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Conditions for rapid determination of inorganic cations in water by ion‐exchange chromatography and evaporative light scattering detection
Author(s) -
El Haddad Mohammadine,
Mouchère Fabrice,
Elfakir Claire,
Dreux Michel
Publication year - 2001
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/1615-9314(20010801)24:8<669::aid-jssc669>3.0.co;2-z
Subject(s) - chemistry , detection limit , ion chromatography , chromatography , trifluoroacetic acid , ion exchange , aqueous solution , potassium , magnesium , sodium , analytical chemistry (journal) , elution , alkali metal , repeatability , inorganic chemistry , ion , organic chemistry
The simultaneous LC determination of alkali and alkaline‐earth cations is possible by ion exchange chromatography run in an isocratic elution mode, using a polymeric exchanger coated on a spherical silica gel, followed by evaporative light scattering detection. By using an aqueous trifluoroacetic acid (4 mM) isocratic eluent, a successful single run analysis of Na + , K + , Mg 2+ and Ca 2+ , was achieved in 6 min on a LiChrosil® IC CA 2 column. This method provides good linearity for the four calibration curves, and enables a 10 ng absolute detection limit for sodium, magnesium, and calcium and a 25 ng absolute detection limit for potassium, at a signal‐to‐noise ratio of 3. The repeatability determined from six injections was satisfactory for all inorganic cations studied. This methodology has been successfully applied to the direct analysis of mineral waters containing low levels of magnesium in the presence of high levels of calcium as well as low levels of potassium in the presence of high levels of sodium.