Abstract
The addition of divalent metal cations to the background electrolyte influences the migration time of organic acids that are involved in complexation equilibria with the metals. This effect derives from a change in charge distribution and represent a means of manipulation of selectivity. In the present investigation, we evaluated the effects produced on the separation of a test mixture, composed of aromatic and aliphatic acids, by a series of divalent cations added to the background electrolyte. The use of a coated capillary allowed us to exclude the influence of wall effects on the separation.
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