell wall
1989
Gillet, C. | Cutsem, P. van | Voue, M.
There is a linear relationship between loss of weight and loss of cationic exchange capacity of Nitella cell walls, induced by treatment with alkaline ions. As the rate of CEC loss depends to a much greater extent on the ionic species than does the maximal loss quantity, it is suggested that the alkaline ions compete with the bivalent ions initially adsorbed for a particular type of site. These are different from the carboxylate exchange sites since the equivalent fractions of the alkaline ions adsorbed on to these sites are about the same for external concentrations where the effect of the different ions on weight and CEC loss is, nevertheless, quite different. Such sites give to the matrix pectin its structural coherence by preventing the action of electrostatic repulsive forces. In fact, it also appears that CEC loss is a linear function of the inverse of the square root of the internal ionic strength, a parameter proportional to the Debye length.
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