Studies on Ligninsulfonic Acid (XIII):Solubilization of Orange OT

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Solubilization of Orange OT with sodium ligninsulfonate (LSNa) was studied.<BR>Orange OT was solubilized with LSNa solution of any molecular size or any concentration, and distinct change of solubilization curves at 0.25% was also observed as in case of pinacyanolchloride. However, this change was not owing to formation of association micell.<BR>We suggest that LSNa solution forms the molecular micell but association micell at any concentration of ordinary diluted aqueous solution for determining its physicochemical properties, and that the molecular micell of LSNa is mainly neutral micell above 0.25% and ionic micell below 0.25%. Thus the alternating point of inclination of solubilization curve (or conductivity and diffusion constant, previously reported) is due to the change of ionization degree of LSNa.
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