While the quantification of uranium is therefore demanding in the diluted sample, uranium isotope ratio determination requires the ultimate in instrumental performance as good precisions for large isotope ratios are required at low concentrations. The abundances of the three naturally occurring U isotopes are shown in Table 1, together with the 234U/238U and 235U/238U ratios. The nuclear indust...

BACKGROUND The deleterious impact of uranium on human health has been linked to its radioactive and heavy metal-chemical properties. Decades of research has defined the causal relationship between uranium mining/milling and onset of kidney and respiratory diseases 25 years later. OBJECTIVE We investigated the hypothesis that uranium, similar to other heavy metals such as cadmium, acts like es...

Uranium is ubiquitously found in drinking water and food. The gastrointestinal tract absorption fraction (f(1)) is an important parameter in risk assessment of uranium burdens from ingestion. Although absorption of uranium from ingestion has been studied extensively in the past, human data concerning children and adults are still limited. In a previous study based on measurements of uranium con...

a solid chelating material, 1-(2-pyridy1azo)-2-naphthol (pan) supported on naphthalene provides a rapid and highly selective means of preconcentration of uranium from aqueous solution. uranium is quantitatively retained on this adsorbent in the ph range 9.8-10.7 with a flow rate of 1 ml min . the metal complex was desorbed with 10 ml of 2 m hydrochloric acid and uranium is determined by differe...

Emission spectroscopy has been used for the first time in a spectroscopic study of a family of uranium(IV) halide complexes in non-aqueous media. The room temperature electronic absorption spectra of the simple coordination compounds [Li(THF)4][UX5(THF)] (X = Cl, Br, I), [Et4N]2[UCl6] and UCl4 in THF have been recorded and all transitions assigned with the aid of a comprehensive computational s...

The Erzgebirge ('Ore Mountains') area in the eastern part of Germany was a major source of uranium for Soviet nuclear programs between 1945 and 1989. During this time, the former German Democratic Republic became the third largest uranium producer in the world. The high abundance of uranium in the geological formations of the Erzgebirge are mirrored in the discovery of uranium by M. Klaproth cl...

An electrodeposition technique of low-enriched uranium onto boron-doped diamond (BDD) electrodes for electro-assembling, sequestration, electrowinning (as the electroextraction alternative), and future neutron detection applications has been developed. Our findings through physicochemical characterization an in-depth XPS analysis show that U/BDD system consists a blend oxides with IV, V, VI oxi...

abstract uranium is a natural heavy metal widely dispersed across the earth crust. in many cases due to anthropogenic disturbance, it has been found beyond its natural abundance which resulted in soil-water pollution. the objective of this study was to investigate the capability of iranian natural zeolite clinoptilolite for removal of uranium (vi) from aqueous solutions. in order to optimize re...

Polycrystalline uranium-bearing compounds Y6U1O12, Gd6U1O12, Ho6U1O12, Yb6U1O12, and Lu6U1O12 samples were irradiated with various ions species (300 keV Kr, 400 keV Ne, and 100 keV He) at cryogenic temperature ( 100K), and the microstructures were examined following irradiation using grazing incidence X-ray diffraction and transmission electron microscopy. The pristine samples are characterized...

Solubility profiles of uranium dusts in a uranium recycling plant were determined by performing in vitro solubility tests on breathing zone air samples conducted in all process areas of the processing plant. The recycling plant produces high density shields, closed end tubes that are punched and formed from uranium sheet metal, and high-fired uranium oxide, which is used as a catalyst. The recy...