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首页> 外文期刊>Acta Chromatographica >Modeling of ion-exclusion chromatography and vacancy ion-exclusion chromatography of C _1 -C _6 aliphatic carboxylic acids on a weakly acidic cation-exchange resin
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Modeling of ion-exclusion chromatography and vacancy ion-exclusion chromatography of C _1 -C _6 aliphatic carboxylic acids on a weakly acidic cation-exchange resin

机译：弱酸性阳离子交换树脂上C _1 -C _6脂肪族羧酸的离子排斥色谱和空位离子排斥色谱的建模

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摘要

Ion-exclusion chromatography (IEC), a chromatographic technique based on exclusion of dissociated sample molecules, finds many applications in a variety of analytical separations of weak acids. An alternative technique is vacancy ion-exclusion chromatography (v-IEC), in which the column is equilibrated with the sample solution flowing as mobile phase through the system, and pure water is injected as the sample. In this case, characteristic negative 'vacant' peaks are obtained. The objective of the work discussed in this paper was to investigate retention mechanisms in IEC and v-IEC for selected aliphatic acids, under analytical and concentration overload conditions, with pure water and a weakly acidic cation-exchange resin. The retention times and the peak shapes predicted by the proposed model were in a good agreement for a wide range of concentrations for all the analytes investigated in this study.
机译：离子排阻色谱法（IEC）是一种基于离解的样品分子排阻的色谱技术，在各种弱酸的分析分离中都有许多应用。另一种技术是空缺离子排斥色谱法（v-IEC），其中色谱柱用作为流动相流经系统的样品溶液平衡，并注入纯水作为样品。在这种情况下，将获得特征性的负“空”峰。本文讨论的工作目的是研究在分析和浓度超载条件下，纯水和弱酸性阳离子交换树脂在IEC和v-IEC中对选定脂肪酸的保留机理。对于本研究中研究的所有分析物，在宽范围的浓度下，所提出的模型预测的保留时间和峰形都很好地吻合。

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