6f--
6x
ope
2
ud
oO
2
oO
3 }—
3M HNO3
Rb
4h
Po 3K
9M HNO3
>
-
Cs
<t
mT
oa
ef
_—
0
0
tT |
oO
[
2
ft
EY
3
|
4
5
6
7
8
Jj
9
|
lo
{
oT
J
l2
J
43
14
J
15
|
6
™
I7
J
J8
VOLUME (milliliters)
0.0 pa
oe.
2M NH4NO3
Cs| 9MNH,NO,
z
2
<q
ira
z
e
Ke
ui
oO
z
3
Oo
LJ
>
=
<I
i
li
or
o
2
3
4
5
6
|
7
|
8
l
9
I
io
{
«6
Lot
I2
13
14
15
VOLUME (milfititers)
Fies. 15 anp 16.—Separation of rubidium and cesium using columns of zine ferrocyanide
of rubidium from cesium may be obtained using either
nitric acid or ammonium nitrate as an eluant, but
because the values of Kp for cesium remain large,
even at the highest concentration of the eluents
tested, the recovery of cesium from the column is
likely to be poor. However, under acid conditions, this
exchanger tends to coalesce and not allow the passage
of the eluent through the column, so elution curves
were obtained using only ammonium nitrate (Figure
18). Rubidium is eluted with 6 M ammonium nitrate,