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Uranium Compounds (1):
Recent article
Uranium Compounds
Abstract
To determine whether Paducah Gaseous Diffusion Plant workers had mortality patterns that differed from the general US population and to investigate whether mortality patterns were associated with job title or workplace exposures.
A retrospective occupational cohort mortality study was conducted on 6...
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PMID: 20595915
PDF is available here.
PDF is available here.
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Chemical Communications (46)18 2010
Abstract
The low-valent U(III) complexes [((t-BuArO)3mes)U] and [((AdArO)3N)U] react with CO2 to form the bridging carbonate complexes [{((t-BuArO)3mes)U}2(mu-kappa2:kappa2-CO3)] and [{((AdArO)3N)U}2(mu-eta1:kappa2-CO3)]. Uranium(IV) bridging oxo complexes have been determined to be the intermediate in these...
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PMID: 20361104
PDF is available here.
PDF is available here.
Inorganic Chemistry (49)8 2010
Abstract
Bimolecular reactions of uranium oxide molecular anions with methanol have been studied experimentally, by Fourier transform ion cyclotron resonance mass spectrometry, and computationally, by density functional theory (DFT). The primary goals were to provide fundamental insights into mechanistic and...
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PMID: 20235584
PDF is available here.
PDF is available here.
Abstract
The form of solid phase U after Fe(II) induced anaerobic remineralization of ferrihydrite in the presence of aqueous and absorbed U(VI) was investigated under both abiotic batch and biotic flow conditions. Experiments were conducted with synthetic ground waters containing 0.168 mM U(VI), 3.8 mM carb...
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PMID: 19848151
PDF is available here.
PDF is available here.
Abstract
We use solubility and drop-solution calorimetry measurements to determine the thermodynamic properties of the uranyl phosphate phases autunite, uranyl hydrogen phosphate, and uranyl orthophosphate. Conducting the solubility measurements from both supersaturated and undersaturated conditions and unde...
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PMID: 19848155
PDF is available here.
PDF is available here.
Abstract
We conclude that structuralincorporation of Mn(II) into uraninite has an important stabilizing effect leading to the prediction that other groundwater solutes may similarly stabilize biogenic uraninite....
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PMID: 19764214
PDF is available here.
PDF is available here.
Abstract
Stirred-flow cell experiments were performed to investigate the kinetics of uranyl [U(VI)] desorption from a contaminated sedimentcollected from the Hanford 300 Area at the U.S. Department of Energy Hanford Site, Washington. Three influent solutions of variable pH, Ca and carbonate concentrations th...
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PMID: 19764217
PDF is available here.
PDF is available here.
Abstract
We examine the sorption mechanism and propensity for release of uranium reacted with Fe (hydr)oxides under cyclic oxidizing and reducing conditions. Upon reaction of ferrihydrite with Fe(II) under conditions where aqueous Ca-UO2-CO3 species predominate (3 mM Ca and 3.8 mM total CO3), dissolved urani...
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PMID: 19673286
PDF is available here.
PDF is available here.
Abstract
Samples of the secondary uranium minerals collected in the abandoned uranium mine at Pecs (Hungary) were investigated by two micro-techniques: scanning electron microscopy (SEM/EDX) and micro-Raman spectroscopy (MRS). They were applied to locate U-rich particles and identify the chem...
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PMID: 19329250
PDF is available here.
PDF is available here.
Radiation Research (171)6 2009
Abstract
Our study showed a weak association between internal uranium dose estimated from urinalysis results and multiple myeloma risk: OR = 1.04 (95% CI 1.00-1.09) at 10 microGy with the inclusion of other risk factors. The parameter estimates and the corresponding odds ratios were very similar when interna...
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PMID: 19580470
PDF is available here.
PDF is available here.
Abstract
Ionic liquids in a dispersive liquid-liquid microextraction technique were used for determination of lanthanoids such as samarium, europium, gadolinium, and dysprosium in uranium dioxide powder. In this process, an appropriate mixture of extraction solvent and disperser is rapidly injected into an a...
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PMID: 19368197
PDF is available here.
PDF is available here.
Abstract
The new M06 functional of Truhlar and co-workers is found to be competitive with high level ab initio methods in the study of the water exchange mechanism of the [UO(2)(OH(2))(5)](2+) ion, and of the redox potentials of the aqua complexes of [AnO(2)](2+) (An = U, Np and Pu).
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PMID: 19209355
PDF is available here.
PDF is available here.
Abstract
We have investigated nanoparticles sampled from the far-field at the Nevada Test Site, Nevada, utilizing advanced electron microscopytechniques, including high-angle annular dark-field scanning TEM (HAADF-STEM). Fissiogenic elements: Cs, rare earth elements (REE), activation elements: Co; and actini...
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PMID: 19350893
PDF is available here.
PDF is available here.
Abstract
Complexes of the uranyl cation [UO(2)(2+)] with histidine (His), N-acetyl-histidine (NAH), tyrosine (Tyr), and N-acetyl-tyrosine (NAT) were studied by UV-visible and NMR spectroscopy, and by potentiometric titration. Protonation constants for each ligand are reported, as are cumulative formation con...
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PMID: 18947879
PDF is available here.
PDF is available here.
Biophysical Journal (95)10 2008
Abstract
We have performed complementary experiments using antibody PHE03S, raised against uranyl-DCP but, presenting a strong cross-reactivity toward the DCP chelator. This work allowed us to obtain a reallocation of the respective contributions of the metal ion itself and that of the chelator. Results led...
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PMID: 18790844
PDF is available here.
PDF is available here.
Abstract
Colorimetric uranium sensors based on uranyl (UO2(2+)) specific DNAzyme and gold nanoparticles (AuNP) have been developed and demonstrated using both labeled and label-free methods. In the labeled method, a uranyl-specific DNAzyme was attached to AuNP, forming purple aggregates. The presence of uran...
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PMID: 18837498
PDF is available here.
PDF is available here.
Abstract
The stability of biogenic uraninite with respect to oxidation is seminal to the success of in situ bioreduction strategies for remediation of subsurface U(VI) contamination. The properties and hence stability of uraninite are dependent on its size, structure, and composition. In this study, the loca...
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PMID: 19031878
PDF is available here.
PDF is available here.
ChemPhysChem (9)15 2008
Abstract
ChemPhysChem (9)15 2008
Abstract
Abstract
Methods for the fractionation of aquatic colloids require careful application to ensure efficient, accurate and reproducible separations. This paper describes the novel combination of mild colloidal fractionation and characterisation methods, namely centrifugal ultrafiltration, gel electrophoresis a...
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PMID: 18635249
PDF is available here.
PDF is available here.
Abstract
The retention profile of uranium (VI) as uranyl ions (UO(2)(2+)) from the aqueous media onto the solid sorbent date pits has been investigated. The sorption of UO(2)(2+) ions onto the date pits was achieved quantitatively (98+/-3.4%, n=5) after 15 min of shaking at pH 6-7. The sorption of UO(2)(2+)...
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PMID: 18761152
PDF is available here.
PDF is available here.
Science of the Total Environment (403)1-3 2008
Abstract
Phosphogypsum (PG), a by-product of the phosphate fertiliser industries, has been applied as soil amendment to reduce Na saturation in soils, as in the reclaimed marsh area from SW Spain, where available PG has a typical fingerprint of 710+/-40 Bq kg(-1) of (226)Ra, 165+/-15 Bq kg(-1) of (238)U and...
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PMID: 18602676
PDF is available here.
PDF is available here.
Toxicology (250)1 2008
Abstract
Our results also illustrate the importance of a strictly controlled speciation of the metals in toxicological studies....
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PMID: 18606205
PDF is available here.
PDF is available here.
Abstract
The chemical stability of biogenic UO2, a nanoparticulate product of environmental bioremediation, may be impacted by the particles' surface free energy, structural defects, and compositional variability in analogy to abiotic UO(2+x) (0 < or = x < or = 0.25). This study quantifies and compares intri...
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PMID: 18754482
PDF is available here.
PDF is available here.
Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment and General Theory (112)26 2008
Abstract
Theoretical calculations suggest a novel two-electron three-atom bonding scheme for complexation of O 2 with U(V) compounds, leading to the stabilization of superoxo complexes in the side-on (eta (2)) configuration. This binding motif is likely to play an important role in the oxidative processes in...
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PMID: 18540589
PDF is available here.
PDF is available here.
Chemosphere (72)6 2008
Abstract
We used the BCR sequential extraction scheme to determine the partitioning of DU amongst soil fractions of texturally varying soils from locations affected by weapons-testing activities. Isotopic analyses (MC-ICP-MS and alpha-spectrometry) were performed to verify the presence of DU in whole soils a...
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PMID: 18457863
PDF is available here.
PDF is available here.
Abstract
We studied the speciation of U after accumulation in NRK-52E kidney cells. U speciation was first identified in various exposure media, containing citrate or not, in which U was supplied as U carbonate. The influence of serum proteins was analyzed in order to detect the formation of macromolecular c...
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PMID: 18273650
PDF is available here.
PDF is available here.
Abstract
We propose that the initial electron transfer step from the heme is to a cation-cation complex in the case of D. acetoxidans, but for G. sulfurreducens, it is to a single uranyl cation, which then forms a U(V)-U(VI) complex with a second uranyl cation. For both enzymes, the subsequent catalytic path...
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PMID: 18386882
PDF is available here.
PDF is available here.
Abstract
By incorporating uranium chelating agents, we developed new supramolecular hydrogels that could effectively and conveniently decorporate uranium ions from the contaminated wound sites of mice, with the highest efficacy achieved by our pamidronate-based molecular hydrogel....
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PMID: 18464065
PDF is available here.
PDF is available here.
Abstract
Our results show that the functional diversity of populations capable of U(VI) reduction is dependent upon the choice of electron donor....
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PMID: 18378664
PDF is available here.
PDF is available here.
Analyst (Cambridge UK) (133)5 2008
Abstract
Detection of radiological materials in the solution phase is restricted by conventional radiation-counting techniques owing to extreme attenuation. Chemical sensing of the resultant radiological species such as uranyl UO(2)(2+) is possible on the surface of a plastic or glass fibre optic. A dihydrox...
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PMID: 18427682
PDF is available here.
PDF is available here.
Abstract
In order to better evaluate the consequences of an accidental release of heavy gas, such as uranium hexafluoride (UF(6)), in some installations in the nuclear fuel cycle, an experimental and numerical study was conducted by IRSN on heavy gas dispersion in a ventilated room. This study was based on a...
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PMID: 17804157
PDF is available here.
PDF is available here.
Abstract
Th(NO(3))(4).5H(2)O reacts with H(2)pyr(2)pen {propylenediamine-bis(pyridoxylideneimine)}, UO(2)(NO(3))(2).6H(2)O reacts with H(2)pyr(2)pen and H(2)pyr(2)dien {diethylenetriamine-bis(pyridoxylideneimine)} under deprotonation of the endo hydroxyl groups of the Schiff bases rings to give the chelate c...
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PMID: 18068803
PDF is available here.
PDF is available here.
Abstract
The synthesis of an isoamethyrin derivative containing two CH(2)CH(2)CO(2)CH(3) moieties in the beta-pyrrolic positions and its use in the colorimetric detection of the uranyl cation after immobilization onto a solid support is reported.
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PMID: 18335135
PDF is available here.
PDF is available here.
Abstract
The formation of and stability constants for aqueous Mg-UO2-CO3 complexes were determined using an anion exchange method. Magnesium concentration was varied (up to 20 mmol/L) at constant ionic strength (I = 0.101, 0.202, 0.304, 0.406, and 0.509 mol/kg NaNO3), pH 8.1, total [U(VI)] = 10.4 micromol/L...
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PMID: 18409624
PDF is available here.
PDF is available here.
Journal of Hazardous Materials (151)2-3 2008
Abstract
Chitosan (Ch) was entrapped in polyacrylamide (PAA) by direct polymerization of acrylamide in a suspension of Ch. The adsorptive features of PAA-Ch and Ch were then investigated for Pb2+, UO2(2+), and Th4+ in view of dependency on ion concentration, temperature, and kinetics. Additional consideratio...
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PMID: 17629399
PDF is available here.
PDF is available here.
Abstract
We raised specific mAbs against UO2(2+)-DCP-BSA (DCP, 1,10-phenanthroline-2,9-dicarboxylic acid) to generate new sets of antibodies that might cross-react with various complexed forms of uranyl in different environments for further application in the field of toxicology. Using counter-screening with...
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PMID: 18154273
PDF is available here.
PDF is available here.
Health Physics (94)2 2008
Abstract
Although human experience with uranium spans more than 200 years, the LD50 for acute intake in humans has not been well established. Large acute doses of uranium can produce death from chemical toxicity in rats, guinea pigs, and other small experimental animals, with variation in sensitivity among s...
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PMID: 18188051
PDF is available here.
PDF is available here.
Abstract
The reaction of UI3 and KCpRR' (CpRR' = pentamethylcyclopentadienyl, trimethylsilylcyclopentadienyl or tetramethylcyclopentadienyl) in diethyl ether results in the two-electron reduction of the solvent to form trimetallic, mixed valence uranium oxo species.
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PMID: 18401896
PDF is available here.
PDF is available here.
Journal of Fluorescence (18)3-4 2008
Abstract
We followed the coordination capacity of the uranyl ion (UO2(2+)) with a series of Schiff bases. The Schiff bases have been obtained through the condensation of some salicylic aldehyde derivates with a series of diamines. As a result of the reaction between these substances and the uranyl ions the m...
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PMID: 18283536
PDF is available here.
PDF is available here.
Abstract
These results showed similar relationships with SEM-wavelength dispersive spectroscopy (WDS) mapping of this material. It is noteworthy that Area 1 geological material has not been as aggressively weathered as Area 3 material due to its physical location from the waste source. In all of the cores, m...
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PMID: 18075070
PDF is available here.
PDF is available here.
Abstract
Ternary Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and UO(2)(II) chelates with tenoxicam (Ten) drug (H(2)L(1)) and dl-alanine (Ala) (HL(2)) and also the binary UO(2)(II) chelate with Ten were studied. The structures of the chelates were elucidated using elemental, molar conductance, magnetic moment, IR...
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PMID: 17317287
PDF is available here.
PDF is available here.
Abstract
Uranyl Schiff base complex [(UO(2))(2)(Salpro)(OH)(Solvent)(2)] (1) in the presence of excess of ethylenediamine (EDA) does not undergo nucleophilic addition (hydrolysis) and substitution (transamination) reactions due to an extended chelation [2N, 3O + OH] by the flexible backbone.
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PMID: 17912397
PDF is available here.
PDF is available here.
Abstract
Raman spectra at 298 and 77K and infrared spectra of the uranyl sulfate mineral zippeite from Jáchymov (Joachimsthal), Czech Republic, K(0.6)(H(3)O)0.4[(UO(2))6(SO(4))3(OH)7].8H2O, were studied. Observed bands were tentatively attributed to the (UO(2))2+ and (SO(4))2- stretching and bending vibrati...
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PMID: 17113344
PDF is available here.
PDF is available here.
Abstract
We have used a complex methodological approach involving advanced solid state speciation and scanning electron microscopy to study the ability of saprotrophic, ericoid and ectomycorrhizal fungi to transform these model oxides. This study has revealed that fungi exhibit a high uranium oxide tolerance...
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PMID: 17564604
PDF is available here.
PDF is available here.
Abstract
Radiological assessments have assumed that the mass of irradiated uranium oxide particles inadvertently released to the atmosphere from the Windscale Piles, two nuclear reactors at Windscale Works, Sellafield, England, during the 1950s was 20 kg. This paper re-examines the assumptions upon which thi...
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PMID: 17664659
PDF is available here.
PDF is available here.
Abstract
We determined the cytotoxicity and clastogenicity of both particulate (water-insoluble) and soluble DU in human bronchial fibroblasts (WTHBF-6 cells). We used uranium trioxide (UO3) and uranyl acetate (UA) as prototypical particulate and soluble DU salts, respectively. After a 24 h exposure, both UO...
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PMID: 17432880
PDF is available here.
PDF is available here.
Abstract
The objective of this work was investigation of possibility of tunable diode laser spectroscopy (TDLS) technique application for gaseous uranium hexafluoride (UF6) isotope measurement. Spectra of uranium hexafluoride gas mixture were investigated using two different Fourier Transform Spectrometers V...
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PMID: 17142093
PDF is available here.
PDF is available here.
Abstract
Raman spectroscopy at 298 and 77 K of bergenite has been used to characterise this uranyl phosphate mineral. Bands at 995, 971 and 961 cm-1 (298 K) and 1006, 996, 971, 960 and 948 cm-1 (77K) are assigned to the nu1(PO4)3- symmetric stretching vibration. Three bands at 1059, 1107 and 1152 cm-1 (298 K...
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PMID: 16876471
PDF is available here.
PDF is available here.
Analytica Chimica Acta (587)2 2007
Abstract
Uranyl ion-imprinted polymeric (IIP) resins were prepared by dissolving stoichiometric amounts of uranyl nitrate and selected chelating ligands, viz. salicylaldoxime, catechol, succinicacid, 5,7-dichloroquinoline-8-ol and 4-vinyl pyridine in 2-methoxy ethanol (porogen) and copolymerizing thermally i...
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PMID: 17386782
PDF is available here.
PDF is available here.
Abstract
We determined the extent to which the iron binding sites might accommodate the peculiar topographic profile of the uranyl ion and the consequences of its binding on protein conformation. Indeed, metal intake via endocytosis of the transferrin/transferrin receptor depends on the adequate coordination...
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PMID: 17266333
PDF is available here.
PDF is available here.
Abstract
Detailed equilibrium binding studies were conducted on a monoclonal antibody (8A11) directed against UO22+ complexed with 2,9-dicarboxy-1,10-phenanthroline (DCP-UO22+). Covalent modification of 8A11 with amine-reactive derivatives of Cy5 or Alexa 488 altered the binding curves obtained with DCP-UO22...
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PMID: 17279622
PDF is available here.
PDF is available here.
Environmental Toxicology (22)1 2007
Abstract
The influence of phosphate on the toxicity of uranium to Lemna gibba G3 was tested in semicontinuous culture with synthetic mine water developed as an analogue of surface water of two abandoned uranium mining and ore processing sites in Saxony, Germany. Six concentrations of uranium were investigate...
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PMID: 17295276
PDF is available here.
PDF is available here.
Abstract
These results clearly demonstrate that imidazole binds to uranyl and suggest that binding of histidine residues to uranyl could occur under normal biological conditions....
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PMID: 17227015
PDF is available here.
PDF is available here.
Abstract
A method for determining the specific alpha activity of thick sources using a large area ZnS(Ag) scintillation detector is presented. In this method a quadratic relationship between the detector response and window thickness is assumed. This method provides a quick estimation of alpha activity in th...
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PMID: 17383779
PDF is available here.
PDF is available here.
Abstract
We have generated the histogram of unbinding events with respect to the composite stiffness of the complex between the protein and the uranyl compound. Combining the model of Bell and Evans with that of Williams, we have estimated the number of parallel bonds involved in the unbinding process and de...
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PMID: 18080996
PDF is available here.
PDF is available here.
Abstract
An experimental, non-destructive in-pool, method for measuring fission gas release (FGR) in irradiated nuclear fuel has been developed. Using the method, a significant number of experiments have been performed in-pool at several nuclear power plants of the BWR type. The method utilises the 514 keV g...
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PMID: 16949295
PDF is available here.
PDF is available here.
Annali di Chimica (97)3-4 2007
Abstract
The formation constants of dioxouranium(VI)-1,2,3-propanetricarboxylate [tricarballylate (3-), TCA] complexes were determined in NaCl aqueous solutions at 0 < or = I/mol L(-1) < or = 1.0 and t=25 degrees C, by potentiometry, ISE-[H+] glass electrode. The speciation model obtained at each ionic stren...
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PMID: 17822225
PDF is available here.
PDF is available here.
Abstract
Abolishing the threat of nuclear war requires the outlawing of nuclear weapons and dismantling current nuclear weapon stockpiles, but also depends on eliminating access to fissile material (nuclear weapon fuel). The near-universal use of weapons-grade, highly enriched uranium (HEU) to produce radiop...
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PMID: 17987979
PDF is available here.
PDF is available here.
Abstract
We have developed an organic-phase synthesis method for producing size-controlled, nearly monodispersed, colloidal uranium-dioxide nanocrystals. These UO2 nanocrystals are potentially important to applications such as nuclear fuel materials, catalysts, and thermopower materials. In addition, we have...
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PMID: 17177400
PDF is available here.
PDF is available here.