Serial separation of cations and anions by ion chromatography using the peak parking technique and sulfosalicylic acid as the eluent.
An improvement of the peak parking technique is described for the serial determination of cations (Na+, NH+4, K+, Mg2+, and Ca2+) and anions (Cl-, SO2-(4), and NO-3) using a single pump, a single eluent and a single detector. The present system used commercially-available unmodified cation exchange and anion exchange columns, which were attached to each switching valve. When 1.75 mM 5-sulfosalicylic acid was used as the eluent, serial separation of the above cations and anions was achieved in less than 20 min. The proposed ion chromatographic method was successfully applied to the serial determination of cations and anions in tap water and river water samples. The limits of detection at S/N=3 for an injection of 20 microl were 16-68 ppb (microg/l) for cations and 15-28 ppb for anions.
Amin
Muhammad
M
Department of Chemistry, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan.
Lim
Lee Wah
LW
Takeuchi
Toyohide
T