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

Table 3

Determination of Th(IV) in the synthetic mixtures.

Samples	Th (mg/L) added	Th found (mg/L) ()
1	2	2.4 ± 0.1
2	3	3.5 ± 0.2
3	4	3.7 ± 0.2
4	5	5.6 ± 0.4

() Average of five measurements.