Summary
The influence of column temperature on elution behaviour of several ions on anion-exchange resin beds of the Dionex Ion Pac type was investigated. Iodate, bromate, bromide and iodide ions were separated on Ion Pac AS9SC column in the temperature range of 10°C–55°C, using NaHCO3/Na2CO3 and NaHCO3 eluents. Free energy, enthalpy and entropy changes for respective ion exchange reactions were calculated and compared with literature data for classical gel type exchangers. In most cases the enthalpy change was a function of temperature. The work at elevated temperatures caused progressing resin degradation i.e. loss of strongly basic groups, accompanied by formation of weakly basic groups and also some weakly acidic groups. Similar resin degradation was observed for Ion Pac AS5 column. Observations on the changes of the plate height with the retention factor and temperature lead to conclusion that in some circumstances longitudinal diffusion in the resin phase also contributes to the total plate height.
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Dybczyński, R., Kulisa, K. Observations on the effect of temperature on performance and stability of anion exchange columns in ion chromatography. Chromatographia 57, 475–484 (2003). https://doi.org/10.1007/BF02492544
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DOI: https://doi.org/10.1007/BF02492544