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Linearity of Calibration Curves (NI-424)

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 : 50µL
1. H2PO4
2. Cl
3. NO2


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