Fig. 4: Effect of ascorbic acid on iron and REE extraction from HCl and citrate leachates.

a Distribution, D, of iron in HCl and citrate leachates with and without the addition of 25 mM ascorbic acid. b Recovery, R%, of iron and total REEs from HCl and citrate leachates with and without the addition of 25 mM ascorbic acid.