Based on the method described in the Japanese regulation for water supply, anions were analyzed using IC I-524A (an anion analysis column for non-suppressor method).
Please refer to 'Regulation for Water Supply '.


Sample : 100 μL each
Anion standards solution
1. H₂PO₄^- 10 mg/L
2. F^- 1 mg/L
3. Cl^- 1 mg/L
4. NO₂^- 5 mg/L
5. Br^- 5 mg/L
6. NO₃^- 5 mg/L
7. SO₄^2- 5 mg/L

Tap water

Column       : Shodex IC I-524A (4.6 mm I.D. x 100 mm)
Eluent       : 2.0 mM Phthalic acid + 1.84 mM Tris(hydroxymethyl)aminomethane
               + 300 mM Boric acid aq.
Flow rate    : 1.2 mL/min
Detector     : Non-suppressed coductivity
Column temp. : 40 °C