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Interference of some matrix ions in cation-exchange chromatography
Blaz Divjak1, Walter Goessler, Paul R Haddad
1LEK, Pharmaceuticals, Ljubljana, Slovenia.
Journal of Chromatography. A
|August 29, 2003
Summary
Complex sample matrices in ion chromatography can interfere with analysis. This study explains how matrix ions cause self-elution and eluent changes, affecting cation analysis and peak shapes.
Area of Science:
- Analytical Chemistry
- Chromatography
Background:
- Complex sample matrices in ion chromatography can cause on-column co-processes.
- Understanding these interferences is crucial for accurate ion analysis.
Purpose of the Study:
- To investigate separation phenomena in cation-exchange chromatography under non-linear conditions.
- To explain the chromatographic behavior of cations in complex matrices.
Main Methods:
- Studied cation-exchange chromatography under high matrix ion concentrations.
- Applied concepts like self-elution and micro-gradient elution from anion-exchange chromatography.
Main Results:
- Ammonium ions at high concentrations induced self-elution and on-column eluent neutralization.
- Matrix components and analytes co-eluting caused spectroscopic interferences, altering peak shapes.
Conclusions:
- On-column processes significantly impact cation analysis in complex samples.
- These phenomena, including self-elution and eluent changes, must be considered for method development.