Abstract
Abstract
 This work represents the potential impact of geological deposition conditions on the durability of glass used for radioactive waste disposal. The durability of highly radioactive glass could be influenced by iron mineral compositions or other near field parameters inside the final disposal repository. In this paper, silicate sorption by natural ankerite is experimentally studied. Preliminary study using the graphite furnace atomic absorption method to measure the change in concentrations of silicon in standard solution in the presence of natural ankerite was performed. All standard solutions were diluted from a saturated silicate stock solution. Natural ankerite mineral samples which were collected from Rudabánya, Hungary, showed strong sorption of (H4SiO4) on their interface. Batch experiments containing specific masses of natural ankerite and silicate solution were carried out in order to illustrate a better understanding of silicate reduction in solution due to the sorption mechanism of ankerite, evidence that ankerite has the ability to uptake silicate was seen. The desorption of adsorbed silicate was tested and it was noticed that only very small amounts of silicate returned to the solution showed tiny reversed concentrations of silicate which may an indication of chemisorption.
Highlights
Nuclear power plants are the largest in number among all nuclear facilities and produce the greatest volume of radioactive wastes
A Varian AA6 AAS instrument and Perkin Elmer HGA500 graphite furnace GF-AAS instrument were chosen for the primary measurement of silicate sorption by ankerite from the standard silicate solution, Surface areas to Volume ratio (S/V) calculations in Table 3 were done on 10 ml volume of silicate standard solution in each reactor vessel
The current study focused on Si sorption factor and results show strong adsorption capacity of Si by ankerite. 86–99 % of Si molecules were absorbed from the solution Fig. 2
Summary
Nuclear power plants are the largest in number among all nuclear facilities and produce the greatest volume of radioactive wastes. Previous studies predicted influence of ankerite on durability of glass used for disposal of high level nuclear waste [8, 11, 12]. 2.2 Silica gel This work is a representative study that illustrates the potential impact of geological deposition conditions on the durability of the glass used for radioactive waste disposal. This glass could be influenced by iron mineral compositions or other parameters expected to delay the creation of the protective gel layer in unsaturated silica solutions. Delaying Si saturation is attributed to many reasons, iron minerals activities in the aqueous medium were
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
