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https://www.readbyqxmd.com/read/29054627/influence-of-diet-in-urinary-levels-of-metals-in-a-biomonitoring-study-of-a-child-population-of-the-valencian-region-spain
#1
Rosa Pérez, Eva Doménech, Andrea Conchado, Alfredo Sanchez, Clara Coscollà, Vicent Yusà
Pollution by trace elements and its possible effect on organisms has become a worldwide concern due to the increasing presence of trace elements in the environment and especially in the food chain. Exposure to chemicals has traditionally been measured using environmental samples, however, human biomonitoring brings a different perspective, in which all sources and exposure pathways are integrated. The objective of this paper is to discern the possible relationship between children's diet and the metals found in children urine...
October 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29050665/uranium-bioreduction-and-biomineralization
#2
Rehemanjiang Wufuer, Yongyang Wei, Qinghua Lin, Huawei Wang, Wenjuan Song, Wen Liu, Daoyong Zhang, Xiangliang Pan, Geoffrey Michael Gadd
Following the development of nuclear science and technology, uranium contamination has been an ever increasing concern worldwide because of its potential for migration from the waste repositories and long-term contaminated environments. Physical and chemical techniques for uranium pollution are expensive and challenging. An alternative to these technologies is microbially mediated uranium bioremediation in contaminated water and soil environments due to its reduced cost and environmental friendliness. To date, four basic mechanisms of uranium bioremediation-uranium bioreduction, biosorption, biomineralization, and bioaccumulation-have been established, of which uranium bioreduction and biomineralization have been studied extensively...
2017: Advances in Applied Microbiology
https://www.readbyqxmd.com/read/29040789/a-review-of-natural-radionuclides-in-canadian-drinking-water-1975-16
#3
Jing Chen, Michael W Cooke, Jean-Francois Mercier
Historical results of natural radioactivity in drinking water were reviewed for a total of 21 communities across Canada from 1975 to 2016. Analyses for 226Ra, 210Pb and total uranium were carried out on monthly composite samples of drinking water from selected Canadian municipalities. Generally speaking, levels of 226Ra, 210Pb and total uranium were found to be low compared to national and international standards for drinking water quality. Because levels were low, federal monitoring programs were discontinued in most communities in 1986 except for Regina, Elliot Lake and Port Hope...
October 13, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29039933/porous-uranium-diphosphonate-frameworks-with-trinuclear-units-templated-by-organic-ammonium-hydrolyzed-from-amine-solvents
#4
Zhi-Hui Zhang, Ganna A Senchyk, Yi Liu, Tyler Spano-Franco, Jennifer E S Szymanowski, Peter C Burns
By varying solvent systems, the solvothermal treatment of uranyl nitrate and methylenediphosphonic acid (H4PCP) afforded three new porous uranyl-organic frameworks (UOFs). All were structurally characterized by single-crystal X-ray diffraction and formulated as (Et2NH2)2[(UO2)3(PCP)2](H2O)2.5 (1), (MeNH3)(H3O)[(UO2)3(PCP)2(H2O)3] (2), and [Na(H2O)4](H3O)[(UO2)3(PCP)2(H2O)2](H2O)5 (3). These compounds crystallize with three-dimensional anionic frameworks containing U(VI) and distinct cationic species due to in situ solvent hydrolysis...
October 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29036375/uranium-in-soil-and-gamma-dose-rate-as-proxies-for-the-indoor-radon-risk-situation-in-belgium
#5
F Tondeur, G Cinelli, B Dehandschutter
Radon risk maps are usually based either on indoor radon data, or on measurements of soil gas radon and soil permeability. If these data are not available or not sufficient, it was suggested that other data could be used as an approximate substitute (a proxy) to the missing information, like the concentration of 238U or 226Ra in soils or the terrestrial gamma dose rate (TGDR). We examine here the correlation between airborne measurements of soil U and indoor radon, and between airborne U and TGDR, and their link with affected/unaffected areas...
September 23, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29029836/uranium-in-agricultural-soils-and-drinking-water-wells-on-the-swiss-plateau
#6
Moritz Bigalke, Lorenz Schwab, Agnes Rehmus, Patrick Tondo, Markus Flisch
Mineral phosphorus fertilizers are regularly applied to agricultural sites, but their uranium (U) content is potentially hazardous to humans and the environment. Fertilizer-derived U can accumulate in the soil, but might also leach to ground-, spring and surface waters. We sampled 19 mineral fertilizers from the canton of Bern and soils of three arable and one forest reference sites at each of four locations with elevated U concentrations (7-28 μg L(-1)) in nearby drinking water wells. The total U concentrations of the fertilizers were measured...
October 10, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29028336/reaction-of-co2-with-uo3-nanoclusters
#7
Luis A Flores, Julia G Murphy, William B Copeland, David A Dixon
Adsorption of CO2 to uranium oxide, (UO3)n, clusters was modeled using density functional theory (DFT) and coupled cluster theory (CCSD(T)). Geometries and reaction energies were predicted for carbonate formation (chemisorption) and Lewis acid-base addition of CO2 (physisorption) to these (UO3)n clusters. Chemisorption of multiple CO2 moieties was also modeled for dimer and trimer clusters. Physisorption and chemisorption were both predicted to be thermodynamically allowed for (UO3)n clusters, with chemisorption being the more thermodynamically favorable than physisorption...
October 13, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29024790/dna-methylation-and-potential-multigenerational-epigenetic-effects-linked-to-uranium-chronic-low-dose-exposure-in-gonads-of-males-and-females-rats
#8
REVIEW
G Elmhiri, C Gloaguen, S Grison, D Kereselidze, C Elie, K Tack, M Benderitter, P Lestaevel, A Legendre, M Souidi
INTRODUCTION: An increased health problem in industrialised countries is the contemporary concern of public and scientific community as well. This has been attributed in part to accumulated environmental pollutants especially radioactive substances and the use of nuclear power plants worldwide. However, the outcome of chronic exposure to low doses of a radionuclide such as uranium remains unknown. Recently, a paradigm shift in the perception of risk of radiotoxicology has emerged through investigating the possibility of transmission of biological effects over generations, in particular by epigenetic pathways...
October 9, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/29019408/cleaving-off-uranyl-oxygens-through-chelation-a-mechanistic-study-in-the-gas-phase
#9
Rebecca J Abergel, Wibe A de Jong, Gauthier J-P Deblonde, Phuong D Dau, Ilya Captain, Teresa M Eaton, Jiwen Jian, Michael J van Stipdonk, Jonathan Martens, Giel Berden, Jos Oomens, John K Gibson
Recent efforts to activate the strong uranium-oxygen bonds in the dioxo uranyl cation have been limited to single oxo-group activation through either uranyl reduction and functionalization in solution, or by collision induced dissociation (CID) in the gas-phase, using mass spectrometry (MS). Here, we report and investigate the surprising double activation of uranyl by an organic ligand, 3,4,3-LI(CAM), leading to the formation of a formal U(6+) chelate in the gas-phase. The cleavage of both uranyl oxo bonds was experimentally evidenced by CID, using deuterium and (18)O isotopic substitutions, and by infrared multiple photon dissociation (IRMPD) spectroscopy...
October 11, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29017012/reactive-transport-of-u-and-v-from-abandoned-uranium-mine-wastes
#10
Sumant M Avasarala, Peter C Lichtner, Abdul-Mehdi S Ali, Ricardo González-Pinzón, Johanna M Blake, Jose M Cerrato
The reactive transport of uranium (U) and vanadium (V) from abandoned mine wastes collected from the Blue Gap/Tachee Claim 28 mine site, AZ was investigated by integrating flow-through column experiments with reactive transport modelling, and electron microscopy. The mine wastes were sequentially reacted in flow-through columns at pH 7.9 (10 mM HCO3(-)) and pH 3.4 (10 mM CH3COOH) to evaluate the effect of environmentally relevant conditions encountered at Blue Gap/Tachee on the release of U and V. The reaction rate constants (km) for the dissolution of uranyl-vanadate (U-V) minerals predominant at Blue Gap/Tachee were obtained from simulations with the reactive transport software, PFLOTRAN...
October 10, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28985407/ustur-whole-body-case-0212-17-year-follow-up-of-plutonium-contaminated-wound
#11
Maia Avtandilashvili, Sara Dumit, Sergei Y Tolmachev
The National Council of Radiation Protection and Measurements' (NCRP) wound model was applied to the bioassay data from a United States Transuranium and Uranium Registries' whole-body tissue donor, Case 0212. This individual was exposed to plutonium nitrate as a result of an occupational wound injury and he underwent extensive chelation treatment with Ca-DTPA. All major soft tissues and bones were collected post-mortem and radiochemically analyzed for 238Pu, 239,240Pu and 241Am. The 239,240Pu activity in the total body was estimated to be 232...
July 7, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28982052/radionuclides-as-natural-tracers-of-the-interaction-between-groundwater-and-surface-water-in-the-river-andarax-spain
#12
Francisco Navarro-Martinez, Alejandro Salas Garcia, Francisco Sánchez-Martos, Antonio Baeza Espasa, Luis Molina Sánchez, Antonio Rodríguez Perulero
The identification of specific aquifers that supply water to river systems is fundamental to understanding the dynamics of the rivers' hydrochemistry, particularly in arid and semiarid environments where river flow may be discontinuous. There are multiple methods to identify the source of river water. In this study of the River Andarax, in the Southeast of Spain, an analysis of natural tracers (physico-chemical parameters, uranium, radium and radon) in surface water and groundwater indicates that chemical parameters and uranium clearly identify the areas where there is groundwater-surface water interaction...
October 2, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28981883/radon-concentration-in-the-area-of-waste-rock-dumps-brod-cr-case-study
#13
L Thinova, R Bican, A Fronka, K Johnova, J Solc, J Vosahlik
There are ~7000 mining waste storage facilities including waste rock dumps in the Czech Republic. One of the radiation protection present subjects is a health impact estimation of the huge mass of material in waste rock dumps left after uranium mining. In this document are presented selected results of waste rock dump long-term monitoring in the area of shaft No. 15 (Pribram, CR) and its estimated health impact to the representative person in a village Brod. The external irradiation was estimated based on in situ gamma spectrometry measurement results and on a Monte Carlo model and it turned out to be negligible (tens μSv), while the internal irradiation (RAMARN, ALGADE Environmental and RAMONIS detection systems) is more significant...
September 15, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28981874/seismic-prediction-using-unattached-radon-decay-products
#14
Naomi H Harley, Passaporn Chittaporn, Isabel M Fisenne
Long-term measurements of the 222Rn concentration, 222Rn decay product activity, particle size distribution, and unattached, and attached 222Rn decay products, were made at two locations using the 22 y radon decay product 210Pb as their tracer. The particle size sampler collects both short lived 222Rn decay products that ultimately decay to 210Pb on the filters, and also airborne 210Pb. The measurements were made outdoors, at a suburban home and at Fernald, OH, a former uranium processing facility, on top of one of the two 226Ra storage silos containing 150 TBq 226Ra...
September 15, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28981856/comparative-study-of-radon-exposure-in-canadian-homes-and-uranium-mines-a-discussion-on-the-importance-of-national-radon-program
#15
Jing Chen
The history of lung cancer in uranium miners is well known for over hundreds of years when the disease was referred to as 'miner's disease' or 'mountain sickness'. Radon levels in uranium mines have decreased significantly over the past 30 years as a result of effective radiation protection measures at workplaces. For the most recent 10-year period, the average radon concentrations to underground and surface workers in Canadian uranium mines were 111 and 11 Bq m-3, respectively. Based on the recent radon survey carried out in roughly 14 000 homes in 121 health regions across Canada and the more recent radon and thoron survey in 33 Canadian cities and 4000 homes, the average radon concentration in Canadian homes is 77 Bq m-3...
September 18, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28981796/assessment-of-radium-activity-concentration-and-radon-exhalation-rates-in-iberian-peninsula-building-materials
#16
E Andrade, C Miró, M Reis, M Santos, M J Madruga
Radium (226Ra) is a natural radioactive element of the uranium decay series, which could also be present in building materials. Radon (222Rn) is continuously produced by the decay of 226Ra and its presence inside buildings can contribute to the increase of the population exposure to ionizing radiation. In this work, the amount of radium activity concentration and radon exhalation rates in several types of building materials that are commonly used in the Iberian Peninsula have been tested. The radium activity concentration was measured by gamma-ray spectrometry, whereas the radon exhalation rates were carried out using a continuous radon monitor (active measuring technique) and a solid state nuclear track detectors (passive measuring technique)...
September 15, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28971546/determination-of-uranyl-tbp-aggregates-structures-coupling-experiments-with-molecular-dynamic-simulations
#17
Philippe Guilbaud, Laurence Berthon, Wilfried Louisfrema, Olivier Diat, Nicole Zorz
The complex structure of a PUREX process organic phase was characterized combining experiments and molecular dynamics simulations. For the first time the molecular interactions between TBP and the extracted solutes, and the TBP aggregation after extraction of water and/or uranyl nitrate were described and analysed concomitantly. It was emphasized that coupling molecular dynamics simulations with Small and Wide Angle X-ray Scattering (SWAXS) experiments can lead to simulated organic solutions that are representative of the experimental ones, even for high extractant and solute concentrations...
October 3, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28971198/polyethyleneimine-methylphosphonate-towards-the-design-of-a-new-class-of-macromolecular-actinide-chelating-agents-in-the-case-of-human-exposition
#18
Florian Lahrouch, Oleksandr Sofronov, Gaëlle Creff, André Rossberg, Christoph Hennig, Christophe Den Auwer, Chirstophe Di Giorgio
The use of uranium and to a minor extent plutonium as fuel for nuclear energy production or as components in military applications is under increasing public pressure. Uranium is weakly radioactive in its natural isotopy but its chemical toxicity, combined with its large scale industrial utilization, makes it a source of concern in terms of health impact for workers and possibly the general population. Plutonium is an artificial element that exhibits both chemical and radiological toxicities. So far, uranium (under its form uranyl, U(vi)) or plutonium (as Pu(iv)) decorporation or protecting strategies based on molecular design have been of limited efficiency to remove the actinide once incorporated after human exposure...
October 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28970911/metathesis-of-a-u-v-imido-complex-a-route-to-a-terminal-u-v-sulfide
#19
Rory P Kelly, Marta Falcone, Carlos Alvarez Lamsfus, Rosario Scopelliti, Laurent Maron, Karsten Meyer, Marinella Mazzanti
Herein, we report the synthesis and characterisation of the first terminal uranium(v) sulfide and a related U(V) trithiocarbonate complex supported by sterically demanding tris(tert-butoxy)siloxide ligands. The reaction of the potassium-bound U(V) imido complex, [U(NAd){OSi(OtBu)3}4K] (4), with CS2 led to the isolation of perthiodicarbonate [K(18c6)]2[C2S6] (6), with concomitant formation of the U(IV) complex, [U{OSi(OtBu)3}4], and S 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 1111111111111111111111111111111111 1111111111111111111111111111111111 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 1111111111111111111111111111111111 1111111111111111111111111111111111 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 CNAd...
August 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28970908/single-crystal-structures-and-theoretical-calculations-of-uranium-endohedral-metallofullerenes-u-c2n-2n-74-82-show-cage-isomer-dependent-oxidation-states-for-u
#20
Wenting Cai, Roser Morales-Martínez, Xingxing Zhang, Daniel Najera, Elkin L Romero, Alejandro Metta-Magaña, Antonio Rodríguez-Fortea, Skye Fortier, Ning Chen, Josep M Poblet, Luis Echegoyen
Charge transfer is a general phenomenon observed for all endohedral mono-metallofullerenes. Since the detection of the first endohedral metallofullerene (EMF), La@C82, in 1991, it has always been observed that the oxidation state of a given encapsulated metal is always the same, regardless of the cage size. No crystallographic data exist for any early actinide endohedrals and little is known about the oxidation states for the few compounds that have been reported. Here we report the X-ray structures of three uranium metallofullerenes, U@D3h-C74, U@C2(5)-C82 and U@C2v(9)-C82, and provide theoretical evidence for cage isomer dependent charge transfer states for U...
August 1, 2017: Chemical Science
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