Distribution Coefficients—The distribution coeffi-
cients for the partition of cesium and rubidium be-
103
eee ony ay an ne
tween zirconium ferrocyanide and aqueous solutions
of ammonium nitrate and nitric acid are shown in
Figure 19.
Using nitrie acid, the values of the distribution coefficient decrease from 3143 at zero acid concentration to 1.8 with 9 M acid. The rubidium is not at all
strongly adsorbed, and the values of distribution coefficients decrease from 23.8 at zero acid concentration to 0.56 with 9 M acid. The differences between
the distribution coefficients for cesium and rubidium
for every acid concentration are large.
102
io!
Similarly, there is a very sharp drop in the dis-
Ceen a an rN meeps ear oe
NH4NO3z SOLUTIONS
HNO3 SOLUTIONS
-
Ka
tribution coefficients for cesium from 3143 at zero
NH,4NOz concentration to 123 with 2 M ammonium
nitrate, and then a gradual decrease to 17 for 9 M.
The distribution coefficients for rubidium decrease
from 23.8 at zero ammonium nitrate concentration to
°
io" =
f= CESIUM
The value of the distribution coefficient of 23.8 for
the partition of rubidium between water and zirconium ferrocyanide is lower by a factor of almost one
io!
0.95 at 8 M ammonium nitrate and show poor reproducibility.
hundred for other heavy metal ferrocyanides investi-
|
L
o
+ RUBIDIUM
[odo
i0 8 6
Fic. 17-—Distribution coefficients for partition of cesium
gated.
and rubidium between copper ferrocyanide and nitric acid or
Separation of Cesium and Rubidium from Columns
of Zirconium Ferrocyanide—The short ion exchange
ammonium nitrate.
0.6
NeiRES oidRE ee ae. arta
0.51r—
z
°
Ee 0.4;r—
<
a
ra
z
6 MNH4NO3
Rb
1 PRE that ee, AEPBA
YERe AN REayer RA mE re
an
org
tad
his
age
ves
ure
ite,
2
Zz 03
0.
Oo
ul
>
a 02
a
uJ
rd
8M NH4NO3
0.1
Cs
4
OQ
oO
|
2
°
|
4
l
6
|
8
oO
Oo
g
Lobo
4 2 0 2 4 6 8 10
MOLARITY
FM
gee ae AT RN eT
TT TTET
Zirconium Ferrocyanide
TT TTT
1o*
TT TTTTF
but there appears to be a little contamination with
ceslum.
POT TTT
oe Mae See A RAeR EECNR te IRS
23
oO
|
Io
|
{2
|
14
|
{§
VOLUME {milliliters}
Fic. 18.—Separation of rubidium and cesium using copper ferrocyanide
|
t8