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

Table 2

Extraction behaviour of neodymium(III) as a function of organic acid concentration. Nd(III) = 60 μg, pH = 6.0, N-n-octylaniline = 0.1 M in xylene (10 mL), Aq : Org = 25 : 10, strippant = 0.1 M HClO₄ (2 × 5 mL), equilibrium time = 5 min.

Acid (M)	Sodium salicylate		Sodium succinate		Sodium malonate		Ascorbic acid
	%𝐸^a	𝐷^b	%𝐸^a	𝐷^b	%𝐸^a	𝐷^b	%𝐸^a	𝐷^b
0.005	13.6	0.39	24.6	0.815	20.0	0.63	9.3	0.25
0.01	33.0	1.23	42.6	1.85	31.0	1.12	17.5	0.47
0.02	47.2	2.23	57.4	3.36	52.8	2.80	27.0	0.93
0.03	57.1	3.33	82.0	11.38	61.7	4.03	36.8	1.45
0.04	67.2	5.12	94.8	45.57	78.0	8.86	46.7	2.19
0.05	83.2	12.38	100	∞	85.0	9.66	61.7	4.03
0.06	88.4	19.10	100	∞	89.0	20.23	69.3	5.64
0.07	85.2	14.39	100	∞	92.5	30.83	77.4	8.56
0.08	81.4	10.94	97.1	83.7	83.2	12.38	83.5	12.65
0.09	78.6	9.18	96.2	62.30	76.8	8.27	63.5	4.35
0.1	72.2	6.49	92.5	30.83	75.1	7.54	58.8	3.56
0.2	66.3	4.92	83.2	12.38	67.5	5.19	53.0	2.82

^aPercentage extraction, ^bdistribution ratio.