Retention behaviour of inorganic anions was investigated on a cryptand-based anion exchange column (Cryptand Al) using NaOH and KOH-based eluents. Due to the ability of the macrocycle to bind cations, the positively charged metalcryptand complexes act as anion exchange sites. In addition, cryptand can be partially protonated and in this form also behaves as anion exchanger. Considering the complexation and protonation mechanisms a theoretical retention model and a general equation were developed for describing the simultaneous effect of the nature and concentration of the eluent on the retention factor k. The parameters of the model were iterated and the ion exchange constants were computed, theoretical and experimental data show a good correspondence with correlation coefficients (r2) 0.9987-0.9998 for KOH and 0.9717-0.9883 for NaOH, experimental and computed data differ maximally 5%.
|Number of pages||6|
|Journal||Acta Chimica Slovenica|
|Publication status||Published - May 3 2007|
- Ion chromatography
- Maerocyclic ligand
- Retention mechanism
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