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Monovalent and Divalent Cation Standards (4) (Phosphoric Acid Eluent)

Monovalent and divalent cation standards were analyzed using IC YK-421 (a column for cation analysis).
(Advantage of Phosphoric acid eluent)
The standard eluent of IC YK-421 is tartaric acid / dipicolinic acid eluent, but the storage stability of this eluen is poor and The solubility of the reagents used for eluent is also low, It was not possible to prepare the concentrated solution. On the other hand, phosphoric acid eluent is possible to save about one week and the concentrated solution (1mol/L) can be sotred for a long term (six months).
(The difference)
(1) Mg2+ ion elutes after the Ca2+ ions in the case of tartaric acid / dipicolinic acid-based eluent, but elution order of Ca2+ ion and Mg2+ ion is reversed in the case of phosphoric acid-based eluent.
(2) Transition metal ions are eluted at a position of Vo in the tartaric acid / dipicolinic acid eluent, but eluted collectively between Ca2+ ion and Mg2+ ion in the phosphoric acid-based eluent. Therefore, we do not recommend the use of phosphate eluent, if you want to analyze a sample containing a large amount of transition metal ions.
(3) Background of phosphoric acid eluent is higher than tartaric acid / dipicolinic acid eluent.
Please refer to

Sample : 20μL
1. Li+ 2mg/L
2. Na+ 10mg/L
3. NH4+ 10mg/L
4. K+ 20mg/L
5. Mg2+ 10mg/L
6. Ca2+ 20mg/L



Column : Shodex IC YK-421 (4.6mmI.D. x 125mm)
Eluent : 4mM H3PO4 aq.
Flow rate : 1.0mL/min
Detector : Non-suppressed coductivity
Column temp. : 40°C