Development of a Reliable Analytical Method for Liquid Anion-Exchange Extraction and Separation of Neodymium(III)

Table 4

Extraction behaviour of neodymium(III) as a function of stripping agents. Nd(III) = 60 μg, sodium succinate = 0.06 M, pH = 6.0, equilibrium time = 5 min, Aq. : Org = 25 : 10 N-n-octylaniline = 0.1 M in xylene, strippant = (2 × 5 mL).

Acid	HCl	HClO4	HNO3	H2SO4
M	Recovery (%)	Recovery (%)	Recovery (%)	Recovery (%)
0.005	47.0	65.7	55.8	34.9
0.01	54.6	73.2	57.9	42.6
0.03	67.5	80.5	68.6	49.3
0.05	69.3	89.3	79.7	63.7
0.07	76.7	98.3	80.3	62.2
0.09	80.3	100	81.0	60.1
0.1	82.2	100	85.9	55.9
0.15	87.3	100	74.8	53.9
0.2	85.7	100	72.0	47.8
0.3	80.2	92.6	67.3	43.6
0.5	73.5	83.9	65.9	29.3
0.7	67.9	78.8	61.2	27.4
1.0	63.5	75.3	57.4	23.5

Water-recovery 62.5%, acetate buffer (1) (pH = 3.42): recovery 55.8%,(2) (pH = 5.57): recovery 63.4%.