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Rhenium in Molybdenite: a Database Approach to

2019-11-5  Rhenium Concentration and Deposit Type. Of the 731 sample sites in the database, 682 were assigned to one of the 30 deposit type categories shown in Fig. 2.Thirty-one of the remaining deposits belong to unknown types, 11 to districts with multiple undifferentiated mineralization styles, and the remaining seven to categories with fewer members than necessary to generate useful statistics.

Liquid–liquid extraction of rhenium(VII) from an acidic

2015-10-1  Rhenium extraction increased from 68% to 97% by increasing the acid concentration from 0.5 to 4.0 mol·L − 1 using 0.047 mol·L − 1 of Cyanex 923. With a leach solution of 2.0 mol·L − 1 HCl (and 1.07 g·L − 1 rhenium), the formation of a HReO 4 ·2[Cyanex 923] complex in the organic phase is supported by the plotted species diagram and the IR spectra.

Rhenium‐osmium isotope systematics and platinum

Rhenium and Os concentrations range from 0.3–15 ng/g and <1–276 pg/g, respectively. 187 Re/ 188 Os range from 32–30,000 (Figures 1 and 2). Such high 187 Re/ 188 Os lead to rapid ingrowth of radiogenic Os, resulting in present-day 187 Os/ 188 Os of up to 4.07 in Os-poor samples (Figure 1, filled symbols).

A model for the oceanic mass balance of rhenium and

2018-4-15  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

Clean and deep separation of molybdenum and

2.3. Characterizations. The concentrations of Mo and Re were measured by inductively coupled plasma (ICP, Thermo Scientific iCAP PRO X, America), and the coagulation or precipitation efficiency of Mo and Re were calculated as follows: (1) γ i = C i0-C i C i0 × 100 % where C i0 is the initial concentration of Mo or Re, mg/L; C i is the concentration after coagulation or precipitation, mg/L

Atom probe tomography analysis of the distribution

2010-2-1  Therefore, the analysis technique was tested on simulated datasets of known cluster density and size. All simulated datasets consisted of hypothetical binary alloys with a 3 at.% solute concentration similar to the rhenium concentrations in the binary alloy and in the γ phase of CMSX-4. Different datasets were created with several combinations of cluster size and density.

Working With SYBR Green Rhenium

No probe is required, which can reduce assay setup and running costs, assuming that your PCR primers are well designed, and your reaction is well characterized. Disadvantages of SYBR dye The primary

A first-principles model for anomalous segregation in

2017-3-3  In W-1 Re–1 Os alloy, just one percent rhenium concentration also appears to be sufficient for the formation of Re-rich clusters under irradiation. The presence of Os suppresses the formation of Re precipitates, with Os-rich clusters forming instead.

Deep‐sea coral record of human impact on watershed

2014-1-3  Trace metal analysis for rhenium (Re) concentration was performed on discrete growth layers using solution ICP-MS. In the outer, mid, and center regions of the radial transect, samples were taken at intervals of approximately 39, 97, and 143 µm, respectively.

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

Rhenium in Molybdenite: a Database Approach to

2019-11-5  Rhenium Concentration and Deposit Type. Of the 731 sample sites in the database, 682 were assigned to one of the 30 deposit type categories shown in Fig. 2.Thirty-one of the remaining deposits belong to unknown types, 11 to districts with multiple undifferentiated mineralization styles, and the remaining seven to categories with fewer members than necessary to generate useful statistics.

Rhenium‐osmium isotope systematics and platinum

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,

(PDF) Rhenium in Molybdenite: a Database Approach

2019-3-11  Rhenium concentration in molybdenite has a lognorma l distribution and varies systematically with type of geologic syst em, intrusive lithology, and Mo grade. The lowest-Re molybdenite occurs in

Rhenium uptake and distribution in phaeophyceae

2016-5-11  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

RHENIUM SOLUBILITY IN BOROSILICATE NUCLEAR

2012-8-13  The rhenium was found to be present predominantly as Re7 + in all the glasses as observed by X-ray absorption near-edge structure (XANES). (LA-ICP-MS). Assuming justifiably substantial similarities between Re7 + and Tc 7+ behavior in this glass system, thus maximizing the volatile concentration in contact with the glass.

Electrodeposition of Alloys of Rhenium with Iron

2019-12-1  In Ni–W, the highest concentration of W in the alloy was 50 atom %, with some indication that an alloy corresponding to the composition of may have been formed at very low FE (which could be explained by assuming that a somewhat similar precursor for the deposition of the alloy, namely existed).

(Electro‐)chemical Splitting of Dinitrogen with a

2020-1-14  Rhenium concentration dependent CV under Ar: A stock solution of 1 L2 was prepared by dissolving 1 L2 (15.3 mg, 25 µmol) in a 1.0 mL of solution of 0.2 m (nBu 4 N)PF 6 in THF. Aliquots of this stock solution were added to a 5 mL of solution of 0.2 m ( n Bu 4 N)PF 6 in THF, with a spatula tip of Fe(Cp) 2 as an electrochemical reference, to

A dinuclear rhenium complex in the electrochemically

A dinculear Re(CO) 3 complex with a proton responsive phenol unit and a pyrene anchor in the ligand backbone was investigated in the electrochemical CO 2 /H + conversion in solution and adsorbed on multi walled carbon nanotubes (MWCNT) on an GC electrode surface. The pyrene group unit is introduced at the end of the ligand synthesis via a coupling reaction, which allows for a versatile ligand

(PDF) Influence of Rhenium and Ruthenium on the

The effect of rhenium and ruthenium on the hardness of the γ′ precipitates and the γ matrix in nickel-base superalloys was investigated using a nanoindenting atomic force microscope.

Rhenium in Molybdenite: a Database Approach to

2019-11-5  Rhenium Concentration and Deposit Type. Of the 731 sample sites in the database, 682 were assigned to one of the 30 deposit type categories shown in Fig. 2.Thirty-one of the remaining deposits belong to unknown types, 11 to districts with multiple undifferentiated mineralization styles, and the remaining seven to categories with fewer members than necessary to generate useful statistics.

(PDF) Rhenium in Molybdenite: a Database Approach

2019-3-11  Rhenium concentration in molybdenite has a lognorma l distribution and varies systematically with type of geologic syst em, intrusive lithology, and Mo grade. The lowest-Re molybdenite occurs in

Rhenium uptake and distribution in phaeophyceae

2016-5-11  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

RHENIUM SOLUBILITY IN BOROSILICATE NUCLEAR

2012-8-13  The rhenium was found to be present predominantly as Re7 + in all the glasses as observed by X-ray absorption near-edge structure (XANES). (LA-ICP-MS). Assuming justifiably substantial similarities between Re7 + and Tc 7+ behavior in this glass system, thus maximizing the volatile concentration in contact with the glass.

Rhenium Enrichment in the Muratdere Cu-Mo (Au-Re)

Porphyry Cu deposits provide 90% of the world’s rhenium production (Sinclair, 2007; Polyak, 2016).Rhenium is an essential element in a number of industrial applications, including superalloy production to make Ni-Re alloys for use in turbine blades for jet and industrial gas turbine engines and Pt-Re catalysts that improve the efficiency of crude oil refining ().

Electrodeposition of Alloys of Rhenium with Iron

2019-12-1  In Ni–W, the highest concentration of W in the alloy was 50 atom %, with some indication that an alloy corresponding to the composition of may have been formed at very low FE (which could be explained by assuming that a somewhat similar precursor for the deposition of the alloy, namely existed).

(PDF) Diffusion in the nickel-rhenium system Daniele

Further work is necessary to test this hypothesis, for instance by direct measurements of nickel concentration at rhenium grain boundaries, or by experiments on bicrystals.The activation energy for self-diffusion of nickel (0=285 kJImol for T=1253-1670 K (16)) is also significantly higher than the measured activation energy for the diffusion of

Hydrogen Evolution Reaction Electrocatalysts Based

2020-10-30  As the concentration of nickel and rhenium compounds in solution increases (c(\({\text{ReO}}_{{\text{4}}}^{-}\))/c(Ni(II)) = 1), the rate of chemical-catalytic deposition of the alloy quite expectedly increases (Fig. 7, curve 1)); however, the obtained dependence of the deposition rate on the concentration is far from being linear: the

Chapter 3 Stoichiometry Chemistry

2012-9-12  Assuming 100.00 g of para-aminobenzoic acid, C: 61.31 g x = 5.105 mol C H: 5.14 g x = 5.09 mol H N: 10.21 g x = 0.7288 mol N O: 23.33 g x = 1.456 mol O 1 mol 12.01 g 1 mol 14.01 g 1 mol 1.01 g 1 mol 16.00 g . Stoichiometry Calculating Empirical Formulas Calculate the mole ratio by dividing by the smallest number

通过价层电子密度分析展现分子电子结构 pku.edu.cn

2017-8-31  迄今已有众多实空间函数被提出用来揭示化学上感兴趣的分子电子结构特征,例如化学键、孤对电子和多中心电子共轭。在这些分析方法中,电子定域化函数(ELF)、电子密度的拉普拉斯(∇ 2 ρ)和变形密度(ρ def)被广泛用于实际研究。众所周知,分析分子的总电子密度无法像以上提及的方法那样展现出

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