Rhenium Concentration Assuming

  • Rhenium | chemical element | Britannica

    Rhenium does not occur free in nature or as a compound in any distinct mineral; instead it is widely distributed in small amounts in other minerals, usually in concentrations averaging about 0.001 parts per million. Chile is the world leader in rhenium recovery, followed by the United States, Poland, Uzbekistan, and Kazakhstan.

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  • Enhanced mantle-to-crust rhenium transfer in undegassed ...

    Mar 20, 2003· The post-Archaean CC is primarily a product of convergent margin magmatism with minor contributions from plume-related basalts 8,27, both of which have low Yb/Re ratios 6,21.Assuming …

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  • Rhenium (Re) - Properties, Applications

    Rhenium is a silvery-white metal, with one of the highest melting points of all metals. With an average concentration of 1 ppb, rhenium is one of the rarest elements in the Earth’s crust. It is usually available in powdered form, but it can be consolidated by pressing and sintering in …

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  • Rhenium uptake and distribution in phaeophyceae macroalgae ...

    1. Introduction. The behaviour of rhenium (Re) in seawater is defined by the low reactivity of the perrhenate ion (ReO 4 −; Re(VII)), which is the only significant Re species found in ocean waters [].The concentration of Re in the open ocean (0.0074–0.009 ng g −1; [2,3]) is a factor of three higher than average river water (approx. 0.005 pg g −1; []) and much lower compared with ...

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  • Solved: The Element Rhenium (Re) Has Two Naturally Occurri ...

    The element rhenium (Re) has two naturally occurring isotopes, 185 Re and 187 Re, with an average atomic mass of 186.207 amu. Rhenium is 62.60% 187 Re, and the atomic mass of 187 Re is 186.956 amu. Calculate the mass of 185 Re. (Give your answer to 3 decimal places.) Chloral hydrate (C 2 H 3 Cl 3 O 2) is a drug formerly used as a sedative and hypnotic.It is the compound used to make "Mickey ...

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  • Molybdenite as a Rhenium Carrier: First Results of a ...

    in a disordered way, assuming a prismatic coordination like W4+ ions in WS 2. As an attempt to certify such replacement, a theoretical simulation of Re L3-edge XANES spectrum in rhenium disulphide—a stable compound with a triclinic crystal 1 (JMMCE

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  • Rhenium–Osmium Geochronology: Sulfides, Shales, Oils, and ...

    Rhenium–osmium geochronology is based on radioactive decay of 187 Re to 187 Os with a half-life of 41.6 b.y. – about 10 times the age of the earth. Both Re and Os are siderophile-chalcophile elements, that is, they are both strongly partitioned into metals or sulfides rather than silicates.

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  • Periodic Table - Ptable

    75 Re Rhenium 186.21; 76 Os Osmium 190.23; 77 Ir Iridium 192.22; 78 Pt Platinum 195.08; 79 Au Gold 196.97; 80 Hg Mercury 200.59; 81 Tl Thallium 204.38; 82 Pb Lead 207.2; 83 Bi Bismuth 208.98; 84 Po Polonium (209) 85 At Astatine (210) 86 Rn Radon (222)

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  • Investigation of the potential application of rhenium in ...

    Upon increasing the polymer’s rhenium concentration, these microspheres could be utilized in embolotherapy. Rhenium’s radioisotope Re¹⁸⁸ is a mixed beta and gamma emitter and can thus be exploited in another imaging modality: single photon emission computed tomography (SPECT). The biodistribution of microspheres labeled with Re¹⁸⁸ ...

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  • The adsorption kinetics of nitrogen on rhenium - NASA/ADS

    The dependence of the sticking coefficient upon surface coverage and temperature could be accounted for by assuming an intermediate state weakly bound to an adsorption site. These sites were assumed to be uniformly distributed over the surface. Their concentration was found to be less than {1}/{10} of the number of substrate-rhenium atoms/cm 2 ...

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  • Rhenium‐osmium isotope systematics and platinum group ...

    The average Ir concentration in loess of 22 pg/g may thus be a good estimate of the average Ir concentration in the upper continental crust. This is confirmed by the positive correlation of Ir with Co ( r 2 = 0.48) that yields an Ir concentration between 17 and 25 …

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  • Rhenium - Element information, properties and uses ...

    Rhenium was the lower one and indeed it was the last stable, non-radioactive, naturally-occurring element to be discovered. In 1905, Masataka Ogawa found it in the mineral thorianite from Sri Lanka. ... reserve distribution, production concentration, substitutability, recycling rate and political stability scores. Crustal abundance (ppm) The ...

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  • Molybdenite as a Rhenium Carrier: First Results of a ...

    The chemical and physical properties of rhenium render it a highly demanded metal for advanced applications in important industrial fields. This very scarce element occurs mainly in ores of porphyry copper-molybdenum deposits associated with the mineral molybdenite, MoS2, but it has also been found in granite pegmatites and quartz veins as well as in volcanic gases.

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  • Pourbaix diagram - Wikipedia

    In electrochemistry, and more generally in solution chemistry, a Pourbaix diagram, also known as a potential/pH diagram, E H –pH diagram or a pE/pH diagram, is a plot of possible thermodynamically stable phases (i.e., at chemical equilibrium) of an aqueous electrochemical system.Boundaries (50 %/50 %) between the predominant chemical species (aqueous ions in solution, or solid phases) are ...

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  • A model for the oceanic mass balance of rhenium and ...

    Apr 15, 2018· Rhenium (Re) behaves conservatively in oxygenated seawater and, unlike Mo, can be efficiently removed to anoxic sediments at low dissolved H 2 S levels when the bottom waters are weakly oxygenated or anoxic, thus making it a more effective proxy for tracking general ocean anoxia (i.e., combined euxinic and ferruginous anoxia) (Colodner et al., 1993, Crusius et al., 1996, Morford and …

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  • US20140356260A1 - Method for separating rhenium and ...

    US20140356260A1 US14/368,468 US201314368468A US2014356260A1 US 20140356260 A1 US20140356260 A1 US 20140356260A1 US 201314368468 A US201314368468 A US 201314368468A US 2014356260 A1 US2014356260 A1 US 2014356260A1 Authority US United States Prior art keywords arsenic rhenium precipitate purification mentioned Prior art date 2012-03-02 Legal status (The legal …

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  • Rhenium‐osmium isotope systematics and platinum group ...

    Rhenium, Os, 187Os/188Os, Ir, ... calculated assuming closed system and using Re and Os data on different sample splits, ... The predicted Ir concentration of ∼9 ng Ir per kg HT fluid is 2–3 orders of magnitude higher than Os concentrations in vent fluids [Sharma et al., 2000] and is easily detectable, ...

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  • Measurements of rhenium isotopic composition in low ...

    Rhenium oxidation states range from −1 to +7, with the most abundant being +7, +6 and +4. 9 Rhenium is a soluble element in oxic conditions and mostly present in surface waters in the form of the oxyanion Re VII O 4 −. 1,2,10 In seawater, Re has a conservative behaviour with an average present-day concentration around 7.5 ppt. 2,3 Under ...

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  • Adsorptive separation of rhenium and rhodium in nitric ...

    removal of rhenium, which is a chemical analogue of technetium. eW evaluated the equilibrium parameters such as the maximum ad-sorption capacities and the equilibrium constants based on the Lang-muir model, and we also estimated the diffusivities for a batch-wise kinetic system by assuming a homogeneous diffusion in the solid e. s a ph

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  • Rhenium uptake and distribution in phaeophyceae macroalgae ...

    Owing to Rhenium (Re) having no known biological role, it is not fully understood how Re is concentrated in oil kerogens. A commonly held assumption is that Re is incorporated into decomposing biomass under reducing conditions. However, living macroalgae also concentrate Re to several orders of magnitude greater than that of seawater. This study uses Fucus vesiculosus to assess Re uptake and ...

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  • (PDF) Rhenium Solubility in Borosilicate Nuclear Waste ...

    The required average maximum concentration of Tc to be immobilized in Hanford LAW glass can be approximated from (1) the total estimated Tc inventory in the underground tanks (∼1.5 × 10 3 kg per Mann 2004) 2 and (2) the total estimated mass of LAW glass to be produced (5.3 × 10 8 kg per Certa et al 2011). 1 Assuming retention of Tc and ...

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  • Working With SYBR Green - Rhenium

    Rhenium Tel: +972-8-955-8888 Fax: +972-8-996-9688 20 Hasatat, P.O.B 180, Modi’in 7171101, Israel

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  • Blue rhenium tricarbonyl DPPZ complexes – low energy ...

    Blue rhenium tricarbonyl DPPZ complexes ... however titrations indicate that the formation of the blue species is dependent upon both diamine concentration and rhenium concentration, ... (assuming coordination through the primary amine), and amino alcohols should show hydrogen bond acceptance properties, but did not give blue complexes. ...

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  • Experimental determination of the hydrothermal solubility ...

    Assuming the rhenium concentration in molybdenite in the Little Boulder Creek deposit is of the order of 100 to 200 ppm, the mass of rhenium in this deposit is estimated to be from ~2.5 × 10 7 to ~5 × 10 7 grams (Table (Table5 5).

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  • High-Temperature Oxidation Behavior of Iridium-Rhenium …

    where C is the Re concentration, t is time, and x is the position normal to the Ir/Re interface. This equation was solved numerically by using the Crank-Nicholson differencing scheme, with the boundary conditions of zero Re flux at the Ir (inner) surface and 100-percent Re concentration at the Ir/Re interface. In the life model, the inner

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  • Rhenium in ores of porphyry copper deposits in the Urals

    The concentration of rhenium in molybdenite varies significantly reaching 0.63 wt %, as is evident from our recent measurements (see below). ... have been reinterpreted assuming that the following ...

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  • Study on Determination of Technetium -99 in Environmental ...

    The concentration variations of rhenium in sample treatment are measured by inductively coupled plasma- mass spectroscopy. The recovery of rhenium during ... Assuming a measurement time of 100 minutes, a background count rate of 6cpm, counting efficiency of 65% and a recovery of . Then the

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  • Geological respiration of a mountain belt revealed by the ...

    Rhenium concentration, [Re], and petrogenic organic carbon concentration, [OCpetro], have been normalized to an immobile element (aluminum, Al2O3) to track weathering processes. Arrow indicates coupled loss of Re and OCpetro from soil horizons from Taiwan confirming work on OCpetro-rich lithologies elsewhere (Jaffe et al., 2002).

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  • [Solved] Rhenium has an HCP crystal structure, an atomic ...

    Rhenium has an HCP crystal structure, an atomic radius of 0.137 nm, and a c/a ratio of 1.615. Compute the volume of the unit cell for Re. ... Assuming a population standard deviation of .8735, ... the concentration c (atoms/cm3) versus x (cm) for anneal times of 5 minutes, 10 minutes, ...

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  • Determination of rhenium in plant materials, Journal of ...

    Feb 16, 2005· The concentration of rhenium in plants Determination of rhenium in real plant materi- from the Moscow region (nettle and meadow grasses) is als. The geochemical characterization of the regions <3 ± 2 ng/g (n = 7). where plants were taken (polymetal sulfide, copper With a corresponding sample preparation proce- slate, copper–molybdenum, or ...

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