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
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 |
