The figure shows calibration curves of IC NI-424 (an anion analysis column for non-suppressor method) for three kinds of anions. The calibration curves for chloride and nitrite ions exhibit linearity in a range between 0.01 and 100 mg/L. For phosphoric acid ion which has low sensitivity, the calibration curve exhibits linearity in a range between 0.1 and 100 mg/L.


Sample : 50 µL
1. H₂PO₄^-
2. Cl^-
3. NO₂^-

Column       : Shodex IC NI-424 (4.6 mm I.D. x 100 mm)
Eluent       : 2.1 mM Phthalic acid + 2.9 mM Amino-n-capronic acid 
               + 6 mM Phenylboronic acid aq.
Flow rate    : 1.0 mL/min
Detector     : Non-suppressed conductivity
Column temp. : 40 °C