Effect of monothiophosphinic acid and phosphine sulfide impurities on the solvent extraction behavior of bis(2,4,4-trimethylpentyl)dithiophosphinic acid from sulfate and methanesulfonate media

Key Points

• To investigate the extraction behavior of dithiophosphinic acid and the influence of impurities on selectivity.
• Comparison of commercial and synthesized dithiophosphinic acid extractants.
• Assessment of Co( ii )/Ni( ii )/Mn( ii ) selectivity.
• Evaluation of physical stability in various extraction media.
• Significant differences in selectivity for Co( ii ), Ni( ii ), and Mn( ii ).
• Variations in physical stability between extractant types.