Chapter 25 Lower carboxylic acids

Add time:08/31/2019    Source:sciencedirect.com

Publisher SummaryThis chapter discusses lower carboxylic acids. The most important technique used for the chromatography of acids is ion-exchange chromatography. Such separations are because of the presence of carboxyl group, the ionogenic properties of which permit the separation of acids based on various ion-exchange mechanisms. The anions of organic acids are retained on anion exchangers by a force that depends on their acidity. This fact is used in the chromatographic separation of organic acids on anion exchangers in the hydroxyl, carbonate, formate, acetate, and chloride forms. The type of ion-exchange chromatography to be used in a particular instance depends on the nature of the acids to be separated and on the form in which the sample is supplied. If only acids are present in the sample, the situation is simple and a suitable method can be chosen directly. Non-ionogenic substances pass through the column and then the acids are displaced from the column, affording a sample that can be separated further by selected methods.

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