Molecular Formula | SeZn |
Molar Mass | 144.35 |
Density | 5.42g/mLat 25°C(lit.) |
Melting Point | 1100 °C |
Water Solubility | Insoluble in water. Decomposes in dilute nitric acid. |
Appearance | random pieces |
Specific Gravity | 5.42 |
Color | Yellow |
Exposure Limit | ACGIH: TWA 0.2 mg/m3NIOSH: IDLH 1 mg/m3; TWA 0.2 mg/m3 |
Solubility Product Constant(Ksp) | pKsp: 25.44 |
Merck | 14,10156 |
Sensitive | Air Sensitive |
Risk Codes | R23/25 - Toxic by inhalation and if swallowed. R33 - Danger of cumulative effects R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
Safety Description | S20/21 - S28 - After contact with skin, wash immediately with plenty of soap-suds. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S60 - This material and its container must be disposed of as hazardous waste. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
UN IDs | UN 3283 6.1/PG 2 |
WGK Germany | 3 |
TSCA | Yes |
HS Code | 28429090 |
Hazard Class | 4.3 |
Packing Group | III |
EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
Application | fluorescent material, semiconductor dopant |
production method | 1. A dilute solution of zinc sulfate buffered with ammonium acetate was added dropwise to a saturated solution of H2Se, while H2Se gas diluted with N2 or H2 (produced by reaction with Al2Se3 and dilute hydrochloric acid) was introduced into the solution. The vessel in which the precipitate was generated was heated on a steam bath and the excess H2Se gas was absorbed in a wash bottle containing concentrated nitric acid. If the introduction of the zinc salt solution is too fast or the concentration is too high, a white precipitate is formed, and it takes a long time to change to the yellow ZnSe. The yellow ZnSe precipitate was difficult to filter and required centrifugation; The separated precipitate was washed with boiled dilute aqueous ammonia and then with methanol. The washed ZnSe precipitate was dried in a vacuum dryer containing CaCl2, and then dried in a dryer containing P2O5 at 120 °c. Zinc selenide is very sensitive to air when it is wet. Therefore, the dried product should be placed in a glass tube and heated at 600 ° C. For 2-4H in H2 or H2Se atmosphere to remove the oxidized product. 2. The mixture of 4g of zinc oxide, 2.5g of zinc sulfide and 6g of selenium is placed in a quartz crucible with a lid and heated at 800 ° C. For 15min to obtain a ZnSe product. |
category | toxic substances |
toxicity grade | highly toxic |
flammability hazard characteristics | non-combustible; When heated and exposed to acid, highly toxic hydrogen selenide gas |
storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; It is stored and transported separately from acids and food |
extinguishing agent | carbon dioxide, dry powder, sand |
Occupational Standard | 0.2 mg (selenium)/m3 |