PITTCON 08 Oral Session
Effect of eluent composition and column temperature on IC column retention times
Session Number 2790-4
Abstract
In ion chromatography the selectivity of the column is of paramount importance. Demanding separation problems require the possibility to alter the retention times and sometimes even the elution order of specific compounds. Therefore, the effect of varying eluent compositions and column temperatures on the retention time of cations was investigated for the Metrosep C 2 – 150 column. The present study focuses on alkali metals, alkaline earth metals, transitions metals and simple amines. Conductivity detection was used for all experiments performed. Different concentrations of tartaric acid, citric acid, oxalic acid, and nitric acid in ultrapure water (resistivity < 18 M? cm have been tested. Dipicolinic acid was used as organic modifier in the eluent. Additional measurements were carried out using up to 25% acetone. This communication evaluates to what extent the eluent composition and the column temperature affect the retention times of different cations on the Metrosep C 2 – 150 column.
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