Chimactiv - Interactive numerical educational resources for the analysis of complex media

Exercise 1: Ionic chromatography

I) In order to dose the fluoride, chloride, nitrate, sulfate and carbonate anions in drinking water, a laboratory wishes to develop a method of analysis by ionic chromatography. Which mobile phase will be the most suitable?

Mix of water and methanol
Sodium hydrogenocarbonate (NaHCO₃)
Calcium nitrate (CaNO₃)
Hydrochloric acid (HCl)

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During the analysis, the chromatogram obtained during the separation of the anions is as follows (cf. the ionic chromatography):

Graph with the elution time in minutes on the abscissa, and the detector signal intensity on the ordinate. The curve forms 4 distinct peaks.

II) You can see that only 4 out of 5 anions have been detected. Which one is not detected by ionic chromatography?

Fluoride (F^-)
Chloride (Cl^-)
Nitrate (NO₃^-)
Sulfate (SO₄^2-)
Carbonate (CO₃^2-)

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III) According to the information about retention in ionic chromatography, drag and drop the anions according to their order of elution (to understand why cf. Ionic chromatography)