TWELVE
MULTIPLE ADDRESSEES
H.
TO THE CONBINED IN HC1 ADD 30ML
OF iIIHOH.
ADD NH40H
LIROPhJISETO PH 9, ALLO!I/PPT TO FORi~ CENTRIFUGE,
DISCARD SIJPERNATE. ADD 2-4 HL 11!HC1 TO CENTRIFUGE
IUBE AGITATE UNTIL PPT DISSOLVES.
REPEAT THREE
PWRE TIRES.
I.
AFTER LAST PPT DISSOLVE PPT IN IN HC1.
ADD 30ML
OF DI HOH AiiD WARN IN WATER BATH @ 80 DEGREES C FOR
15 MINUTES.
J.
ADD 3-4 ML OF SATURATED
(NH4)2C204 AND DIGEST FOR
TEN MIi~UTES.
K.
FILTER SAMPLE \,/ITHMILL~poRE
GLASS ;4E!IBRA!1E
FILTER.
App,4RATus THRoUGH TARED
CAREFULLY REF40VE FILTERED
sw:lpLE AND DRY FOR 30 MINUTES AT 1000DEGREES C.
ALLO!4
TO COOL IN A DESICCATOR.
L.
WEIGH
SAMPLE AND RECORD WEIGHT.
PI. COUNT SAMPLE IN LOW BETA BACKGROUND COUNTER.
CALCULATION:
COUIITS
MINUTES
EFFICIENCY
-BACKGROUND CPN
(X) INGRO’ATH (1.O)(X) Y-90 DECAY (X)Y RECOVERY(X) VOLUME (2.22)
= PCI/UNIT
VOLUME