Analysis of iron-rich hydrochloric acid solutions for uranium, thorium, rare-earth elements and other heavy metals

Journal of Analytical Science and Technology

Table 6 Analytical data of trace REEs in spent HCl (138 g L⁻¹ Fe) and recovered HCl (23 g L⁻¹)

Element	Unit	Spent HCl containing 138 g L⁻¹ Fe		Recovered HCl containing 23 g L⁻¹ Fe
		SX (n = 5)	IE (n = 5)	SX (n = 5)	IE (n = 5)
La	mg L⁻¹	70.0	50.0	13.0	14.0
Ce	mg L⁻¹	122.0	94.0	22.0	20.0
Pr	mg L⁻¹	14.8	11.0	2.5	2.1
Nd	mg L⁻¹	58.0	45.0	10.2	8.4
Sm	mg L⁻¹	9.0	7.0	1.7	1.4
Eu	mg L⁻¹	0.58	0.52	0.11	0.10
Gd	mg L⁻¹	4.20	3.80	0.69	0.61
Tb	mg L⁻¹	0.37	0.50	0.07	0.07
Dy	mg L⁻¹	1.70	1.50	0.28	0.23
Ho	mg L⁻¹	0.36	0.28	0.06	0.04
Er	mg L⁻¹	0.70	0.60	0.10	0.10
Tm	mg L⁻¹	0.10	0.07	0.02	0.01
Yb	mg L⁻¹	1.00	0.50	0.17	0.06
Lu	mg L⁻¹	0.11	0.08	0.02	0.05
Y	mg L⁻¹	4.70	4.20	0.79	0.65