Selective Detection of Alkaline Earth Ions with Addition of EDTA

Alkaline earth ions were analyzed using IC Y-521. When both alkaline earth and transition metal ions are contained in the sample, the latter ions elute first by adding EDTA-2Na to the eluent, and as the result, the former can be selectively detected . (A) shows the chromatogram without addition of EDTA-2Na and (B) shows the chromatogram with addition of 0.01g of EDTA-2Na per 10mL of sample.

Sample :
1. Zn2+
2. Co2+
3. Mg2+
4. Cd2+
5. Pb2+
6. Ca2+
7. Sr2+

Column       : Shodex IC Y-521 (4.6mmID*150mm)
Eluent       : 4mM Tartaric acid + 2mM Ethylenediamine aq.
Flow rate    : 1.0mL/min
Detector     : Non-suppressed coductivity, Polarity(-)
Column temp. : 40deg-C