Alkali metal ions can be analyzed with a 4mM nitric acid eluent. When using nitric acid eluent, the divalent and trivalent cations in the sample are absorbed onto the column, thus after the injection of many samples the ion exchange capacity decreases. When this phenomenon happens, 100 µL of 1M HNO3 should be injected several times to regenerate the column. When performing analysis of monovalent cations using IC Y-521 column, use a line filter IC Y-521L upstream of the injector.
Column : Shodex IC Y-521 (4.6mmID*150mm)
Eluent : 4mM HNO3 aq.
Flow rate : 1.5mL/min
Detector : Shodex CD, Polarity(-)
Column temp. : 40°C