Please use this column with suppressor type ion chromatograph.

In line with Japan’s updated water quality regulations, chlorate was added to the water quality standards under Ministerial Ordinance No. 135* (November 14, 2007), effective April 1, 2008. Furthermore, the official methods specified in “Methods Prescribed by the Minister of Health, Labour and Welfare Based on the Provisions of the Ordinance on Water Quality Standards” (MHLW Notification No. 261, July 22, 2003; last amended November 14, 2007) were revised to include chlorate in “Table 13: Simultaneous Analysis Method for Anions by Ion Chromatography.” To prevent the formation of nitrate from nitrite and chlorate from chlorite due to residual chlorine, the method specifies adding 1 mL of 50 mg/mL ethylenediamine (EDA) solution per 1 L of sample at the time of collection. The method in Table 13 mentions using suppressor-type columns packed with polymer-based gel modified with anion-exchange groups, or columns offering equivalent or superior separation performance. Using IC SI-35 4D, a suppressor-type rapid oxyhalide analysis column, we analyzed standard solutions and tap water samples with EDA added. IC SI-35 4D enables simultaneous analysis of oxyhalides and inorganic ions within 15 minutes and without interference from EDA.
**Target analytes in Table 13 include nitrite nitrogen, nitrate nitrogen, fluoride, chlorate, and chloride ions.

*The version at the time of the application acquisition.

Sample: 20 µL each
(Standard solution) Standard anions containing 50 mg/L of EDA
(Tap water) containing 50 mg/L of EDA

1. 1.F^- 2 mg/L
2. 2.ClO₂^- 1 mg/L
3. 3.BrO₃^- 1 mg/L
4. 4.Cl^- 10 mg/L
5. 5.NO₂^- 5 mg/L
6. 6.Br^- 10 mg/L
7. 7.ClO₃^- 1 mg/L
8. 8.NO₃^- 30 mg/L
9. 9.HPO₄^2- 15 mg/L
10. 10.SO₄^2- 40 mg/L