期刊
JOURNAL OF CHROMATOGRAPHY A
卷 914, 期 1-2, 页码 167-173出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0021-9673(00)01197-3
关键词
evaporative light-scattering detection; detection, LC; inorganic cations; inorganic anions; alkali metals; alkaline-earth metals
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-, SO42-) onto the polymeric cation exchanger, which enables the simultaneous determination of inorganic anions (Cl- and NO3-) associated with the cations analysed (Na+ and K+). (C) 2001 Elsevier Science B.V. All rights reserved.
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