Linearity of Calibration Curves

The figure shows calibration curves of IC NI-424for 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 :
1. H₂PO₄^-
2. Cl^-
3. NO₂^-

Column       : Shodex IC NI-424 (4.6mmID*100mm)
Eluent       : *2.1mM Phthalic acid + 2.9mM Amino-n-capronic acid + 6mM Phenylboronic acid(pH3.9)
Flow rate    : 1.0mL/min
Detector     : Shodex CD
Column temp. : 40deg-C

^* The prescribed pH can be obtained by mixing the reagents in the composition described here.