Dear Scientific Community,
I am wondering if anyone knows what options are available if you have e.g. Barium sulfate, and want Barium to dissociate/release from the sulfate (SO4 2-).
Which reagent/molecule (Mg, Ca, carbonate, chromate etc.) can I add to make Barium soluble again or to be bound to another group?
Preferably as Barium carbonate since I can dissolve carbonate by acid and hopefully get Ba2+ again. Then, which intermediate steps would be necessary to move Barium from sulfate to carbonate?
I have tried adding NaOH in hope to promote Na2SO4 and release Barium, but this did not seem to work in my experiment (the supernatant did not contain Ba).
Furthermore, if I would have added NaCO3 and centrifuged the solution, it would not help me either, since both Barium sulfate and Barium carbonate would precipitate in alkaline solution.
I guess it is a question on how to overcome the strong bonding between alkaline earth metal and sulfate, and then try to proceed from there.
Thank you very much for your time
Dear Eron,
Thank you very much for your reply!
Interesting approach.
Do I understand correctly:
1) Raise pH to above 7 (for preserving CO3)
2) Add Na2CO3 in excess and heat solution to 70C
3) Barium dissociates from -SO4 and binds to -CO3
4) Add HCl to dissolve the -CO3, thus releasing Ba2+ in solution
5) Centrifuge the solution to separate Na2SO4 (and other elements bound to -SO4) which will precipitate
6) The supernate contains Ba2+
Thank you again!
Kind regards
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