Abstract
The kinetic inertness of the chromium(III) aquo-ion towards substitution reactions with oxalate has been exploited for selective separation of chromium from other elements. Most transition elements, with the notable exception of chromium, react rapidly with oxalate, and may be sorbed on a strongly basic anion-exchange resin as anionic oxalato complexes. On the other hand chromium sorbed on a cation-exchange resin is not eluted with oxalic acid solutions. This permits separation of chromium from elements which react rapidly with oxalate.
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