skip to main content

Title: Effect of Phosphate, Fluoride, and Nitrate on Gibbsite Dissolution Rate and Solubility

Laboratory tests have been completed with simulated tank waste samples to investigate the effects of phosphate, fluoride, and nitrate on the dissolution rate and equilibrium solubility of gibbsite in sodium hydroxide solution at 22 and 40{degrees}C. Results are compared to relevant literature data and to computer model predictions. The presence of sodium nitrate (3 M) caused a reduction in the rate of gibbsite dissolution in NaOH, but a modest increase in the equilibrium solubility of aluminum. The increase in solubility was not as large, though, as the increase predicted by the computer model. The presence of phosphate, either as sodium phosphate or sodium fluoride phosphate, had a negligible effect on the rate of gibbsite dissolution, but caused a slight increase in aluminum solubility. The magnitude of the increased solubility, relative to the increase caused by sodium nitrate, suggests that the increase is due to ionic strength (or water activity) effects, rather than being associated with the specific ion involved. The computer model predicted that phosphate would cause a slight decrease in aluminum solubility, suggesting some Al-PO4 interaction. No evidence was found of such an interaction.
Authors:
 [1]
  1. Washington River Protection Solutions LLC (United States)
Publication Date:
OSTI Identifier:
1119691
Report Number(s):
LAB-RPT--13-00011-Rev.0
TRN: US1400127
DOE Contract Number:
DE-AC27-08RV14800
Resource Type:
Technical Report
Research Org:
HNF (Hanford Site (HNF), Richland, WA (United States))
Sponsoring Org:
USDOE Office of Environmental Management (EM) (United States)
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES