Reproducibility of cation suppression

30 times 10 μg/L standard anions injected

Cation chromatography with sequential suppression enables the determination of cations in their
hydrogen carbonate form. The eluent – usually nitric acid – is converted into carbonic acid. Following its decomposition into carbon dioxide and water, the former is continuously removed by the CO2 suppressor.

The reduction of baseline noise thus achieved permits the lowering of the detection limits and improves reproducibility, even at very low cation concentrations. This Application Note shows the reproducibility achieved for cation concentrations of 10 μg/L.

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