Anions in tap water were analyzed using IC I-524A (an anion analysis column for non-suppressor method). Since phosphoric ion is not present in this sample, F^-, Cl^-, NO₃^- and SO₄^2- can be separated in a short time without t he interference of phosphoric ion peak using this eluent. When both F^- and H₂PO₄^- are present, they cannot be separated each othe with this analysis conditionr.


Sample : Tap water, 100 μL
1. F^-
2. Cl^-
3. NO₃^-
4. SO₄^2-

Column       : Shodex IC I-524A (4.6 mm I.D. x 100 mm)
Eluent       : 2.5 mM Phthalic acid + 2.3 mM Tris(hydroxymethyl)aminomethane aq.
Flow rate    : 1.2 mL/min
Detector     : Non-suppressed coductivity
Column temp. : 40 °C