44
by a small plug of glass wool at the drawn end (Fig. 4).
(2) To cleanse the resin of water-soluble residues, a
preparatory treatment was employed,
based on a method for the
preparation of "nuclear grade" resins
1960).
(Chemical Process Co.,
Successive elutions of each colum were made as
Step
Eluant
Quantity (m1)
1.
CH30H
10
2.
3.
4,
5.
6.
7.
8.
9.
Deionized water
12M HCl
Deionized water
0.25M NaoQH
1.0M NaOH
Deionized water
QO.1M HCl
2M HCl
25
10
25
10
10
25
20
10
From the 2M sample solution,
follows:
Fe*+ and gn** were adsorbed
on the resin as negatively charged chloride complexes while
the non-complexed cations including niet,
through the columns.
Mn**,
and cu2t passed
Fe*+ was eluted selectively from the
columns with 10 ml of 0.5M HCl, and zn2+ with 25 ml of 0.005M
HCl.
(II) Determination. The determination of zinc was based
on a mixed-color colorimetric method described by Sandell
(1959).
The zinc
(0.005M)
fraction from each separation was
evaporated and the residue taken up in 10 ml of deionized
water.
Separatory funnels of 60 ml capacity were filled with
20 ml of deionized water buffered to pH 4.75 with 5 drops of