Determination of inorganic cations and anions by ion-exchange chromatography with evaporative light-scattering detection |
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Authors: | Mouchère F El Haddad M Elfakir C Dreux M |
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Institution: | Institut de Chimie Organique & Analytique, Université d'Orleans, UMR 6005, France. |
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Abstract: | Evaporative light-scattering detection (ELSD) was investigated for the direct determination of alkali and alkaline-earth cations by cation-exchange chromatography. Successful single run analysis of Na+, K+, Mg2+ and Ca2+ was achieved in 11 min on the Hamilton PRP-X200 column using an aqueous solution of ammonium formate as mobile phase under a salt concentration step gradient mode (20 mM and 100 mM). Surprisingly the use of ELSD reveals a weak retention of inorganic anions (Cl-, NO3-, SO4(2-)) onto the polymeric cation exchanger, which enables the simultaneous determination of inorganic anions (C1- and NO3-) associated with the cations analysed (Na+ and K+). |
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