• Osmium

    Osmium (from Greek ὀσμή osme, "smell") is a chemical element with the symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Osmium is the densest naturally occurring element, with an experimentally measured (using x-ray crystallography) density of 22.65 g/cm 3.

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  • Mineral Commodity Summaries

    Mineral Commodity Summaries. Published on an annual basis, this report is the earliest Government publication to furnish estimates covering nonfuel mineral industry data. Data sheets contain information on the domestic industry structure, Government programs, tariffs, and 5-year salient statistics for over 90 individual minerals and materials.

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  • Radionuclides | NRC.gov

     · Rhenium-177 Rhenium-178 Rhenium-181 Rhenium-182 (12.7 h) Rhenium-182 (64.0 h) Rhenium-184 Rhenium-184m Rhenium-186: Rhenium-186m Rhenium-187 Rhenium-188 Rhenium-188m Rhenium-189 Rhodium-99 Rhodium-99m Rhodium-100 Rhodium-101 Rhodium-101m Rhodium-102 Rhodium-102m Rhodium-103m Rhodium-105 Rhodium-106m Rhodium-107: Rubidium …

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  • Radioisotopes in Medicine | Nuclear Medicine

    Rhenium-186 (3.8 d): Used for pain relief in bone cancer. Beta emitter with weak gamma for imaging. Rhenium-188 (17 h): Used to beta irradiate coronary arteries from an angioplasty balloon. Samarium-153 (47 h): Sm-153 is very effective in relieving the pain of secondary cancers lodged in …

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  • Rhenium

    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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  • Chem 101B Study Questions

    2. An unstable isotope of rhenium, 191Re, has a half-life of 9.8 minutes and is a beta producer. What is the other product of the reaction? A) 191Os B) 191W C) 192Pt D) 190W E) 190Os 3. It is desired to determine the concentration of arsenic in a lake sediment sample by means of neutron activation analysis. The nuclide 75 33As captures a ...

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  • Rad Pro Calculator: Free Online Radioactive Isotopes Decay ...

    Useful for calculating today''s activity for any radioactive isotope. You may also back decay sources to find out the original activity (or for any date), knowing the current activity. If the isotope that you wish to decay is not on the drop down list, check the ''not listed'' check …

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  • Bromate in Drinking Water

    Bromate is formed when ozone used to disinfect drinking water reacts with naturally occurring bromide found in source water. Bromate formation in disinfected drinking water is influenced by factors such as bromide ion concentration, pH of the source water, the amount of ozone and the reaction time used to disinfect the water.

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  • Reading: Abundance of Elements in Earth''s Crust | Geology

    Reading: Abundance of Elements in Earth''s Crust. The table shows the abundance of elements in Earth''s crust. Numbers show percentage or parts per million (ppm) in mass; 10,000 ppm = 1%. Note that numbers are estimates, and they will vary depending on source and method of estimation. Order of magnitude of data can roughly be relied upon.

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  • MATSE 259 Solutions to homework #2 1. ca

    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. This problem asks that we calculate the unit cell volume, V C, for Re which has an HCP crystal structure. Now, C = c ×V base area, and the base area has been calculated in Problem 2 above as 6R2 3 . Thus,

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  • Critical Materials Rare Earths Supply Chain: A Situational ...

    The assured supply of critical materials Figure 1. Methodology for Critical and the resiliency of their supply chains are essential to the economic prosperity and

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  • Antimony Compounds

    The concentration of antimony in ambient air ranges from less than 1 nanogram per cubic meter (ng/m 3) (0.000001 milligram per cubic meter [mg/m 3]) to about 170 ng/m 3 (0.000170 mg/m 3). However, near factories that convert antimony ores into metal, or make antimony oxide, concentrations may be greater than 1,000 ng/m 3 (0.01 mg/m 3). (1)

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  • Rhenium

    Rhenium Powder. Rhenium is one of the most rare elements in the earth''s crust, with an average concentration of 1 part per billion! Rhenium is most often used in high temperature superalloys...

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  • Secondary Ion Mass Spectrometer (SIMS)

     · As a class, SIMS instruments (aka ion microprobes) use an internally generated beam of either positive (e.g., Cs) or negative (e.g., O) ions (primary beam) focused on a sample surface to generate ions that are then transferred into a mass spectrometer across a high electrostatic potential, and are referred to as secondary ions.

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  • Density of Rhenium in 285 units and reference information

    Rhenium weighs 21 gram per cubic centimeter or 21 000 kilogram per cubic meter, i.e. density of rhenium is equal to 21 000 kg/m³; at 25°C (77°F or 298.15K) at standard atmospheric pressure . In Imperial or US customary measurement system, the density is equal to 1 310.99 pound per cubic foot [lb/ft³], or 12.14 ounce per cubic inch [oz/inch³] .

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  • Learn About Rhodium, a Rare Platinum Group Metal

     · Rhodium is a hard, silver-colored metal that is very stable and has a high melting point. Rhodium metal is resistant to corrosion and, as a PGM, it shares the group''s exceptional catalytic properties. The metal has a high reflectance, is hard and durable, and has both a low electrical resistance as well as a low and stable contact resistance.

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  • Pourbaix diagram

    Pourbaix diagram of iron. In electrochemistry, and more generally in solution chemistry, a Pourbaix diagram, also known as a potential/pH diagram, EH–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 ...

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  • Phosphorus

    The CalEPA reference exposure level is a concentration at or below which adverse health effects are not likely to occur. (9) ATSDR has calculated an acute inhalation minimal risk level (MRL) of 0.02 mg/m 3 for white phosphorus smoke based on respiratory effects in humans. The MRL is an estimate of the daily human exposure to a

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  • rhenium powder | Sigma-Aldrich

    Search results for rhenium powder at Sigma-Aldrich. Changes will be taking place on SigmaAldrich on June 5, 2021 that include visual and functional updates.

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  • An Atomic-Absorption Method for the Determination of Gold ...

    to concentration as directed for the parti­ cular instrument. The gold content, in parts per million, of the sample is equal to: ~-tg/ml X ( ml MIBK + ml ethyl ether) 100 2 PREPARATION OF STANDARDS Add respectively 5, 25, 50, and 100 1-tg of gold to four 100-ml volumetric flasks containing 25 ml 1.5 N HBr. Add 50 ml MIBK and shake the

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  • Radioactivity and Balancing Nuclear Reactions: Balancing ...

    (Rhenium-185 is a stable isotope.) Rhenium-188 is a radioisotope for treatment of cancer. a. α d. γray b. β e. X-ray c. positron 35. Fact: 63Zn is unstable and radioactive. Is its n/p ratio too high or too low? Which process could lead to stability? (Make sure that both parts of the answer are correct.)

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  • Rhenium

    Such elements are potassium, rubidium, samarium, lutetium, rhenium, and uranium. In these concentration measurements, the activity of the radioactive isotopes is measured. When the relative abundance of the radioactive isotopes is known, the quantity of the element that is present can be calculated from Eq.

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  • Insulin-Transferrin-Selenium (ITS -G) (100X)

    Gibco Insulin-Transferrin-Selenium (ITS-G) is used as a basal medium supplement in order to reduce the amount of fetal bovine serum (FBS) needed to culture cells. Originally used with RPMI 1640 and Minimum Essential Medium (MEM), ITS-G solution is now …

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  • The elements of the periodic table sorted by elements in ...

    Lenntech (European Head Office) Distributieweg 3 2645 EG Delfgauw The Netherlands Phone: +31 152 610 900 fax: +31 152 616 289 e-mail: [email protected] Lenntech USA LLC (Americas)

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  • The Parts of the Periodic Table

    Rhenium was discovered by Walter Noddack, Otto Berg, and Ida Tacke in 1925, as a trace element in columbite, gadolinite, molybdenite and platinum ores. It was the last of the naturally occurring elements to be discovered, in part because of its extremely low concentration in the Earth''s crust and because it is not concentrated in any unique ...

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  • 4.4: UV-Visible Spectroscopy

     · The UV-vis region of energy for the electromagnetic spectrum covers 1.5 - 6.2 eV which relates to a wavelength range of 800 - 200 nm. The Beer-Lambert Law, Equation 4.4.1, is the principle behind absorbance spectroscopy. For a single wavelength, A is absorbance (unitless, usually seen as arb. units or arbitrary units), ε is the molar ...

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  • Fluorescence Excitation and Emission Fundamentals

    Fluorescence Excitation and Emission Fundamentals Fluorescence is a member of the ubiquitous luminescence family of processes in which susceptible molecules emit light from electronically excited states created by either a physical (for

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  • Transition metal

    Transition metal - Transition metal - Discovery of the transition metals: The most abundant transition metal in Earth''s solid crust is iron, which is fourth among all elements and second (to aluminum) among metals in crustal abundance. The elements titanium, manganese, zirconium, vanadium, and chromium also have abundances in excess of 100 grams (3.5 ounces) per ton.

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  • chem exam Flashcards | Quizlet

    The concentration of a solute in a saturated solution is called the solubility of the solute. If a solubility of an ionic compound > 0.1 M, the compound is soluble.If a solubility of an ionic compound < 1 × 10-3 M, the compound is insoluble. ... The atomic mass of rhenium is 186.2. Given that 37.1% of natural rhenium is rhenium-185, what is ...

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  • Ion exchange regeneration methods

    H 2 SO 4: for SAC resins, the acid concentration must be carefully selected between 0.7 and 6 % as a function of the proportion of calcium in the feed water (which is the same in the SAC resin). For WAC resins, the concentration is usually 0.7 %. Too high a concentration may …

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  • Periodic Table

    28 Ni Nickel 58.693. 29 Cu Copper 63.546. 30 Zn Zinc 65.38. 31 Ga Gallium 69.723. 32 Ge Germanium 72.630. 33 As Arsenic 74.922. 34 Se Selenium 78.971.

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  • Rhenium

    Concentration of Rhenium per GRapi unit = 25.56 (PPM) Rhenium is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram. Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 777.38 ±194.35 grams of pure Rhenium .

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  • Composition of seawater

    But the concentration of Ca (411ppm) is 10.4 mmol/l and that of all CO2 species (90ppm) 2.05 mmol/l, of which CO3 is about 6%, thus 0.12 mmol/l. Thus the sea has a vast oversupply of calcium. [1] Report of the Royal Society (June 2005): Ocean acidification due to increasing atmospheric carbon dioxide .

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  • Rhenium minerals

    Rhenium is mainly obtained as a by-product of the extraction and refinement of molybdenum and copper ores. The main source of rhenium is molybdenum concentrates (rhenium content 0.01-0.04%; 2-20 to 200-300 g /t). Currently, the industrial source of rhenium is also the waste water of hydrometallurgical processing of poor molybdenite concentrates.

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  • Rhenium Statistics and Information

    Rhenium (Re), the last naturally-occurring element to be discovered, was discovered in Germany in 1925. The process was so complicated and the cost so high that production was discontinued until early 1950 when tungsten-rhenium and molybdenum-rhenium alloys were prepared. These alloys found important applications in industry that resulted in a great demand for the rhenium

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