Original scientific paper

Precipitation and Hydrolysis of Thorium in Aqueous Solution. IV. Studies of the Systems: Thorium Nitrate-Sodium Fumarate and Thorium Nitrate-Potassium Maleate

H. Bilinski ; Departments of Physical Chemistry and Solid State, Institute »Ruder Boskovic«, Zagreb, Croatia, Yugoslavia
Z. Despotović ; Departments of Physical Chemistry and Solid State, Institute »Ruder Boskovic«, Zagreb, Croatia, Yugoslavia

Abstract

Precipitation of thorium from aqueous solutions of thorium
nitrate and sodium fumarate and potassium maleate respectively
has been investigated for a broad range of concentrations of preci~
pitation components and pH. From the results of chemical analyses
and from the DT A and IR spectra the most probable formulas of
the formed precipitates are: Th(H-fumarate)2 (0H)2 X 5 H 20 and
[ g~ Thg~ (Mal Th g~ )4] X 6 H20. In the soluble mixed hydroxo
maleato thorium complex, which is in equilibrium with thorium
hydroxide, probably three hydroxide ions are bound to one thorium.
It has been found that with fumarate ion thorium does not form a
soluble complex.

Keywords

Hrčak ID:

208082

URI

https://hrcak.srce.hr/208082

Publication date:

15.10.1967.

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