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https://www.readbyqxmd.com/read/28324179/interactions-of-phosphate-solubilising-microorganisms-with-natural-rare-earth-phosphate-minerals-a-study-utilizing-western-australian-monazite
#1
Melissa K Corbett, Jacques J Eksteen, Xi-Zhi Niu, Jean-Philippe Croue, Elizabeth L J Watkin
Many microbial species are capable of solubilising insoluble forms of phosphate and are used in agriculture to improve plant growth. In this study, we apply the use of known phosphate solubilising microbes (PSM) to the release of rare-earth elements (REE) from the rare-earth phosphate mineral, monazite. Two sources of monazite were used, a weathered monazite and mineral sand monazite, both from Western Australia. When incubated with PSM, the REE were preferentially released into the leachate. Penicillum sp...
March 21, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28314102/unique-four-electron-metal-to-cage-charge-transfer-of-th-to-a-c82-fullerene-cage-complete-structural-characterization-of-th-c3v-8-c82
#2
Yaofeng Wang, Roser Morales-Martínez, Xingxing Zhang, Wei Yang, Yaxing Wang, Antonio Rodriguez-Fortea, Josep M Poblet, Lai Feng, Shuao Wang, Ning Chen
Endohedral metallofullerenes (EMFs) containing lanthanides have been intensively studied in recent years. By contrast, actinide endohedral fullerenes remain largely unexplored. Herein, for the first time, we report the single crystal structure and full characterization of an actinide endohedral fullerene, Th@C82, which exhibits remarkably different electronic and spectroscopic properties compared to those of lanthanide EMFs. Single crystal X-ray crystallography unambiguously established the molecular structure as Th@C3v(8)-C82...
March 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28303615/rare-earth-elements-and-select-actinoids-in-the-canadian-house-dust-study
#3
Pat E Rasmussen, Christine Levesque, Marc Chénier, H David Gardner
Nationally representative baseline data are presented for rare earth elements (REE), plus thorium (Th) and uranium (U) in house dust sampled from 1025 urban homes, in units of concentrations (μg g(-1) ), loadings (μg m(-2) ) and loading rates (ng m(-2) day(-1) ). Spearman rank correlations indicate that, in addition to outdoor sources, consumer products and building materials can influence indoor dust concentrations of REE, Th and U. Correlations (p <0.01) with numbers of occupants, dogs and cats suggest soil track-in...
March 17, 2017: Indoor Air
https://www.readbyqxmd.com/read/28294439/coordination-of-tetravalent-actinides-an-th-iv-u-iv-np-iv-pu-iv-with-dota-from-dimers-to-hexamers
#4
Christelle Tamain, Thomas Dumas, Christoph Hennig, Philippe Guilbaud
Three tetravalent actinide (An(IV)) hexanuclear clusters with the octahedral core [An6(OH)4O4]12+ (An(IV) = U(IV), Np(IV), Pu(IV)) were structurally characterized in solid state and in aqueous solution using single crystal X-ray diffraction, X-ray absorption, IR, Raman and UV-Visible spectroscopy. The observed structure, [An6(OH)4O4(H2O)8(HDOTA)4].HCl/HNO3.nH2O (An = U (I), Np (II), Pu (III)), consists of a An(IV) hexanuclear pseudo-octahedral cluster stabilized by DOTA (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) ligands...
March 10, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28286909/pygoscelis-antarcticus-feathers-as-bioindicator-of-trace-element-risk-in-marine-environments-from-barton-peninsula-25-de-mayo-king-george-island-antarctica
#5
Soledad Perez Catán, Debora Bubach, Carla Di Fonzo, Laura Dopchiz, Maria Arribére, Martin Ansaldo
We report the contents of elements in feathers of Chinstrap penguin (Pygoscelis antarcticus), which had not been informed up to now, such as silver and bromine and others listed as hazardous by the United States Environmental Protection Agency as arsenic, cobalt, chromium, and mercury. Analyses of the element concentrations in feathers, adult and chicken, from Barton Peninsulas at 25 de Mayo (King George) Island, South Shetlands, were made by Instrumental Neutron Activation Analysis. Samarium, lanthanum a, thorium, and uranium concentrations in Chinstrap penguin feathers were below 0...
March 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28276437/triamidoamine-thorium-arsenic-complexes-with-parent-arsenide-arsinidiide-and-arsenido-structural-motifs
#6
Elizabeth P Wildman, Gábor Balázs, Ashley J Wooles, Manfred Scheer, Stephen T Liddle
Despite a major expansion of uranium-ligand multiple bond chemistry in recent years, analogous complexes involving other actinides (An) remain scarce. For thorium, under ambient conditions only a few multiple bonds to carbon, nitrogen, phosphorus and chalcogenides are reported, and none to arsenic are known; indeed only two complexes with thorium-arsenic single bonds have been structurally authenticated, reflecting the challenges of stabilizing polar linkages at the large thorium ion. Here, we report thorium parent-arsenide (ThAsH2), -arsinidiides (ThAs(H)K and ThAs(H)Th) and arsenido (ThAsTh) linkages stabilized by a bulky triamidoamine ligand...
March 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28273889/structural-phase-transition-of-thc-under-high-pressure
#7
Cun Yu, Jun Lin, Ping Huai, Yongliang Guo, Xuezhi Ke, Xiaohe Yu, Ke Yang, Nana Li, Wenge Yang, Baoxing Sun, Ruobing Xie, Hongjie Xu
Thorium monocarbide (ThC) as a potential fuel for next generation nuclear reactor has been subjected to its structural stability investigation under high pressure, and so far no one reported the observation of structure phase transition induced by pressure. Here, utilizing the synchrotron X-ray diffraction technique, we for the first time, experimentally revealed the phase transition of ThC from B1 to P4/nmm at pressure of ~58 GPa at ambient temperature. A volume collapse of 10.2% was estimated during the phase transition...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28262714/size-resolved-pb-distribution-in-the-athabasca-river-shows-snowmelt-in-the-bituminous-sands-region-an-insignificant-source-of-dissolved-pb
#8
Muhammad Babar Javed, Chad W Cuss, Iain Grant-Weaver, William Shotyk
Lead (Pb) is a metal of special importance because of its long history of commercial and industrial use, global atmospheric contamination accelerated by the use of gasoline additives, and health effects, with children being especially vulnerable. Global atmospheric Pb pollution reached its zenith in the 1970's, but subsequent impacts on freshwater aquatic systems are poorly understood. Employing metal-free sampling and handling protocols, we show that snowmelt from the Athabasca bituminous sands region is an insignificant source of dissolved Pb to the Athabasca River (AR)...
March 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28240899/synthesis-structure-and-reactivity-of-the-sterically-crowded-th-3-complex-c5me5-3th-including-formation-of-the-thorium-carbonyl-c5me5-3th-co-bph4
#9
Ryan R Langeslay, Guo P Chen, Cory J Windorff, Alan K Chan, Joseph W Ziller, Filipp Furche, William J Evans
The Th(3+) complex, (C5Me5)3Th, has been isolated despite the fact that tris(pentamethylcyclopentadienyl) complexes are highly reactive due to steric crowding and few crystallographically characterizable Th(3+) complexes are known due to their highly reducing nature. Reaction of (C5Me5)2ThMe2 with [Et3NH][BPh4] produces the cationic thorium complex [(C5Me5)2ThMe][BPh4] that can be treated with KC5Me5 to generate (C5Me5)3ThMe, 1. The methyl group on (C5Me5)3ThMe can be removed with [Et3NH][BPh4] to form [(C5Me5)3Th][BPh4], 2, the first cationic tris(pentamethylcyclopentadienyl) metal complex, which can be reduced with KC8 to yield (C5Me5)3Th, 3...
February 27, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28221794/probing-chemical-bonding-and-electronic-structures-in-tho-by-anion-photoelectron-imaging-and-theoretical-calculations
#10
Yanli Li, Jinghan Zou, Xiao-Gen Xiong, Jing Su, Hua Xie, Zejie Fei, Zichao Tang, Hongtao Liu
Because of renewed research on thorium-based molten salt reactors, there is growing demand and interest in enhancing the knowledge of thorium chemistry both experimentally and theoretically. Compared with uranium, thorium has few chemical studies reported up to the present. Here we report the vibrationally resolved photoelectron imaging of the thorium monoxide anion. The electron affinity of ThO is first reported to be 0.707 ± 0.020 eV. Vibrational frequencies of the ThO molecule and its anion are determined from Franck-Condon simulation...
March 1, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28217779/unusual-binding-selectivity-with-non-selective-homoditopic-pillar-5-arene-oxime-serendipitous-discovery-of-a-unique-approach-to-heterobinuclear-metalation-in-solution
#11
Xiangyang Yuan, Yiming Jia, Yimin Cai, Wen Feng, Yiming Li, Xiaopeng Li, Lihua Yuan
A heterobinuclear complexation strategy on homoditopic pillar[5]arene was developed by using a pillar[5]arene with two rims decorated with benzaldehyde oximes. The unique selective recognition process was found to result from vesicular formation based on a controllable self-assembly, leading to binding of thorium(iv) only onto one rim, with the other rim being unoccupied for subsequent complexation of a second different metal ion.
February 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28216136/arsenic-speciation-in-the-lower-athabasca-river-watershed-a-geochemical-investigation-of-the-dissolved-and-particulate-phases
#12
Mark W Donner, Muhammad Babar Javed, William Shotyk, Kevin A Francesconi, Tariq Siddique
Human and ecosystem health concerns for arsenic (As) in the lower Athabasca River downstream of Athabasca Bituminous Sands (ABS) mining (Alberta, Canada) prompted an investigation to determine its forms in surface and groundwater upstream and downstream of industry. Dissolved As species, together with total and particulate As, were used to evaluate the potential bioavailability of As in water as well as to decipher inputs from natural geological processes and ABS mining and upgrading activities. Water samples were collected from the river in October at 13 locations in 2014 and 19 locations in 2015, spanning up to 125 km...
February 17, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28195738/thorium-and-uranium-hydride-phosphorus-and-arsenic-bearing-molecules-with-single-and-double-actinide-pnictogen-and-bridged-agostic-hydrogen-bonds
#13
Lester Andrews, Han-Gook Cho, K Sahan Thanthiriwatte, David A Dixon
Thorium atoms from laser ablation react with phosphine during condensation in excess argon to produce two new infrared absorptions at 1467.2 and 1436.6 cm(-1) near weak bands for ThH and ThH2, which increase on annealing to 25 and 30 K, indicating spontaneous reactions. Analogous experiments with uranium produced two similar bands at 1473.4 and 1456.7 cm(-1) above UH at 1423.8 cm(-1) and another absorption at 1388.2 cm(-1). Electronic structure calculations at the coupled cluster CCSD(T) for Th and density functional theory calculations for U as well as their proximity to other actinide hydride absorptions support assignments of these bands to the simplest molecules HP═ThH2, HP═UH2, and PH2-UH...
February 14, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28195703/mass-spectrometric-determination-of-uranium-and-thorium-in-high-radiopurity-polymers-using-ultra-low-background-electroformed-copper-crucibles-for-dry-ashing
#14
Isaac J Arnquist, Eric J Hoppe, Mary Bliss, Jay W Grate
A rapid new method for determining the U and Th mass concentrations in high radiopurity plastics is described, consisting of (1) dry ashing the plastic sample and tracers in low mass crucibles made of ultra low background electroformed copper (ULB EF-Cu) foil cut and folded into boats, (2) dissolving both the ash and the boat in acid, (3) performing a column separation to remove copper, and (4) determining the elements of interest by isotope dilution mass spectrometry. This method was demonstrated on both unfluorinated and fluorinated plastics, demonstrating high tracer recoveries and detection limits to pg/g (i...
February 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28191940/thorium-chemistry-in-oxo-tellurium-system-under-extreme-conditions
#15
Bin Xiao, Philip Kegler, Dirk Bosbach, Evgeny V Alekseev
Through the use of a high-temperature/high-pressure synthesis method, four thorium oxo-tellurium compounds with different tellurium valence states were isolated. The novel inorganic phases illustrate the intrinsic complexity of the actinide tellurium chemistry under extreme conditions of pressure and temperature. Th2Te3O11 is the first instance of a mixed-valent oxo-tellurium compound, and at the same time, Te exhibits three different coordination environments (Te(IV)O3, Te(IV)O4, and Te(VI)O6) within a single structure...
February 13, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28161042/factors-affecting-atmospheric-radon-concentration-human-health
#16
D E Tchorz-Trzeciakiewicz, M Kłos
We studied the influence of terrain, geology and weather condition on radon concentration in the atmosphere and occurrence of radon density currents. The survey was carried out in Kowary (SW Poland) and in the spoil tip formed during uranium mining. The measurements of radon concentration were performed using SSNTD LR-115. The measurements of uranium thorium and potassium content in soil were carried out using gamma ray spectrometer Exploranium RS-230. We noticed that terrain and stability of weather condition had significant impact on atmospheric radon concentration...
April 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28155857/the-inverse-trans-influence-in-tetravalent-lanthanide-and-actinide-bis-carbene-complexes
#17
Matthew Gregson, Erli Lu, David P Mills, Floriana Tuna, Eric J L McInnes, Christoph Hennig, Andreas C Scheinost, Jonathan McMaster, William Lewis, Alexander J Blake, Andrew Kerridge, Stephen T Liddle
Across the periodic table the trans-influence operates, whereby tightly bonded ligands selectively lengthen mutually trans metal-ligand bonds. Conversely, in high oxidation state actinide complexes the inverse-trans-influence operates, where normally cis strongly donating ligands instead reside trans and actually reinforce each other. However, because the inverse-trans-influence is restricted to high-valent actinyls and a few uranium(V/VI) complexes, it has had limited scope in an area with few unifying rules...
February 3, 2017: Nature Communications
https://www.readbyqxmd.com/read/28091341/correlation-between-infectious-disease-and-soil-radiation-in-japan-an-exploratory-study-using-national-sentinel-surveillance-data
#18
S Inaida, T Tsuda, S Matsuno
We investigated the relationship between epidemics and soil radiation through an exploratory study using sentinel surveillance data (individuals aged <20 years) during the last three epidemic seasons of influenza and norovirus in Japan. We used a spatial analysis method of a geographical information system (GIS). We mapped the epidemic spreading patterns from sentinel incidence rates. We calculated the average soil radiation [dm (μGy/h)] for each sentinel site using data on uranium, thorium, and potassium oxide in the soil and examined the incidence rate in units of 0·01 μGy/h...
January 16, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28079075/hydroclimate-changes-across-the-amazon-lowlands-over-the-past-45-000-years
#19
Xianfeng Wang, R Lawrence Edwards, Augusto S Auler, Hai Cheng, Xinggong Kong, Yongjin Wang, Francisco W Cruz, Jeffrey A Dorale, Hong-Wei Chiang
Reconstructing the history of tropical hydroclimates has been difficult, particularly for the Amazon basin-one of Earth's major centres of deep atmospheric convection. For example, whether the Amazon basin was substantially drier or remained wet during glacial times has been controversial, largely because most study sites have been located on the periphery of the basin, and because interpretations can be complicated by sediment preservation, uncertainties in chronology, and topographical setting. Here we show that rainfall in the basin responds closely to changes in glacial boundary conditions in terms of temperature and atmospheric concentrations of carbon dioxide...
January 11, 2017: Nature
https://www.readbyqxmd.com/read/28059763/permanent-human-occupation-of-the-central-tibetan-plateau-in-the-early-holocene
#20
M C Meyer, M S Aldenderfer, Z Wang, D L Hoffmann, J A Dahl, D Degering, W R Haas, F Schlütz
Current models of the peopling of the higher-elevation zones of the Tibetan Plateau postulate that permanent occupation could only have been facilitated by an agricultural lifeway at ~3.6 thousand calibrated carbon-14 years before present. Here we report a reanalysis of the chronology of the Chusang site, located on the central Tibetan Plateau at an elevation of ~4270 meters above sea level. The minimum age of the site is fixed at ~7.4 thousand years (thorium-230/uranium dating), with a maximum age between ~8...
January 6, 2017: Science
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