Tris uranium

Ion Excha.nge, The recovery of uranium from leach solutions using ion exchange is a very important process (42). The uranium(VI) is selectively adsorbed to an anion-exchange resin as either the anionic sulfato or carbonato complexes. In carbonate solutions, the uranyl species is thought to be the tris carbonato complex, U02(C03) 3 [24646-13-7] and from sulfate solutions the anion is likely to be U02(S0 , where nis ) [56959-61-6] or 2 [27190-85-8], The uranium is eluted from the resin with a salt or acid solution of 1 AfMCl or MNO (M = H", Na", The sulfate solution is... 

White, D.A., Fathurrachman, Extraction of uranium (VI) and uranium (IV) from hydrochloric acid using tri-n-octylamine in a benzene diluent, Hydrometallurgy, v.36, pp. 161-168, 1994. 

Tri-n-butyl phosphate, ( -C4H9)3P04. This solvent is useful for the extraction of metal thiocyanate complexes, of nitrates from nitric acid solution (e.g. cerium, thallium, and uranium), of chloride complexes, and of acetic acid from aqueous solution. In the analysis of steel, iron(III) may be removed as the soluble iron(III) thiocyanate . The solvent is non-volatile, non-flammable, and rapid in its action. 

Uranium. tetrathiocyanatotetrakis[tris-(dimethylamino)phosphine oxide]-structure, 1.87 Uranium carbide nuclear fuels dissolution, 6, 928 Uranium complexes, 3,1131-1215 carbamic acid... 

Reactions of UCI4 with [Li RC(NCy)2 (THF)]2 (R = Me, Bu ) in THF gave the tris(amidinate) compounds [RC(NCy)2]3UCl that could be reduced with lithium powder in THF to the dark-green homoleptic uranium(lll) complexes [RC(NCy)2]3U. Comparison of the crystal structure of [MeC(NCy)2]3U with those of the lanthanide analog showed that the average U-N distance is shorter than expected from a purely ionic bonding model. ... 

Fernandez-Gonzales et al. [16] described a method for determination of OTC in medicated premixes and feeds by second-derivative synchronous spectrofluorome-try. The assay based on the reaction of oxytetracycline with divalent metal ion (Ca2+) at pH 6-10 to form a yellow complex that can be analyzed by synchronous spectrofluorometry (AX = 115 nm). Rao et al. [17] described a spectrophotometric method for the determination of OTC in pharmaceutical formulations based on the color reaction with uranium, which was detected at 413 nm. 

Newton and Van den Berg [31] applied cathodic stripping chronopotentiome-try with continuous flow to the determination of nanomolar concentrations of nickel cobalt, copper, and uranium in estuary water. 

Purex [Plutonium and uranium recovery by extraction] A process for the solvent extraction of plutonium from solutions of uranium and fission products, obtained by dissolving spent nuclear fuel elements in nitric acid. The solvent is tri-n-butyl phosphate (TBP) in... 

Thorex [Thorium extraction] A process for separating the products from the nuclear breeder reaction in which uranium-233 is produced by the neutron bombardment of thorium-232. It uses solvent extraction into tri-n-butyl phosphate. Developed at the Oak Ridge National Laboratory, TN, in the early 1960s. See also Butex, Purex, Redox. 

Triscarbonato uranium(VI) solids, 25 432 Tris-Cp uranium complexes, 25 440 2,4,6-Tris(dimethylaminomethyl)phenol (TDMAMP), 10 412... 

We have already met the concept of error propagation a few times when dealing with the change of variable formulas for probability distribution, but let us try to illustrate it with a simple example. We want to measure the diffusion coefficient Q) of uranium in a glass by maintaining at a specific temperature and for a specific time t the surface of one long glass rod in contact with a concentrated solution of uranium. We admit without further justification (see Section 8.5) that the depth x of uranium... 

Tricyclopentadienyluranium tetrahydroalmninate, 3688 N. /V.4-Trilithioanilinc. 2180 Triphenylmethylpotassium, 3781 Tris(cyclopentadienyl)cerium, 3683 Tris(cyclopentadienyl)plutonium, 3 684 Tris(cyclopentadienyl)uranium, 3685... 

Fig. 5. Tris-aryloxide triazacyclononane ligand for uranium coordination chemistry.

The first successful isolation of a mononuclear uranium-tacn complex was achieved by treatment of the free l, 7-tris(3,5-di-fert-butyl-2-hydroxybenzyl)-1,4,7-triazacyclononane (( ArOH)3tacn) (4 - ) (25) with one equivalent of [U(N(SiMe3)2)3] (35) in cold pentane... 

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