~
ta
th
Transfar samtle solucien to a 1
ai separatecry funnel and excraccz
the yttrium with 60 ml of 20% HDEHP solution.
tion.
15.
Note time of extrac-
Save aqueous phase for possible future reanalysis.
Wash the organic phase twice with 60 ml of 0.08 N HCl.
Save the
first wash and combine the aqueous phase from step 14.
16.
Extract the yttrium from the organic phase with 2, 60 ml volumes
of 3 N HNO...
3
bine 3 N HNO.
17.
Shake for 2 minutes for each extraction and then com-
3
solutions
in a 150 ml beaker.
Evaporate the sample solution to a volume of approximately 3 ml
and quantitatively transfer to a 50 ml centrifuge tube with several volumes of water.
18.
Adjuse the pH to 8-10 with MH,OH to precipitate ¥COH) 4.
19.
Centrifuge, decant and discard supernatant liquid.
20.
Wash the precipitate with water, centrifuge, discard wash.
2l.
Dissolve the precipitate in 1:1 HCl (a few drops), slurry and add
25 ml water.
22.
Add saturated oxalic acid (2-3 ml), then 2-3 drops of NH, OH.
Di-
gest at 85°C for 1 hour.
Filter through a preweighed glass fiber filter disc, wash with
water and ethyl alcohol.
24.
Dry at 110°C for 15 minutes.
Weigh the dried precipitate and filter paper.
Mount on nylon
disc, cover with 0.25 ml mylar and beta count for 60 minutes using
low background anti-coincidence counters.
25.
Correct for gravimetric yttrium yield and yttrium decay single
separation.
26.
Reporct data in pei/l urine at time of collection.
24