Monovalent and Divalent Cation Standards (5) (Phosphoric Acid +

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