Table 5. Overall Distribution Coefficient (D), Selectivity (S), Extraction Efficiency (α), and Extraction Affinity (β) of Solutes.

TBPBr/EG (1:2)				TBABr/EG (1:2)
D	S	α (%)	β (%)	D	S	α (%)	β (%)
8.19	661.3	89.12	99.85	5.75	123.74	85.18	99.20
6.18	1093.8	86.08	99.91	5.39	141.19	84.36	99.30
5.04	881.4	83.44	99.89	4.55	125.36	81.98	99.21
5.15	794.5	83.75	99.87	3.86	143.71	79.42	99.31
3.50	432.22	77.77	99.77	4.03	169.51	80.13	99.41
3.63	376.16	78.41	99.73	3.19	116.36	76.12	99.15