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Ion-exclusion chromatography of aliphatic carboxylic acids on an unmodified silica gel column


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Ohta, K and Tanaka, K and Haddad, PR (1996) Ion-exclusion chromatography of aliphatic carboxylic acids on an unmodified silica gel column. Journal of Chromatography A, 739 (1-2). pp. 359-365. ISSN 0021-9673

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In order to demonstrate the effectiveness of a silica gel column in ion-exclusion chromatography, the elution behavior of aliphatic carboxylic acids was investigated on an unmodified silica gel column having cation-exchange characteristics. When water was used as an eluent, the elution order of the carboxylic acids was dependent on the pKa and the hydrophobicity, but the resolution between strong acids, e.g. HNO3, and carboxylic acids was not satisfactory. Therefore, the composition of eluents containing sulfuric acid and organic modifiers was investigated for the separation of HNO3 and C1–C10 aliphatic carboxylic acids. When 0.5 mM sulfuric acid containing 0.05% heptanol was used as an eluent, an excellent ion-exclusion chromatographic separation was achieved in 30 min using UV-detection at 220 nm.

Item Type: Article
Keywords: Mobile phase composition; Organic modifiers; Carboxylic acids; Sulfuric acid
Journal or Publication Title: Journal of Chromatography A
Page Range: pp. 359-365
ISSN: 0021-9673
Identification Number - DOI: 10.1016/0021-9673(96)00213-0
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Date Deposited: 05 May 2008 11:57
Last Modified: 18 Nov 2014 03:39
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