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The Precipitation of Rubidium and Ceasium with Silicotungstic Acid

P . Strohal ; Institute »Ruder Boskovic«, Zagreb, Croatia, Yugoslavia
Đ. Letić ; Institute »Ruder Boskovic«, Zagreb, Croatia, Yugoslavia
J. Tuta ; Institute »Ruder Boskovic«, Zagreb, Croatia, Yugoslavia

Puni tekst: engleski pdf 7.530 Kb

str. 205-213

preuzimanja: 150



The precipitation· of rubidium and ceasium with silicotungstic
a cid has been stu died w ith the aim of investigating such processes
as a possible separation method. The influence of hydrochloric acid,
ammonium chloride, and the aging of the precipitates was investigated.
The results show that there are diffe rences in the
precipitation of rubidium and ceasium with s ilicotungstic acid.
When accompanying ceasium, rubidium was found even in precipitates
under such experimental conditions for which it would not
precipitate itself. The results also indicate that precipitates formed
in the low concentration region of h ydrochloric acid are salts either
of rubidium or ceasium silicotungstate. At higher acid concentrations
there is a higher precipitation yield. This is due to the contributions
from two processes: precipitation and co -precipitation** . At higher
hydrochloric a cid concentrations, the precipitation of rubidium
or ceasium silicotungstate is followed by co-precipitation of rubidium
and ceasium. It is shown that rubidium can be removed
from rubidium-ceasium silicotungstates by an exchange reaction.

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