English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

The solubility product of NaUO 2 PO 4 ·  x  H 2 O was determined in phosphate containing solutions at low pC H+  values in the absence of carbonate and at higher pC H+  values in the presence of carbonate. NaUO 2 PO 4 ·  x  H 2 O exhibited very low solubilities (∼10 −7  M in U) over a broad range of hydrogen ion concentrations, NaNO 3  concentrations and in the absence of added carbonate. Time Resolved Laser Fluorescence Spectroscopy (TRLFS) analysis of non-carbonate solutions outside of the acidic region revealed the presence of complex mixtures of aqueous U(VI) hydroxyl or phosphate species and uranium phosphate nanoparticles. The presence of the nanoparticles made it impossible to accurately calculate a solubility product for NaUO 2 PO 4 ·  x  H 2 O in the absence of carbonate and at higher pC H+  values. Therefore in order to increase the concentration of U(VI) in solution and thereby verify the solubility product calculated from the most acidic samples, we systematically introduced know concentrations of carbonate, which resulted in the formation of U(VI) carbonate complexes. Development of an accurate aqueous thermodynamic model for the aqueous U(VI) carbonate complexes then allowed calculation of a solubility product for NaUO 2 PO 4 ·  x  H 2 O in the higher pH samples which was in good agreement with the values for the more acidic samples.

The solubility product of NaUO 2 PO 4 · x H 2 O determined in phosphate and carbonate solutions