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Selenium

Selenium structure

CAS No:
7782-49-2
Formula:
Se
Chemical Name:
Selenium
Synonyms:
Selenium;C.I. 77805;B-TRAXIM Se;Selenium (Se);Selsaf 2000;Serendipita MKCA6-3;95788-45-7;11125-23-8;11133-88-3;12640-29-8;12640-30-1;12641-96-2;12733-65-2;37256-19-2;37258-85-8;37276-15-6;37368-02-8;50954-17-1;51882-60-1
Categories:
Inorganic Chemistry > Elementary Substance

Description

Selenium is a nonmetal (or semimetallic) element (also referred to as a metalloid). It belongs to Group 16 (Group VIA) of the periodic table, located between sulfur and tellurium.

The chemical properties of selenium are similar to sulfur. Selenium combines with metals and many nonmetals directly or in aqueous solution. It does not react directly with hydrogen fluoride or hydrogen chloride but decomposes hydrogen iodide to liberate iodine and yield hydrogen selenide. The selenides r

Selenium Basic Attributes

Molecular Weight：

78.96

Exact Mass：

79.917

EC Number：

231-194-7

HScode：

28049090

Characteristics

PSA：

XLogP3：

Appearance：

White to creamy white powder

Density：

4.8 g/cm³

Melting Point：

170-217 °C

Boiling Point：

685 °C

Water Solubility：

H2O: Insoluble

Storage Conditions：

Storage temperature: no restrictions.

Vapor Pressure：

<1 Pa (20 °C)

Toxicity：

Intravenous-rat LD50: 6 mg/kg; inhalation-rat LDL0: 33 mg/m3/8 hours

Flammability characteristics：

Combustible at high temperature; selenium oxide fumes are released in the fire

Explosive limit：

During attempted conversion of recovered selenium metal to the dioxide by heating in oxygen, a vigorous explosion occurred. This was attributed to selenium-catalysed oxidation traces of organic impurities in the selenium. Oxidation of recovered selenium with nitric acid is rendered vigorous by presence of organic impurities, but is a safe procedure.

Safety Information

Packing level：

III

Hazard category：

Transport codes：

UN 3440 6.1/PG 3

wgk germany：

hazard class code：

36/38-53-33-23/25

safety instructions：

26-61-45-28-20/21-28A

RTECS Number：

VS7700000

Marks：

Storage features：

The warehouse is ventilated, low temperature and dry; stored separately from acids, alkalis, food additives

Stability/Shelf Life：

Stable. Incompatible with strong acids, strong oxidizing agents and most common metals. Combustible.

Precautionary statement(s)：

P260, P261, P264, P270, P271, P273, P301+P310, P304+P340, P311, P314, P321, P330, P403+P233, P405, P501

Hazard Statements：

H301

Toxicity

Toxicity class：

most toxic

Selenium Use and Manufacturing

Methods of Manufacturing

Using metallic selenium as raw material, it is refined after regional melting, and the purity of high-purity selenium is 99.999%.

Uses

Catalyst for Kjeldahl nitrogen determination, inorganic dehydrogenation agent. It is used for manufacturing semiconductor materials, photometers, photocells and other optical instruments, rectifiers, selenium photosensitive plates, copying toner cartridges, alloys, enamels and glass. Used for ICP-AES, AAS, AFS, ICP-MS, ion chromatography, etc. Standard solution for titration analysis. Calibration instruments and devices; evaluation methods; working standards; quality assurance/quality control; others.

Material

Hydrochloric acid

Sodium sulfite

Downstream Products

Ammonia

Related Drugs

Sanyezhen brand propolis selenium soft capsule
Specifications	500 mg/tablet

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Specifications	1.3g/tablet

Zinc-Selenium Tablets (Original Name: Body Gold)

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Registered Holders

GENERAL ELECTRIC CO

United States
Inactive

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