Tap water and rain water were analyzed using IC Y-521. Tap water does not contain ammonium ion. However, rain water contains ammonium ion in spite of low concentration of Na+ and K+.
Column : Shodex IC Y-521 (4.6mmID*150mm)
Eluent : 4mM HNO3 aq.
Flow rate : 1mL/min.
Detector : Shodex CD, Polarity(-)
Column temp. : 40°C