Effect of temperature on the solubility and solid phase stability of zirconium hydroxide
-
T. Kobayashi
,
D. Bach
Summary
The solubility and solid phase stability of zirconium hydroxide was investigated in the acidic pH range after heating the aqueous samples at 50, 70 and 90 ◦C. The solubility measured at room temperature after exposing the batch samples to elevated temperatures for a given period of time significantly decreased with increasing heating periods. The Zr concentrations at given pH after heating at 90 ◦C for 3 weeks are about 5 orders of magnitude lower than the solubility of amorphous zirconium hydroxide (Zr(OH)4(am)) kept at room temperature. Size distributions of the Zr colloidal species after heating were investigated by sequential filtration using different pore-sized membranes, and the contribution of the colloidal species to the solubility was assessed. The TEM images and XRD spectra of the solid phases after heating indicated the agglomeration and crystallization of the initial amorphous hydroxide solid phase. The solid phase was identified as crystalline oxide after heating at 90◦C. The solubility product determined from the solubility data excluding contributions of colloidal species is correlated to the particle size of the solid phase.
© 2013 Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München
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Artikel in diesem Heft
- Inhalt
- Cross-sections of 45Sc(n, 2n)44m,gSc reaction from the reaction threshold to 20 MeV
- Fast neutron spectrum unfolding of a TRIGA Mark II reactor and measurement of spectrum-averaged cross sections: integral tests of differential cross sections of neutron threshold reactions
- Determination of 234U and 238U in seawater samples by alpha spectrometry after concentration of U(VI) onto hydrotalcite and co-precipitation with LaF3
- Substitution of IO3 −, IO4−, SeO3 2−, and SeO42− for CO32− in Na4[UO2(CO3)3]
- Structure and spectroscopy of uranyl salicylaldiminate complexes
- A comparison between the chemical behaviour of lead-gold and lead-bismuth eutectics towards 316L stainless steel
- Effect of temperature on the solubility and solid phase stability of zirconium hydroxide
- Purification of selenium from thorium, uranium, radium, actinium and potassium impurities for low background measurements
- Analysis of long-lived radionuclides produced by proton irradiation in lead targets – γ -measurements
- Feasibility studies for production of 89Sr in the Fast Breeder Test Reactor (FBTR)
- Synthesis of I-131 labelled iodine species relevant during severe nuclear accidents in light water reactors
