Universal Detection of Ions by Replacement-Ion Chromatography Employing an Anion-Replacement Method and an Ultraviolet-Visible Spectrophotometric Detector.
INDIANA UNIV AT BLOOMINGTON DEPT OF CHEMISTRY
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A new ion-chromatographic IC detection method involving replacement-ion chromatography RIC and an anion-replacement arrangement is employed for cation and anion analysis. In the instrument, a conventional dual-column IC system is followed by a continuously regenerated anion-exchange ionomeric fiber, which serves as the replacement column. This third column converts all ionic solutes into their iodate or nitrate salts, which are detected sensitively at 215 nm by a UV-visible spectrophotometer. This detection method is especially useful for cation separation, for which the influence of various system parameters are discussed in detail. Good precision RSD5, low detection limits 1-15 ng, and universal calibration were achieved for several monovalent cations. However, the method does not appear to be useful for anion determinations. Keywords Ion chromatography Replacement ion chromatography Chromatographic detectors.
- Physical Chemistry
- Test Facilities, Equipment and Methods