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Unexpected aliphatic acid peak profiles — Preliminary investigations

Zapała W., Kostka J, Kaczmarski K.

Acta Chromatographica

2011

Vol. 23, no. 4

673--679

A hypothetical retention mechanism is proposed for the modeling of the strongly distorted peak profiles of four aliphatic acids on the Acclaim RS PA2 column. The obtained experimental band profiles are mathematically described with the modified POR model of the chromatographic column.

Comparison of different columns in analysis of C1–C5 aliphatic acids mixture in ion exclusion chromatography and vacancy ion exclusion chromatography modes

Zapała W., Kostka J, Kaczmarski K.

Acta Chromatographica

2011

Vol. 23, no. 3

377--388

Ion exclusion chromatography (IEC) is a chromatographic technique based on the exclusion of dissociated sample molecules. This method has many applications in various analytical separations of weak acids. An alternative technique is the vacancy IEC (v-IEC), where the column is equilibrated with the sample solution flowing as mobile phase through the system, whereas pure water is injected as a sample. In this case, characteristic negative “vacant” peaks are obtained. The aim of this paper is to compare the efficiency of four RP-HPLC columns in the separation of C1–C5 aliphatic acids mixture by use of classical HPLC and very high pressure liquid chromatography. The investigations were conducted in IEC and v-IEC modes.

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

Zapała W., Kaczmarski K

Acta Chromatographica

2010

Vol. 22, no. 3

337--356

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.