Uranyl with water, reaction

Uranium Peroxide Hydrate. Add a 3% hydrogen peroxide solution dropwise to 5 ml of a 10% uranyl nitrate solution up to complete precipitation. Filter off the product on a small filter, wash it with water, and dry it in a drying cabinet at 70 °C. What is the composition of the product Test the reaction of uranium peroxide hydrate with 10% solutions of acids and alkalies in the cold and when heated. 

Reaction with Water. Uranyl metaborate is virtually insoluble in water at 25°C., but the salt hydrolyzes slowly over several days to form uranyl hydroxide. 

URANIUM NITRATE or URANYL NITRATE (10102-06-4) NjO,U Noncombustible solid radioactive material. A powerful oxidizer accelerates the burning of combustible materials. Violent reaction with many materials reducing agents, including hydrides, nitrides, and sulfides alkyl esters combustible materials, ethers, fuels, organic substances, powdered metals phosphorus tin(II) chloride. Incompatible with cellulose. Reacts with water producing weak solution of nitric acid. Contact with steam may cause explosion. Attacks many plastics, rubber, and coatings. Attacks most metals in the presence of moisture. 

Another often used reaction sequence begins with the formation and precipitation of ammonium uranyl carbonate (AUC) by reaction of UF with water, CO2 and NH3, see Figure 21.2. The AUC is reduced to UO2 by reduction in a fluidized bed using a mixture of hydrogen, nitrogen and steam and cooled to room tenqierature in a mixture of air and nitrogen. 

Uranyl Sulfate — Fire Hazards Flash Point (deg. F) Not flammable Flammable Limits in Air (%) Not flammable Fire Extinguishing Agents Not pertinent Fire Extinguishing Agents Not to be Used Not pertinent Special Hazards of Combustion Products No data Behavior in Fire No data Ignition Temperature (deg. F) Not pertinent Electrical Hazard Not pertinent Burning Rate Not pertinent. Chemical Reactivity Reactivity with Water No reaction Reactivity with Common Materials ... 

The reaction of uranyl salts with 2,2 -bisbenzoxaline gave a seven-co-ordinate species [U02L(H20)], in which L is the ligand (7) L, and the water... 

According to C. F. Barwald and A. Monheim (1835), the decomposition is accelerated by the presence of organic substances. J. Milbauer tried the effect of thirty-two metal chlorides of sodium tungstate and molybdate of uranyl sulphate and of sulphuric, selenic, arsenic, and boric acids on the photo-decomposition of chlorine water, and found. that none accelerated but that most retarded the action. Chlorine catalyzes the decomposition of bromine water and bromine, chlorine water while iodine does not accelerate, but rather retards the reaction, probably by forming relatively stable iodine compounds. A. Bcnrath and H. Tuchel found the temp, coeff. of the velocity of the reaction with chlorine water between 5° and 30° increases in the ratio 1 1 395 per 10°. 

Uranyl Nitrate. Acquaint yourself with the appearance of uranyl nitrate. Find the solubility products of uranyl nitrate in water and ether in a reference book. What is the reaction of solutions of ammonium sulphide, potassium hexacyanoferratefll), and potassium phosphate with a uranyl nitrate solution What is obtained Write the equations of the reactions. 

The bound peroxidase is visualized by reaction with a filtered solution of 0.05% DAB and 0.0005% hydrogen peroxide in PBS. After rinsing with 0.15 M sodium phosphate buffer (pH 7.4), the sections are postfixed with 0.25% osmium tetroxide in the same buffer for 1 hr and counterstained with 1% uranyl acetate in deionized water. The sections are dehydrated and flat-embedded in Epon according to standard procedures (Hayat, 2000a). Controls are processed as above, except that incubation in the absence of the primary antibody is carried out with PBS containing 2% normal serum and 0.015% Triton X-100. 

Other actinide(VI) oxide fluorides exist. The thermal decomposition of UOF4 at 290°C (226) and the reaction of uranyl fluoride with SeF4 (275) yield a yellow solid, which is U203F6. The compound U205F2 is formed as the dihydrate in the U03-HF-H20 system (276) and when UF6 reacts with a small quantity of water, U305F8 is the product (275). 

After taking the sample, the reaction was immediately stopped with 0.1 mL of 0.1 N sodium thiosulphate solution. Copper grids were exposed to 20-p, L samples for 15 min and washed with sterile distilled water. Finally grids were stained in 2% aqueous uranyle acetate for 8 min and dried. The grids were examined with a Zeiss EM 902 transmission electron microscope (LEO Elektronenmikroskopie GmbH). 

Triflates. The synthesis of U02(03SCF3)2(H20) was first reported in 1994, " and involved the treatment of UO3 with triflic acid in water. The molecular structure of the complex U02(03SCF3)2(H20)3 2(15-crown-5) was subsequently reported, " as was the solution spectrum of U02(03SCF3)2(MeCN)3. The metal coordination environment in both complexes are best regarded as pentagonal bipyramidal uranyl units. Anhydrous and solvent free uranyl tiiflate has since been prepared by several routes, but most conveniently by reaction of UO3 with neat tiiflic add or tiiflic anhydride at elevated temperatures. As discussed above, recrystallization of U02(0Tf)2 from pyridine generates the base adduct U02(0Tf)2(py)3. 

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