Original scientific paper

Precipitation and Solubility of Uranyl - Orthophosphates. I. Heterogeneous Equilibria in Solutions of: U02(NOa)2 - HaP04

N. Pavković ; Department of Physical Chemistry, Institute »Ruder Boskovic«
M. Branica ; Laboratory of Physical Chemistry, Faculty of Science, University of Zagreb, Zagreb, Croatia, Yugoslavia
B. Težak ; Laboratory of Physical Chemistry, Faculty of Science, University of Zagreb, Zagreb, Croatia, Yugoslavia

Abstract

The precipitation and dissolution of uranium(VI) from aqueous
solutions of orthophosphoric acid (2 X 10-a to 6 M) and uranyl
nitrate (3 X 10- 5 to 0.5 M) has been investigated by turbidimetric
and chemical analyses, fluorescent and electron microscopy. The
concentration ranges where (U02 )g(P04 h and U02HP04 precipitates
were observed 24 hours and 30 days after mixing are represented
by typical precipitation bodies. The morphology of the precipitated
particles is shown by electron micrographs. At equilibrium
conditions (U02)a(P04 ) 2 is stable at concentrations of total phosphate
in the mother liquor lower than 1.5 X 10-3 M. At total phosphate
concentrations higher than 5 X 10- 3 M, U02 HP0 1 is stable.

Keywords

Hrčak ID:

208039

URI

https://hrcak.srce.hr/208039

Publication date:

25.10.1968.

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