By P N Paleĭ; D I Ri︠a︡bchikov; Mark Moiseevich Seni︠a︡vin; Institut geokhimii i analiticheskoĭ khimii im. V.I. Vernadskogo
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Additional resources for Analytical chemistry of uranium
Finally, it should be noted that all the methods that rely on mass difference, mass ratio, or kinetics to separate U-235 from U-238 will also lead to enrichment of U-234 (even to greater relative extent than U-235). Elevated levels of U-234 may complicate the utilization of the enrichment product. Similarly, use of reprocessed uranium that contains U-236 (and perhaps some U-232) may also affect the product quality. On the other hand, laser isotope separation methods will selectively enrich U-235 with only very slight changes in the U-234 and U-236 content.
12). This is further discussed in Chapter 2. Reprocessing is especially controversial due to technical, economic, and strategic (proliferation-related) issues. The technical problems arise mainly from the presence of the unnatural uranium isotopes (236U and 232U) in reprocessed uranium (RepU) that may affect the neutron economy in the reactor. 232U in particular is highly radioactive and complicates handling of fuel produced from RepU. Re-enrichment of RepU would further increase the fraction of 232U aggravating the problem.
U3O8 is formed by oxidation of many uranium compounds like UO2, uranium salts, and metallic uranium when heated in air (dry or moist) above 800°C–900°C or when UO3 loses oxygen upon heating above 500°C. The reactions of U3O8 with dilute sulfuric and hydrochloric acids are slow even upon heating, but addition of an oxidizing agent like nitric acid or hydrogen peroxide accelerates dissolution. Alkaline solutions do not affect U3O8 and carbonate solutions selectively leach the hexavalent components (Galkin 1966).
Analytical chemistry of uranium by P N Paleĭ; D I Ri︠a︡bchikov; Mark Moiseevich Seni︠a︡vin; Institut geokhimii i analiticheskoĭ khimii im. V.I. Vernadskogo