Monovalent and divalent cation standards were analyzed using IC YK-421.

- Sample : 10μL
- Li+ 1mg/L
- Na+ 5mg/L
- NH4+ 5mg/L
- K+ 10mg/L
- Rb+ 30mg/L
- Cs+ 30mg/L
- Ca2+ 10mg/L
- Mg2+ 5mg/L
- Sr2+ 10mg/L
- Ba2+Â 10mg/L
Column : Shodex IC YK-421 (4.6mmI.D. x 125mm) Eluent : 5mM Tartaric acid + 1mM Dipicolinic acid + 1.5g/L Boric acid aq. Flow rate : 1.0mL/min Detector : Non-suppressed coductivity Column temp. : 50°C