Chemistry Reference
In-Depth Information
tAbLe 4.23
Percentage of extraction (
E
%) of europium and thorium nitrates from 1 M
Hno
3
into Dichloromethane Containing the Ligand at Various
Concentrations
[th(IV)]
[eu(III)]
Ligands
10
−
4
M
5 10
−
4
M
10
−
3
M
5 10
−
3
M
10
−
2
M
2.5 10
−
2
M
2.5 10
−
2
M
TOPO
0
0
0
1.4
10.2
64.2
0
a
OΦCMPO
0
0
0
1.6
12.2
70.4
0
b
CPo1
0
5.6
26.8
96.1
100
100
0
CPo2
0
CPo3
2.6
46.9
79.8
100
100
100
24.6
CPo4
0
23.6
62.5
98.8
100
100
20.8
CPo5
0
CPo6
55
29.6
CPo7
9.4
79.4
94.8
100
100
100
94.3
CPo8
0
0
0
30.6
60.1
88.4
0
CPo9
0
CPo10
5.1
62.6
87.9
100
100
100
92.0
CPo11
0
1.9
4.6
28.4
50.0
76.5
CPo12
20
45
CPo13
0
CPo14
0
0
1.1
10.3
24.0
54.5
CPo15
0
6
CPo16
0
1.1
3.6
38.8
68.2
91.4
CPo17
0
0
0
17.0
46.9
85.9
CPo18
60
CPo19
15
CPo20
0
a
%
E
= 18 (
C
L
= 0.25 M).
b
%
E
= 69.5 (
C
L
= 0.25 M).
calixarenes are less efficient than the fully substituted ones. The more efficient com-
pounds are CPo16 > CPo17 > CPo14 > CPo19.
Extraction of neptunium, plutonium, and americium from simulated radioactive
liquid waste was carried out in particular with
tert-
butyl and dealkylated tetramers,
hexamers, and octamers of calixarene [ethoxy(diphenylphosphine oxide)]. Among
these six calixarenes, the highest distribution ratios were obtained with the deal-
kylated calix[8]arene. Using a different sample of the dealkylated hexamer, the
Strasbourg group concluded that this compound is the most efficient. This discrep-
ancy can be explained by the presence of impurities, detected by NMR, which were
probably responsible for the poor performances of the dealkylated hexamer tested
at Cadarache.
