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|Color:||Dark Gray Powder||MF:||Se|
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Factory Price Pharma Intermediate Selenium CAS 7782-49-2
|Other Name:||YEAST BOUND SELENIUM;WIENINGERS REAGENT;WIENINGER'S REAGENT;SELENIUM SINGLE ELEMENT STANDARD;SELENIUM STANDARD;SELENIUM STANDARD SOLUTION;SELENIUM PLASMA EMISSION SPECTROSCOPY STANDARD;|
|Leading time||within 24 hours upon receipt of payment|
|Delivery||Fast and secure shipping by EMS, DHL, TNT, FedEx, UPS|
|Package||Discreet and Hidden package according to specific requirement|
|Appearance||Dark gray powder|
|Certification||SGS, ISO 9001, KOSHER|
|Payment Terms||, Money Gram , T/T, Bitcoin|
|Minimum Order Quantity||10g|
1. Selenium is a chemical element with symbol Se and atomic number 34. It is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium. It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. Selenium was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element to the previously discovered tellurium (named for the Earth).
2. Selenium is found in metal sulfide ores, where it partially replaces the sulfur. Commercially, selenium is produced as a byproduct in the refining of these ores, most often during production. Minerals that are pure selenide or selenate compounds are known but rare. The chief commercial uses for selenium today are glassmaking and pigments.
3. Selenium is a semiconductor and is used in photocells. Applications in electronics, once important, have been mostly supplanted by silicon semiconductor devices. Selenium is still used in a few types of DC power surge protectors and one type of fluorescent quantum dot.
4. Selenium salts are toxic in large amounts, but trace amounts are necessary for cellular function in many organisms, including all animals. Selenium is an ingredient in many multivitamins and other dietary supplements, including infant formula. It is a component of the antioxidant enzymes glutathione peroxidase and thioredoxin reductase (which indirectly reduce certain oxidized molecules in animals and some plants). It is also found in three deiodinase enzymes, which convert one thyroid hormone to another. Selenium requirements in plants differ by species, with some plants requiring relatively large amounts and others apparently requiring none.
During the electro winning of manganese, the addition of selenium dioxide decreases the power necessary to operate the electrolysis cells. China is the largest consumer of selenium dioxide for this purpose. For every tonne of manganese, an average 2 kg selenium oxide is used.
The largest commercial use of Se, accounting for about 50% of consumption, is for the production of glass. Se compounds confer a red color to glass. This color cancels out the green or yellow tints that arise from iron impurities typical for most glass. For this purpose, various selenite and selenate salts are added. For other applications, a red color may be desired, produced by mixtures of CdSe and CdS.
Selenium is used with bismuth in brasses to replace more toxic lead. The regulation of lead in drinking water applications with the Safe Drinking Water Act of 1974 made a reduction of lead in brass necessary. The new brass is marketed under the name EnviroBrass. Like lead and sulfur, selenium improves the machinability of steel at concentrations around 0.15%. Selenium produces the same machinability improvement in copper alloys.
Copper indium gallium selenide is a material used in solar cells.
Small amounts of organoselenium compounds are used to modify the vulcanization catalysts for the production of rubber.
The demand for selenium by the electronics industry is declining, despite a number of continuing applications. Its photovoltaic and photoconductive properties are still useful in photocopying, photocells, light meters and solar cells. Its use as a photoconductor in plain-paper copiers once was a leading application, but in the 1980s, the photoconductor application declined (although it was still a large end-use) as more and more copiers switched to organic photoconductors. Though once widely used, selenium rectifiers have mostly been replaced (or are being replaced) by silicon-based devices. The most notable exception is in power DC surge protection, where the superior energy capabilities of selenium suppressors make them more desirable than metal oxide varistors.
Zinc selenide was the first material for blue LEDs, but gallium nitride is dominating the market now. Cadmium selenidewas an important component in quantum dots. Sheets of amorphous selenium convert X-ray images to patterns of charge in xeroradiography and in solid-state, flat-panel X-ray cameras. Ionized selenuium (Se+24) is one of the active mediums used in X-ray lasers.
Selenium is a catalyst in some chemical reactions, but it is not widely used because of issues with toxicity. In X-ray crystallography, incorporation of one or more selenium atoms in place of sulfur helps with multiple-wavelength anomalous dispersion and single wavelength anomalous dispersion phasing.
Selenium is used in the toning of photographic prints, and it is sold as a toner by numerous photographic manufacturers. Selenium intensifies and extends the tonal range of black-and-white photographic images and improves the permanence of prints.
|Check item||Specifications||Check conclusion|
|Appearance||Fine white or slightly yellow crystals||Conform|
|Loss on drying||≤0.5%||0.14%|
|Heavy metals as pb||≤0.001%||0.0007%|
|Residue on ignition||≤0.05%||0.02%|
|Solubility||1 g in 100 ml water (50ºC)or 50 ml 95% ethanol|
|Conclusion||The product has been conformed to FCC forth Edition|
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