Monovalent and Divalent Cation Standards (5) (Phosphoric Acid + 18-Crown 6-Ether Eluent)
With using IC YK-421, when Na+ is contained so much in a sample, analysis of very small quantity of NH4+ is difficult.
Separation of Na+ and NH4+ is improved by adding 18-Crown 6-etherb in phosphate acid aqueous as eluent.
Sample : 20?L
1. Li+ 2mg/L
2. Na+ 10mg/L
3. NH4+ 10mg/L
4. K+ 20mg/L
5. Mg2+ 20mg/L
6. Ca2+ 10mg/L
Column : Shodex IC YK-421 (4.6mmI.D. x 125mm) Eluent : 4mM H3PO4 +nmM 18-Crown 6-ether aq. Flow rate : 1.0mL/min Detector : Non-suppressed conductivity Column temp. : 40°C