Another influence of pH is in influencing the state of ionization of the collector. Amines are cationic in acidic pH range. In alkaline pH, the long chain amines occur in neutral molecular state and not suitable as cationic reagente. In between the two ranges, within a narrow pH range they occur as ionomolecular complexes comprising ionic and neutral molecule species and they are highly surface active in this form. This also applies to weak acid collectors like sodium oleate, which is anionic in the alkaline pH range, but occurs in neutral molecular state at pH below 4. For further discussion see Rao and Leja (2004)
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