Chemical Properties of Elements 99 and 100 Page: 24 of 36
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UCRL-2591 Rev.
ice bath just prior to and during precipitation. The LaF was sep-
arated by centrifugation and was washed three times with water. The
precipitate was transferred as a slurry to a platinum plate. It was
then dried, ignited and subjected to alpha particle pulse analysis.
A small amount of hydroxylamine hydrochloride and 200 micrograms of
lanthanum were added to the supernatant and the solution heated at
about 75 C. for 10 minutes. The lanthanum fluoride was subsequently
treated in the same manner as the first lanthanum fluoride precip-
itate described above.
The activity of element 99 was distributed between the precip-
itate and the supernatant in exactly the same ratio as.the curipm;
namely, approximately equal amounts in both fractions since the
precipitation was not complete. Essentially all of the americium
remained in the supernatant and was not carried in the first
lanthanum fluoride precipitate.
Other Properties
The work performed in this laboratory in connection with separations
of the new elements has involved primarily the use of combinations of
precipitation and ion exchange methods. The latter have been described
in preceding sections. It has been implied that the behavior of the new
elements with carriers is the same as is observed with berkelium and
californium. Nevertheless, it seems worthwhile to outline some of
the general procedures involving carriers, and their combinations with
ion exchange procedures which have been successfully used.-24-
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Thompson, S. G.; Harvey, B. G.; Choppin, G. R. & Seaborg, G. T. Chemical Properties of Elements 99 and 100, report, July 23, 1954; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc1023183/m1/24/: accessed April 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.