Solvent Extraction Separation of Manganese (II) with Tributyl Phosphate

A fast and selective method is proposed for solvent extraction of manganese with tributyl phosphate. It is possible to quantitatively extract manganese with 40% tributyl phosphate in xylene from solutions containing 1 M hydrochloric acid and 2.5 M aluminum chloride as the salting-out agent. The metal from the organic phase is stripped with water and is determined photometrically as its complex with formaldoxime. The probable composition of the extractable species at 1 M acidity is [MnCl2·3TBP]. It is possible to extract manganese in the presence of a twentyfold excess of common ions, but mercury, copper, iron, bismuth, and vanadium interfere. The standard deviation is ± 1.05%.