Separation of Noble Metals by Donnan Dialysis

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Abstract
Donnan dialysis has been demonstrated to be a useful technique not only for the enrichment of metal ions but also for their separation. Our studies indicate that Donnan dialysis may be applied to the separation of gold from some platinum group metal ions. It was found that after Donnan dialysis, some tested metal ions–as chloride complexes–were distributed among three phases: sample, receiver electrolyte, and membrane. Different receiver solutions as well as different ligands were investigated to differentiate the transport rate.