Allow to cool, then centrifuge for 5 minutes.
13.
Decant, pouring the supernatant liquid into a 4O ml centrifuge tube.
14,
Add 1 ml barium carrier solution and 0.5 ml of Na,CrO,.
Repeat
steps 1i and if.
15.
Decant the supernatant liquid into a 2 oz. polyethylene bottle.
16.
Add 3 drops of concentrated HCl and 1 ml yttrium carrier solution.
lf.
Store the solution for two weeks.
Second Milk
1.
Transfer the equilibrated solution to a 40 ml centrifuge tube.
Heat in a water bath regulated at approximately 90°C.
Adjust the pH to 8 with NH,OH, stirring continuously.
H202 (30%).
Add 6 drops of
Continue heating to remove Ha0s.
Cool to room temperature before centrifuging.
the supernatant liquid to a 150 ml beaker.
Decant, transferring
Record the hour and date.
Add 25 mi of distilled water to the precipitate in the centrifuge tube.
Dissolve the precipitate by adding 1:3 HCl dropwise with stirring.
Heat in a water bath and adjust pH to 8 with NH),OH, stirring
continuously.
Cool to roon temperature and centrifuge for 5 minutes.
Combine the
supernatant liquids and save for recovery determinations.
Add 25 ml of distilled water to the precipitate.
Add 1:35 HCi dropwise until the precipitate just dissolves.
Add 20 mg of strontium as holdback carrier.
Heat in ea water bath and adjust pH to 8 with NH,OH, stimving
continuously e
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