Solvent Extraction of Thorium Using 5,11,17,23-Tetra[(2-ethyl acetoethoxyphenyl)(azo)phenyl]calix[4]arene

Table 2

Effect of diverse ions on the determination of Th(IV) (relative error ± 5.0%).

Ion	Added	Tolerance limit; (molar ratio)
Na^+	NaNO3	150
K^+	KNO3	100
Ca^2+	Ca(NO3)2	100
Mg^2+	Mg(NO3)2	100
Cu^2+	CuSO4	10
Ni^2+	NiCl2	20
Zn^2+	ZnCl2	15
Fe^3+	Fe(NO3)3	20
Cr^3+	Cr(NO3)3	10
Pb^2+	Pb(NO3)2	10
Hf^4+	Hf(NO3)4	10
Zr^4+	Hf(NO3)4	20
Sm^3+	Sm(NO3)3	20