Reversed-Phase Column Extractive Separation of Gd(III) with Poly[dibenzo-18-crown-6]

Table 2

Diverse ion effect (Gd(III): 100 μgmL⁻¹, sorption: 1 × 10⁻³ M picric acid, eluent: 0.5 M HCl).

Ion	Added as	Tol. limit (mg)	Ion	Added as	Tol. limit (mg)
Li^+	LiCl	4	Al^3+	Al2(SO4)3·16H2O	0.5
Na^+	NaCl	4	Zr^4+	Zr(NO3)4·4H2O	1
K^+	KCl	2	La^3+	La(NO3)3	0.8
Rb^+	RbCl	5	Ce^3+	CeCl2·6H2O	0.2
Cs^+	CsCl	4	V^4+	VOSO4·4H2O	0.4
NH4^+	NH4Cl	4	Th^4+	Th(NO3)4	0.2
Be^2+	BeSO4·4H2O	0.1	Mo^6+	(NH4)6Mo7O244H2O	0.9
Ca^2+	CaCl2	0.4	W^6+	Na2WO4·4H2O	0.8
Sr^2+	Sr(NO3)2	0.5	U^6+	UO2(NO3)2·6H2O	0.5
Ba^2+	Ba(NO3)2	0.3	Cl^−	HCl	3
Co^2+	CoCl2·6H2O	8	Br^−	HBr	4
Ni^2+	NiCl2·6H2O	0.8	SCN^−	NaSCN	1
Mn^2+	MnCl2·4H2O	2	ClO4^−	HClO4	5
Zn^2+	ZnCl2	0.5	CH3COO^−	CH3COOH	5
Cd^2+	(CH3COO)2Cd·H2O	3	SO4^2−	H2SO4	0.8
Pb^2+	Pb(NO3)2	1	Tartrate	Tartaric acid	4
Cr^3+	Cr(NO3)3·9H2O	0.5	EDTA	EDTA	4
Fe^3+	FeCl3·6H2O	0.1	Ascorbate	Ascorbic acid	4
Cu^2+	CuCl2	0.8	Citrate	Citric acid	4