SE2821 Selenium Powder (Se Powder) (CAS 7782-49-2)

Catalog No. SE2821
Molecular Formula Se
CAS Number 7782-49-2
Appearance Gray to black powder
Purity 99.99%

Selenium Powder (CAS 7782-49-2) is gray to black powder, soluble in concentrated sulfuric acid and chloroform, slightly soluble in carbon disulfide, insoluble in water and ethanol. Stanford Advanced Materials (SAM) offers high-quality Selenium Powder.

Related products: Copper (I) Selenide Powder, Cadmium Selenide Powder, Bismuth (III) Selenide Powder, Sodium Selenite Powder.

 

Selenium Powder Description

Selenium Powder (CAS 7782-49-2) is nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur, and tellurium, and also has similarities to arsenic. 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.

 

Selenium Powder Specifications

Product Name

Selenium Powder (Se Powder)

CAS Number

7782-49-2

Molecular formula

Se

Molecular weight

78.96

Density

4.79 g/cm3

Melting point

221 °C, 430 °F

Boiling point

685 °C, 1265 °F

 

Safety Information

Signal word

Danger

Hazard statements

H301 + H331 - H373 - H413

Precautionary statements

P260 - P264 - P273 - P301 + P310 + P330 - P304 + P340 + P311 - P403 + P233

Personal protective equipment

Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges

RIDADR

UN3288 - class 6.1 - PG 3 - EHS - RQ - Toxic solid, inorganic, n.o.s., HI: all

WGK Germany

WGK 2

 

Selenium Powder Application

Fertilizers

Researchers found that the application of selenium fertilizer to lettuce crops decreased the accumulation of lead and cadmium. Peaches and pears given a foliar selenium spray contained higher levels selenium and also stayed firm and ripe longer when in storage.

Manganese electrolysis

During the electrowinning 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 of 2 kg selenium oxide is used.

Glass production

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 the 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.

Alloys

Selenium is used with bismuth in brasses to replace more toxic lead. The regulation of lead in drinking water applications such as in the US 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.

Lithium–selenium batteries

The lithium–selenium (Li–Se) battery is one of the most promising systems for energy storage in the family of lithium batteries. The Li–Se battery is an alternative to the lithium–sulfur battery, with an advantage of high electrical conductivity.

Photoconductors

Amorphous selenium (α-Se) thin films have found application as photoconductors in flat panel x-ray detectors. These detectors use amorphous selenium to capture and convert incident x-ray photons directly into electric charge.

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