Selenium is an essential element in human body with potential antioxidant properties. Because of selenium's electronegativity and atomic radius, selenium-containing compounds exhibit unique bond energy (C-Se bond 244 kJ mol⁻¹; Se-Se bond 172 kJ mol⁻¹).
This page contains information on the chemical Selenium compounds including: 5 synonyms/identifiers; U.S. Code of Federal Regulations Title 49 Section 172 shipping regulations and 6 proper shipping names; USDOT 2008 Emergency Response Guidebook initial response information for 3 related materials.
Alkylation mercury compound Co-planer polychlorinated biphenyl Organotin compounds ... CFC-211 Mercury or Mercury compounds Selenium or Selenium compounds ... Cobalt or Cobalt compounds Organophosphorus compounds Note: All harmful materials must be disposed of properly per government regulatory requirements.
Selenium Sulfide is an orange-yellow powder that is soluble in carbon disulfide and practically insoluble in both water and organic solvents. Selenium sulfide is used as an ingredient in antidandruff shampoos and as a constituent of fungicides. When heated to decomposition, it emits toxic fumes of sulfur oxides and selenium.The primary routes of potential human exposure to selenium sulfide are ...
Selenium. Selenium is a non metallic chemical element, member of the group XVI of the periodic table. In chemical activity and physical properties it resembles sulfur and tellurium.Selenium appearsin a number of allotropic forms: the most popular are a red …
Volatile organic selenium compounds Organic selenium compounds and siUceous materials (rock, ore, concentrates) are fused with mixtures of sodium carbonate and various oxidants, eg, sodium peroxide, potassium nitrate, or potassium persulfate.For volatile compounds, this fusion is performed in a bomb or a closed system microwave digestion vessel. An oxidizing fusion usually converts selenium ...
Selenium. Selenium is a non metallic chemical element, member of the group XVI of the periodic table. In chemical activity and physical properties it resembles sulfur and tellurium.Selenium appearsin a number of allotropic forms: the most popular are a red amorphous powder, a red crystalline material, and a gray crystalline metallike form called metallic selenium.
Besides in the form of selenoproteins, Se can exist in many different chemical forms in biological materials either as organic Se compounds, such as selenomethionine and dimethylselenide, and inorganic selenites and selenates. In foods, Se is predominantly present as selenomethionine, which is an important source of dietary Se in humans, and ...
Selenium compounds can trap free radicals, thereby converting them into stable compounds. For human beings, selenium is an essential element, that plays a major role in many physiological and biochemical processes. Selenium compounds are readily absorbed through the digestive tract and respiratory system, and selenyl chloride enters through the ...
Selenium was discovered by Jöns Jacob Berzelius, a Swedish chemist, in 1817 after analyzing an impurity that was contaminating the sulfuric acid (H 2 SO 4) being produced at a particular factory in Sweden.Originally believing the material was tellurium, Berzelius eventually realized that it was actually a previously element.
Selenium Compounds (Click These Boxes to See the Product Pages) SeO2. Selenium dioxide. Na2SeO3. Sodium selenite. ZnSeO3. Zinc selenite. Na2SeO4. Sodium selenate. Vital Materials is one of the top Zinc Selenite manufacturers and provides a full range of other minor metal compounds. We can customize the purity, composition and forms for ...
selenium-enriched yeast preparations which could be used and the range of selenium compounds they may contain, and differences in the way in which the body handles organic compared with inorganic forms, have been addressed via the additional data considered in this opinion.
To exploit the plant byproducts from selenium (Se) biofortification and reduce environmental risk of inorganic Se fertilizer, pot experiment was conducted in this study. The effects of Se-enriched wheat (Triticum aestivum L.) straw (WS + Se) and pak choi (Brassica chinensis L.) (P + Se) amendment on …
Many photocell applications using selenium have been replaced by other devices using materials more sensitive, more readily available, and more easily fabricated than selenium. Compounds. In its compounds selenium exists in the oxidation states of −2, +4, and +6. It manifests a distinct tendency to form acids in the higher oxidation states ...
selenide), organic selenium, and all forms of selenium found in the environment . The selenium assessment encompasses all 29 selenium-containing substances on the Domestic Substances List (DSL), including those that met categorization criteria. All selenium compounds that have the potential to transform, dissolve, dissociate and/or
Vital Materials is a selenium metal manufacturer producing in various shapes and sizes, from powder to pellets to ingots and a wide range of purity from 99.5% to 99.999% depending on customer's requirement and specification. Vital Materials also produces chemicals and compounds derived from selenium such as selenium dioxide, sodium selenite ...
1997), while selenate is the most mobile of selenium compounds because of its high water solubility and inability to adsorb to soil particles (ATSDR 1996). Alkaline soils formed from parent materials high in selenium are also high in biologically available selenium (Mayland et al., 1989).
Selenium Description. Selenium is a nonmetallic element with an atomic number of 34 and an atomic weight of 78.96. Its chemical symbol is Se. Selenium is most commonly found in nature in its inorganic form, sodium selenite. An organic form of selenium, selenomethionine, is found in foods.
Further testing of inorganic selenium compounds demonstrated that the inorganic selenium compounds selenite and selenium dioxide, and the organic diselenide of the composition RSeSeR reacts with thiols, such as glutathione, cysteine and dithiothreitol, and generated superoxide and hydrogen peroxide.
Selenium | Stanford Advanced Materials. Selenium is a semimetal that can exist in two forms: as a silvery metal or as a red powder The biggest use of selenium is as an additive to glass Some selenium compounds decolourise glass, while others give a deep red colour Selenium can also be used to reduce the transmission of sunlight in architectural glass, giving it a bronze tint Selenium is used ...
Species-selective determination of selenium compounds in biological materials (Technical Report) Abstract: There is substantial evidence of the complexity of selenium speciation in living organisms and of the importance of the selective determination of the particular species of this element in order to understand its metabolism and
Selenium and its compounds can be used in plastics (as a component of pigments), rubber (accelerator in rubber vulcanization), agriculture (soil supplement, animal feed, and pesticides), paints (as a component of pigments), ceramics and glass (as a component of pigments), electronic material, drugs including natural health products (as a ...
Contributions also describe the theoretical and spectroscopic studies of selenium and tellurium compounds. Additionally, this monograph outlines the applications of selenium and tellurium in biological systems, materials science and as reagents in organic synthesis and shows how these applications have been a fundamental driving force behind ...
Selenium compounds are considered hazardous materials, and special requirements have been set for marking, labeling, and transporting these materials. Environmental Protection Agency (EPA) Clean Air Act National Emission Standards for Hazardous Air Pollutants: Selenium compounds are listed as hazardous air pollutants. Clean Water Act
Selenium | Se | CID 6326970 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. COVID-19 Information. Public health information (CDC) Research information (NIH) SARS-CoV-2 data (NCBI) Prevention and treatment ...
SELENIUM viii . Managing Hazardous Materials Incidents. is a three-volume set of recommendations for on-scene ... exclusion, exists as part of the administrative record for this compound. A list of databases reviewed and a list of unpublished documents cited are also included in the administrative record.
Selenium is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity). Elemental or metallic forms include pellets, rod, wire and granules for evaporation source material purposes. Selenium oxide is available in powder and dense pellet form for such uses as optical coating and thin film applications.
Some selenium-containing compounds have already been reported to show a therapeutic effect on cardiovascular disease, diabetes, and cancer. 28 However, there is still no selenium-containing anticancer drug in clinical applications. In this review, we summarize the recent advances in selenium-containing nanomaterials for cancer treatment.
In the human diet, selenium is present mainly in organic compounds, as L-selenomethionine and L-selenocysteine, with lower amounts in inorganic compounds, as selenate and selenite. The EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA) set in 2014, adequate intake (AI) values for selenium in the range of 15 lg/day for children aged ...
These high-purity selenium compounds have been replaced by organic photoreceptor compounds that do not have the environmental concerns involved with the disposal of selenium compounds. Today, selenium is used in glass and metal production and electronic applications such as solar cells. Selenium with bismuth is also a substitute in brass ...
The presently disclosed subject matter provides processes for preparing nanocrystals, including processes for preparing core-shell nanocrystals. The presently disclosed subject matter also provides sulfur and selenium compounds as precursors to nanostructured materials. The presently disclosed subject matter also provides nanocrystals having a particular particle size distribution.
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