rhenium concentration assuming

Experimental determination of the hydrothermal solubility ...

2021-10-29 · Samples collected for this study from the: (a) Erlenbach, Switzerland; (b) Vogelbach, Switzerland; and (c) the East River, Colorado, USA. In all panels, water discharge record is shown in gray and the symbols show measured dissolved rhenium concentration, [Re] pmol L −1, with whiskers showing the analytical uncertainty.Rhenium Solubility in Borosilicate Nuclear ... - OSTI.GOV2012-8-13 · At higher rhenium concentrations, some additional material was retained in the glassesmore » Assuming justifiably substantial similarities between Re7 + and Tc 7+ behavior in this glass system, these results implied that the processing and immobilization of 99Tc from radioactive wastes should not be limited by the solubility of 99Tc in ...

Hydrogen Evolution Reaction Electrocatalysts Based on ...

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 ...Enhanced mantle-to-crust rhenium transfer in undegassed ...2003-3-20 · Variations in the 187Os/188Os isotopic signature of mantle and mantle-derived rocks have been thought to provide a powerful chemical tracer of deep Earth structure. Many studies have inferred from ...

A standard stock solution of rhenium containing 1 mg …

2019-8-28 · rhenium and its separation from tungsten and other elements. The results are reported in this note., if NOTES A standard stock solution of rhenium containing 1 mg Re/ml was prepared by dissolving weighed amount of ''specpure'' potassium perrhenate (Johnson-Matthey). Lower concentrations at the Jo''gfmI level were made by suitable dilution ...Radioisotope Decay & Half-Lives: Rhenium-187 | Answers ...2015-2-25 · Rhenium-osmium concentration and isotope systematics in group IIAB iron meteorites. Geochimica et Cosmochimica Acta 59, no. 11:2331–2344. Naldrett, S. N. 1958. Half-life of rhenium and ages of minerals. Annals of the …

Radioactive rhenium complexed to 2-hydroxy isobutyric …

The final concentration of the reagents are rhenium 2×10-5 M, ethane dithiol 4×10-5 M (2×excess assuming 2 thiol molecules per 1 rhenium atom) isobutyric acid 1.4 molar and stannous chloride 3×10-3 M. After 1 hour from the pH adjustment, the sample was analyzed with HPLC with the use of a C-18 5 micron reverse phase column using 25% .. parison of Rhenium and Iodine as Contrast Agents in …2021-11-1 · Purpose . The majority of X-ray contrast agents (XCA) are made with iodine, but iodine-based XCA (I-XCA) exhibit low contrast in high kVp X-rays due to iodine''s low atomic number ( Z = 53) and K-edge (33.1 keV). While rhenium is a transition metal with a high atomic number ( Z = 75) and K-edge (71.7 keV), the utilization of rhenium-based …

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 …(PDF) Measurements of rhenium isotopic composition in … · Rhenium concentration data from published work. 1,2,14,21 Figures - available via license: Creative Commons Attribution-NonCommercial 3.0 Unported Content may be …

(PDF) Measurements of rhenium isotopic composition in …

 · Rhenium concentration data from published work. 1,2,14,21 Figures - available via license: Creative Commons Attribution-NonCommercial 3.0 Unported Content may be …Rhenium‐osmium isotope systematics and platinum group ...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 …

A first-principles model for anomalous segregation in ...

2017-3-3 · In this section, to understand the anomalous segregation of rhenium occurring in W–Re alloys under irradiation condition, where alloys are not quenched from high temperatures but are irradiated at a constant temperature, we performed MC simulations at various temperatures assuming a certain concentration of vacancies and Re atoms.Unique Rhenium Deposit in the Carboniferous Coal …2020-7-12 · The maximum vertical span of rhenium mineralization outlined using the cutoff concentration (C Re = 0.5 g/t) is 42 m. The aureole of rhenium mineralization includes the aureoles of molybdenum and uranium mineralization, which indicates a geochemical similarity of U, Mo, and Re behavior in rocks and ores of the deposit ( Fig. 3 ; (Vikentyev and ...

Rhenium uptake and distribution in ...

2016-5-1 · 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 …(PDF) Measurements of rhenium isotopic composition in … · Rhenium concentration data from published work. 1,2,14,21 Figures - available via license: Creative Commons Attribution-NonCommercial 3.0 Unported Content may be …

Rhenium uptake and distribution in ...

2016-5-1 · 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 …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 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 …

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 …''C2020-8-6 · diffuses along grain boundaries into the iridium coating during high temperature operation, so that the concentration of rhenium at the inner surface slowly increases. Oxidation testing at 1500 ''C has shown that the iridium oxidation rate increases significantly above a rhenium concentration of 20 percent. Rhenium diffusion into iridium and

Rhenium uptake and distribution in phaeophyceae …

2018-10-29 · rhenium,macroalgae,uptake,distribution, phytomining,bioremediation Authorsforcorrespondence: ... different Re(VII) compound concentrations (0–7450ngg−1). A positive correlation is shown between the concentration ... Assuming that Re is being stored inside the macroalgae cells, a mechanism for Re uptake into the .. ternational Journal of Engineering TECHNICALstages was carried out by assuming constant stage efficiencies. A comparison of simulated and ... where C is the mg/L concentration of rhenium, and the subscripts, in and out, denote the inlet and ...

Measurements of rhenium isotopic composition in low ...

1999-6-24 · In addition, the strong dependence of rhenium concentration on chloride concentrations implies that molybdenite deposited from more saline fluids should tend to have higher rhenium concentrations than that precipitated from less saline fluids, assuming that both fluids are in equilibrium with similar rhenium sources. Thus, it is likely that ...The adsorption kinetics of nitrogen on rhenium - …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. The ...

Radioisotope Decay & Half-Lives: Rhenium-187 | Answers ...

2015-2-25 · Rhenium-osmium concentration and isotope systematics in group IIAB iron meteorites. Geochimica et Cosmochimica Acta 59, no. 11:2331–2344. Naldrett, S. N. 1958. Half-life of rhenium and ages of minerals. Annals of the …Unique Rhenium Deposit in the Carboniferous Coal …2020-7-12 · The maximum vertical span of rhenium mineralization outlined using the cutoff concentration (C Re = 0.5 g/t) is 42 m. The aureole of rhenium mineralization includes the aureoles of molybdenum and uranium mineralization, which indicates a geochemical similarity of U, Mo, and Re behavior in rocks and ores of the deposit ( Fig. 3 ; (Vikentyev and ...

Rhenium uptake and distribution in phaeophyceae …

2018-10-29 · rhenium,macroalgae,uptake,distribution, phytomining,bioremediation Authorsforcorrespondence: ... different Re(VII) compound concentrations (0–7450ngg−1). A positive correlation is shown between the concentration ... Assuming that Re is being stored inside the macroalgae cells, a mechanism for Re uptake into the ...Rhenium Solubility in Borosilicate Nuclear Waste Glass ...2012-8-13 · At higher rhenium concentrations, some additional material was retained in the glassesmore » Assuming justifiably substantial similarities between Re7 + and Tc 7+ behavior in this glass system, these results implied that the processing and immobilization of 99Tc from radioactive wastes should not be limited by the solubility of 99Tc in ...

Rhenium uptake and distribution in phaeophyceae …

2018-10-29 · rhenium,macroalgae,uptake,distribution, phytomining,bioremediation Authorsforcorrespondence: ... different Re(VII) compound concentrations (0–7450ngg−1). A positive correlation is shown between the concentration ... Assuming that Re is being stored inside the macroalgae cells, a mechanism for Re uptake into the ...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 …

Radioisotope Decay & Half-Lives: Rhenium-187 | Answers ...

2015-2-25 · Rhenium-osmium concentration and isotope systematics in group IIAB iron meteorites. Geochimica et Cosmochimica Acta 59, no. 11:2331–2344. Naldrett, S. N. 1958. Half-life of rhenium and ages of minerals. Annals of the …Rhenium–osmium systematics of the Mount Isa copper …2008-4-30 · The syn-tectonic breccia-hosted Mount Isa Cu deposit in northwest Queensland is the largest sediment-hosted Cu deposit in Australia. Whole-rock samples of chalcopyrite-rich Cu ore form an isochron with a Re–Os age of 1,372 ± 41 Ma. This age is more than 100 Ma younger than the previously accepted age of Cu ore formation, an Ar–Ar mineral age for biotite separated …

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

2015-10-1 · The concentration effect of the extractant was investigated within the range of 0.0047 to 0.094 mol·L − 1 for Cyanex 923 diluted in distilled kerosene. Varying concentrations of solvent were contacted in the unit phase ratio with the aqueous solution containing 1.07 g·L − 1 of rhenium in 2.0 mol·L − 1 of HCl. Rhenium extraction was found to increase from 4.9% to …Geochemistry of the redox-sensitive trace elements ...2021-12-5 · A ΣS-II concentration of 343 μmol kg −1 translates to a H 2 S concentration of 209 μmol kg −1, assuming the porewater pH is 6.6, which is nearly 5 times lower than the geochemical switch point for the conversion of WO 4 2− to WS 4 2− of approximately 1 mmol kg −1 (Mohajerin et al., 2014; Cui et al., 2020).

Radioactive rhenium complexed to 2-hydroxy isobutyric …

The final concentration of the reagents are rhenium 2×10-5 M, ethane dithiol 4×10-5 M (2×excess assuming 2 thiol molecules per 1 rhenium atom) isobutyric acid 1.4 molar and stannous chloride 3×10-3 M. After 1 hour from the pH adjustment, the sample was analyzed with HPLC with the use of a C-18 5 micron reverse phase column using 25% ...A first-principles model for anomalous segregation in ...2017-3-3 · In this section, to understand the anomalous segregation of rhenium occurring in W–Re alloys under irradiation condition, where alloys are not quenched from high temperatures but are irradiated at a constant temperature, we performed MC simulations at various temperatures assuming a certain concentration of vacancies and Re atoms.

HYDROTHERMAL TRANSPORT AND DEPOSITION OF …

Our results suggest that several processes should be effective in concentration and deposition of rhenium, including (1) mixing of the fluids containing rhenium with cooler, sulfide-rich solutions ...Rhenium‐osmium isotope systematics and platinum group ...2001-10-22 · Rhenium concentrations vary by nearly two orders of magnitude from 51 to 3588 pg/g, with an average/median value of 367/110 pg/g. Loess sample LO94 from Svalbard, characterized by high Os concentration, radiogenic 187 …

A standard stock solution of rhenium containing 1 mg …

2019-8-28 · rhenium and its separation from tungsten and other elements. The results are reported in this note., if NOTES A standard stock solution of rhenium containing 1 mg Re/ml was prepared by dissolving weighed amount of ''specpure'' potassium perrhenate (Johnson-Matthey). Lower concentrations at the Jo''gfmI level were made by suitable dilution ...Unique Rhenium Deposit in the Carboniferous Coal …2020-7-12 · The maximum vertical span of rhenium mineralization outlined using the cutoff concentration (C Re = 0.5 g/t) is 42 m. The aureole of rhenium mineralization includes the aureoles of molybdenum and uranium mineralization, which indicates a geochemical similarity of U, Mo, and Re behavior in rocks and ores of the deposit ( Fig. 3 ; (Vikentyev and ...

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 …Mobility of rhenium, platinum group elements and organic ...2002-5-15 · Rhenium redistribution along the weathering profile. Average original Re concentration (63 ng/g), approximated by the stippled line, is lower than the average Re concentration of apparently unweathered samples (88 ng/g, see Fig. 4d). The original Re concentrations for apparently unweathered samples are shown as small diamonds.

Rhenium-osmium isotope systematics and platinum …

2013-3-19 · Rhenium-osmium isotope systematics and platinum group element concentrations in oceanic crust Bernhard Peucker-Ehrenbrink1, Karen Hanghoj1,2, Tracy Atwood 1, and Peter B. Kelemen1,2 1Woods Hole Oceanographic Institution, 360 Woods Hole Road, MS 25, Woods Hole, Massachusetts 02543-1541, USAUnique Rhenium Deposit in the Carboniferous Coal …2020-7-12 · The maximum vertical span of rhenium mineralization outlined using the cutoff concentration (C Re = 0.5 g/t) is 42 m. The aureole of rhenium mineralization includes the aureoles of molybdenum and uranium mineralization, which indicates a geochemical similarity of U, Mo, and Re behavior in rocks and ores of the deposit ( Fig. 3 ; (Vikentyev and ...

(Electro‐)chemical Splitting of Dinitrogen with a Rhenium ...

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 .. ing SYBR Green - Working With SYBR Green - RheniumRhenium Tel: +972-8-955-8888 Fax: +972-8-996-9688 20 Hasatat, P.O.B 180, Modi''in 7171101, Israel