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A7281112

Selenium , ≥99.99%metalsbasis, ≥200 , 7782-49-2

Synonym(s):
SE000500;SE006010;SE006110;Selenium;Selenium black 99+

CAS NO.:7782-49-2

Empirical Formula: Se

Molecular Weight: 78.96

MDL number: MFCD00134090

EINECS: 231-957-4

Update time: 2022-07-08

PRODUCT Properties

Melting point: 217 °C (lit.)
Boiling point: 684.9 °C (lit.)
Density  4.81 g/mL at 25 °C (lit.)
vapor pressure  <1 Pa (20 °C)
storage temp.  no restrictions.
solubility  H2O: soluble
form  powder
Specific Gravity 4.81
color  White to creamy white
Resistivity 1.2 μΩ-cm, 0°C
Water Solubility  Insoluble
Merck  13,8505
Exposure limits TLV-TWA 0.2 mg(Se)/m3 (ACGIH, MSHA, and OSHA); IDLH 100 mg/m3.
Dielectric constant 6.1(Ambient)
Stability: Stable. Incompatible with strong acids, strong oxidizing agents and most common metals. Combustible.
InChIKey SPVXKVOXSXTJOY-UHFFFAOYSA-N

Description and Uses

Selenium was discovered in 1817 by J?ns Jacob Berzelius. Especially noted was the similarity of the new element to the previously known tellurium. Selenium is an essential trace element atw0.1 ppm in diets. Selenium is a biologically active part of a number of important proteins, particularly enzymes involved in antioxidant defense mechanisms, thyroid hormone metabolism, and redox control of intracellular reactions. In humans and animals, selenium plays a role in protecting tissues from oxidative damage as a component of glutathione peroxidase.

selenium is a trace mineral used for years in topical preparations for its anti-fungal properties. Selenium has been shown to have other protective effects such as repairing DnA, reducing the DnA-binding of carcinogens, and suppressing gene mutations. In laboratory studies, skin lotions containing selenium compounds have been shown to decrease uV-induced skin damage such as inflammation, blistering, and pigmentation.

Safety

Symbol(GHS) 
GHS06,GHS08
Signal word  Danger
Hazard statements  H301+H331-H373-H413
Precautionary statements  P260-P264-P273-P301+P310-P304+P340+P311-P314
Hazard Codes  T
Risk Statements  36/38-53-33-23/25
Safety Statements  26-61-45-28-20/21-28A
RIDADR  UN 3440 6.1/PG 3
OEB C
OEL TWA: 0.2 mg/m3 [*Note: The REL also applies to other selenium compounds (as Se) except Selenium hexafluoride.]
WGK Germany  2
RTECS  VS7700000
TSCA  Yes
HazardClass  9
PackingGroup  III
HS Code  28049090
Toxicity LD50 orally in Rabbit: 6700 mg/kg
IDLA 1 mg Se/m3

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