We tried to seperate complexes of rare earth elements (e.g. neodymium) with citric acid from anorganic forms with zic-hilic columns and C18 columns coupled with ICP-MS but it did not work. Does anyone have a protocol or expertise on this?
Dear Oliver Wiche
From my experience did in ion exchange separation, mostly have done it in dissolve phase in marine environment. Since the metal ions often problem in normal phase (NP) and reverse phase (RP) column separation in chromatography that why i choose using other alternative by separating REE using resin Chelex 100 in size either 50-100 or 100-200 mesh. And the result seen not bad. But back to your case i have found the old paper published by Raymond David Szidon and J.s Fritz in Separation of metal ions on chelating Resin. on 1961. as file below. They have tried to separate the metal ions from citric acid. In my idea you can apply in your experiment. Interesting!!!
Good Luck
Best Regard's
Zolhizir bin Daud
Chelex materials are often used to separate natural organic metal complexes with humic acids or similiar. But if interaction between citric acid complexes of rare earth metals and the stationay phase is stronger than complex stability (thermodynamical and kinetic stability) then you will not have any successful separation between the free and complexed part.
Dear Oliver Wiche
What the Michael Schmidt said is right, but if we try to other group of citric acid (weak organic acid) in organic source such as (e.g fruits or plants) these might be work either using resin chelex 100 or chromatography. The main sensitive part is how the experiment did in precisely pH adjusted especially in chelex column separations.
Regard's
Zolhizir bin Daud
Dear Essaid Bilal,
I never heard about that, but we will try. Thank you very much! This is very interesting!
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