Analysis of Oxyhalides and Anions in Tap Water (SI-52 4E)

Chloric acid should be analyzed by ion chromatography for water quality control in accordance to the Ministry of Health, Labor and Welfare in Japan. The method states an addition of 1 mL ethylenediamine solution (50 mg/mL) to 1L of sample collected. This prevents chlorous acid from reacting with residual chlorine to form chloric acid. Oxyhalides and anion standards in river water were analyzed using IC SI-52 4E.

Sample : 50µL

Std. (1mg/L each) containing
EDA 50mg/L

Sample : 50µL
River Water containing EDA 50mg/L

1. F^–

2. ClO₂^–

3. BrO₃^–

4. Cl^–

5. HCO₃^–

6. NO₂^–

7. Br^–

8. ClO₃^–

9. NO₃^–

10. PO₄^3-

11. SO₄^2-

 Column : Shodex IC SI-52 4E (4.0mmID*250mm)
 Eluent : 3.6mM Na2CO3 aq.
 Flow rate : 0.8mL/min
 Detector : Suppressed conductivity
 Column temp. : 45°C