High Sensitive Detection of Cations

Monovalent and divalent cation standards were analyzed using IC YK-421. Using a highly sensitive conductivity detector, cations whose concentrations are micro-g/L(=ppb) level can be detected. Minimum detection levels are shown in the table(S/N=3). The figures in parentheses are minimum concentrations when 100 micro-L of sample is injected.

004

Sample	Minimum detection levels (S/N=3)
1. Li⁺	–	–
2. Na⁺	0.15ng	(1.5 micro-g/L)
3. NH₄⁺	0.30ng	( 3 micro-g/L)
4. K⁺	0.60ng	( 6 micro-g/L)
5. Ca²⁺	0.20ng	( 2 micro-g/L)
6. Mg²⁺	0.20ng	( 2 micro-g/L)
( ) : minimum concentrations when 100 micro-L of sample is injected.


 Column : Shodex IC YK-421 (4.6mmID*125mm)
 Eluent : 5mM Tartaric acid + 1mM Dipicolinic acid + 1.5g/L Boric acid aq.
 Flow rate : 1.0mL/min
 Detector : Shodex CD
 Column temp. : 40°C