- Selenium is a
chemical element with the atomic number 34, represented by the chemical
symbol Se.
- Selenium is a trace
mineral that is essential to good health but required only in small
amounts .
- Selenium is found in
economic quantities in sulfide ores such as pyrite, partially replacing
the sulfur in the ore matrix.
- Selenium has a
biological role, and is found in organic compounds such as dimethyl
selenide, selenomethionine, selenocysteine and methylselenocysteine.
- Selenium occurs in
staple foods such as corn, wheat, and soybean as selenomethionine, the
organic selenium analogue of the amino acid methionine
- Selenium is most
commonly produced from selenide in many sulfide ores, such as those of
copper, silver, or lead.
- It is obtained as a
byproduct of the processing of these ores, from the anode mud of copper
refineries and the mud from the lead chambers of sulfuric acid
plants.
- The maximum
acceptable concentration of
selenium in drinking water is 0.01
mg/L.If selenium is
present at this level, drinking water would be
the source
of between 10 and 25 percent of total selenium
intake.
- Steps involved in
the extraction of Selenium are : Soda Ash Roasting, Sulfation Roasting,
Wet Chlorination, Copper-Lead Slimes Treatment.
- The largest use of
selenium world-wide is in glass and ceramic manufacturing, where it is
used to give a red color to glasses, enamels and glazes as well as to
remove color from glass by counteracting the green tint imparted by
ferrous impurities.
- It is used in many
applications, the major ones being a decolorizer for glass, a
metallurgical additive to free-machining varieties of ferrous and
nonferrous alloys, a constituent in cadmium sulfoselenide pigments, a
photoreceptor in xerographic copiers, and a semiconductor in electrical
rectifiers and photocells.
- Use of selenium as a
promoter in the reformation of naphtha.
- The major consumers
of selenium in order of importance are Europe, United State and
Asia-Pacific, with the latter having the highest rate.
- The demand for
selenium, however, is more influenced by the technological requirements
of its end uses and by costs associated with its use as compared with
substitute materials than with its initial cost.
- Selenium has
also
been shown to be teratogenic in a number of avian and mammalian species
(a subject extensively reviewed
by the U.S. National Academy of
Sciences(21)), and there
have been suggestions that selenium may also
be a
teratogen in humans.
- Chinese demand for
selenium is expected to increase owing to a potential expansion of
demand from a rise in manganese production, in which selenium is
used.
- The minimum toxic
intake
level has been identified for adults as 0.5 to 0.7
mg/day,
and daily intakes of less than 0.02 or 0.03 mg may also be
linked to adverse health effects.
- Global demand for
selenium from the glass and solar cell manufacturers should also
increase as there are few substitutes in glass manufacturing and the
expansion of solar cell production is expected to continue.
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General
- Selenium
- Selenium Element
Facts
- Element Selenium –
Se
- Dietary Supplement
Fact Sheet: Selenium
- History About
Selenium
- Selenium, Background
And Its Evidence
Application
- Selenium
Applications
- Selenium And Its
Effects On Growth, Yield And Tuber Quality In Potato
- Selenium
Fertilization To Prevent Selenium Deficiency
- The Preparation Of
Optically Clear Selenium For Use In Index Media
- The use of selenium
containing intermediates to mediate or catalyze new organic
reactions
- A New Method for the
Synthesis of Selenium Nanoparticles and the Application to Construction
of H2O2 Biosenso
Technology
- The green technology
of selenium phytoremediation
- The real-time
amorphous selenium (α-Se) Flat Panel Detector (FPD) technology
overview
- Advanced Biological
Metals Removal Process
- SeLECT™
Technology
- The selenium
technology
Process
- Selenium From Coal
Mining In The ELK River Valley
- Determination
Of Impurities In High-Purity Selenium By Inductively Coupled
Plasma Mass Spectrometry After Matrix Separation With
Thiourea
- Extraction &
Purification Of Selenium
Project
- High Selenium Pinto
Beans As A Value Added Product
- Prevention of Cancer
by Selenium
- Relationship Between
Soil Selenium Concentrations And Selenium Uptake By Vegetation On
Surface Coal Mine Lands In Wyoming
- Site-Specific Water
Quality Criteria for Selenium: Development of Implementation Analysis
Protocol
- Selenium
Treatment/Removal Alternatives Demonstration Project
Hazards
- Environmental
effects of selenium
- Selenium Hazard
Summary
- Selenium Impacts on
Fish: An lnsidious Time Bomb
- Recommendations for
Pre-Mine Assessment of Selenium Hazards Associated With Coal
Mining
Properties
- Selenium Chemical
& Physical Properties
- Chemical &
Physical Information
- Physical Properties
Of Selenium
- Synthesis, structure
and physical properties of the new selenium containing
metal complex
NBu4[Ni(ddds)2
- Properties Of
Selenium
- Selenium
- Thermal Properties
Of Selenium -Bismuth Glassy Alloys
Market
- Selenium Production
In The Year 2005
- Selenium Production
In The Year 2006
- Market For
Selenium
- Selenium Market
Overview
- Selenium Market
outlook
- Selenium Prices and
Stock
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Company
- Company In United
States
- Company In
Japan
- Company In
Japan
- Company In
China
- Company In United
States
Consultant
- Consultant From
United Kingdom
- Consultant From
United States
- Consultant From
United States
- Consultant From
United States
- Consultant From
United States
Product
- Selenium
Products
- Product List Of
Selenium
- Selenium Info And
Products
- Selenium 74
Suppliers
- Selenium
Manufacturers And Suppliers
- Selenium
Manufacturers
- Selenium Buyers,
Manufacturers & Suppliers
- Selenium Buyers,
Manufacturers & Suppliers
- Selenium Exporters,
Manufacturers, & Suppliers
- Selenium Exporters,
Manufacturers, & Suppliers
Patent
- Control Of Selenium
Alloy Fractionation
- Electrphoretic
Deposition Of Selenium
- Electroded Selenium
Lamp
- Method Of Selenium
Removal
- Preparation Of Red
Amorphous Selenium
- Process For Selenium
Purification
- Removal Of Selenium
From Acidic Copper/Nickel Solutions
- Use Of Selenium For
Treating Patients Suffering From Systemic Inflammatory Response Syndrome
And Composition For implementing Said Treatment
Report
- Selenium
Contamination in Corbicula Transplanted into Agricultural
Drains
- An integrated
investigation of anthropogenic selenium contamination in Lake Macquarie,
NSW
- Acute Feed-Related
Selenium Toxicosis In Weaner Pigs
- Selenium Danger
Ignored
- Traditional
Microbial-Extraction of Essential Selenium from Tea Epiphytic-Parasitic
Medicinal Plants Used by the People
- Selenium reduction
through wise water use
- Setting requirements
and recommended intakes of selenium
- Report About
Selenium
- Biological
Assessment of Existing TMDL Stream
Survey Report
- Selenium Production
In The Year 2008
- Selenium End-Use
Statistics
- Selenium End-Use
Statistics US Geological Survey
- Selenium Production
In The Year 2004
- Selenium Production
In The Year 2006
- Selenium Production
In The Year 2007
- Selenium and
Tellurium
Material Safety Data
Sheet
- Selenium
- Selenite
Broth
- Dimethyl
Selenium
- Selenium
hexafluoride
- Zinc
Selenide
- Selenium
- Tungsten
Selenide
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