A Direct High Voltage Electrophoresis Study of⁹⁵Zr in Na₂CO₃-UO₂(NO₃)₂·6H₂O Systems

Uranium Sorption on “Tezontle” Volcanic Rock

“…The separation of uranium species (anionic, cationic, or neutral) from the NO and CO systems was carried out by high voltage electrophoresis [19,20] ) 3 ]) were prepared as described and subsequently diluted to varying concentrations from 1 to 10 µmol/mL. One gram of T was placed in contact with a 20 mL solution of UVI (acidic and basic) in a 25 mL glass tube, and the resulting suspensions were agitated and equilibrated for 24 hours at room temperature.…”

“…A variety of classical and spectroscopic techniques have been used to study aqueous solutions of uranium salts [16][17][18], and the direct room temperature electrophoresis technique has been shown to be highly valuable for determining the extent of ionic complex formation [19,20]. Figure 1 shows the electrophoregram from the basic aqueous uranium system used in the present work.…”

“…2+ are the only significant additional species observed in solution. [19] These considerations led us to propose that the H 2 O-UO 2 (NO 3 ) 2 .6H 2 O system is a mixture of (UO 2 ) 2 (OH 2 ) 2+ , (UO 2 ) 3 (OH) 5 + , and (UO 2 ) 3 (OH) 4 2+ , in which the dominant component is the dimmer. This is in agreement with data reported by Ticknor [9], Cinnéide et al [17], Scanlan [18], and Baes [21].…”

“…Mononuclear uranyl tricarbonate complexes were prepared from a 0.05 M solution of uranyl nitrate hexahydrate and a 0.15 M solution of anhydrous sodium carbonate [19,34], which were mixed at room temperature. The final aqueous solution had a pH of 8.7, and this basic uranyl solution was termed CO.…”