Original scientific paper

Precipitation and Hydrolysis of Uranium(VI) in Aqueous Solutions: Uranyl Nitrate-Potassium Hydroxide-Neutral Electrolyte

B. Tomažić ; Department of Physical Chemistry, I nstitute »Ruder Boskovic « and Laboratory of Phy sical Chemistry, Faculty of Science, U niversity of Zagreb, Zagreb , Croatia, Yugoslavia
M. Branica ; Department of Physical Chemistry, I nstitute »Ruder Boskovic « and Laboratory of Phy sical Chemistry, Faculty of Science, U niversity of Zagreb, Zagreb , Croatia, Yugoslavia
B . Težak ; Department of Physical Chemistry, I nstitute »Ruder Boskovic « and Laboratory of Phy sical Chemistry, Faculty of Science, U niversity of Zagreb, Zagreb , Croatia, Yugoslavia

Abstract

The precipitation and hydrolys•is of uranium (VI) in aqueous
solutions of uranyl nitrate - potassium hydroxide - neutral electrolyte,
was investigated. Clear and stable systems of uranyl nitrate
and potassium hydroxide, were studied , in equivalent concentration
of 2 x 10-3 N. The pH value, of the mentioned system was between
5 and 6. By addition of neutral electrolytes (potassium, calcium,
strontium, barium, yttrium, and la ntanum nitrate) the precipitation
process was initiated and up to 700/o of the uranium present was
precipitated. The experimental results showed, that the precipitation of
uranium (VI) , in the observed system, was accomplished by several
mechanisms, i. e. hydrolysis, coagulation, and formation of mixed
uranates.

Keywords

Hrčak ID:

208418

URI

https://hrcak.srce.hr/208418

Publication date:

15.5.1962.

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