EDTA and NTA were separated with the ion chromatography column NI-424 (an anion analysis column for non-suppressor method). The calibration curve derived from the chromatograms for the concentrations 20 mg/L, 50 mg/L, 100 mg/L showed a good linearity.


Sample : 100 μL
1. Ethylenediaminetetraacetic acid, EDTA 20 mg/L
2. Nitrilotriacetic acid, NTA, 20 mg/L

Column       : Shodex IC NI-424 (4.6 mm I.D. x 100 mm)
Eluent       : 2 mM H2SO4 aq.
Flow rate    : 1.0 mL/min
Detector     : UV (210 nm)
Column temp. : 40 °C