Page 266 - Radiochemistry and nuclear chemistry

250 Radiochemistry and Nuclear Chemistry

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A SMALL AMOUNT (WOO) OF
99Mo(V1) OF KNOWN SPECI-
FIC ACTIVITY (80) 18 ADDED
TO SOLUTION OF COMPLEX CYCLOHEXANE
MIXTURE CONTAINING AN CONTAINING
UNKNOWN QUANTITY (w u g) TOPO 18 ADDED.
OF SAME COMPOUND. !
SOLUTION IS HEATED TO
MAKE SURE OF ISOTOPIC
EXCHANGE.

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/ r..-t

1 !
TWO-PHASE
LIQUID-LIQUID
MIXTURE IS SAMPLE OF ..... EVAPORATED
STIRRED, AND Mo(VI} ORGANIC PHASE TO DRYNESS.
IS QUANTITATIVELY IS WITHDRAWN
EXTRACTED. AND ......

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FROM SPECIFIC ACTIVITY
(Sin " Rm lwm)
UNKNOWN WEIGHT (w u g) )
m IS CALCULATED BY EQ. (9.8)
411 -o-(E-1)-o
tll
' O O O ODO|O'

SAMPLE IS COUNTED (Rm) AND ...... ..... WEIGHED (win).

FIG. 9.5. Sequence of steps in isotope dilution for determining the amount of a Mo(VI)
complex in a composite mixture.

in the original sample is calculated by

w u = (S o/S m- l)w o (9.8)