|3D model (Jmol)||Interactive image|
|E number||E930 (glazing agents, ...)|
|Molar mass||72.0768 g/mol|
|Appearance||white or yellowish powder|
|Melting point||~ 355 °C (671 °F; 628 K) (decomposes)|
Refractive index (nD)
|Lethal dose or concentration (LD, LC):|
LD50 (median dose)
| >5000 mg/kg (oral, rat) |
>10000 mg/kg (dermal, rat)
| Strontium peroxide|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|(what is ?)|
Calcium peroxide or Calcium dioxide (CaO2) is a solid peroxide with a white or yellowish color. For all practical purposes calcium peroxide is insoluble in water but will dissolve in acid to form hydrogen peroxide. When in contact with water it will immediately begin to decompose releasing oxygen.
Structure and stability
A theoretical study shows that the crystal structure of calcium peroxide is orthorhombic with space group Pna21, which explains the XRD spectrum excellently. First-principles calculations indicate that it is a stable compound against decomposition reaction: CaO2 → CaO + ½O2.
Calcium peroxide is manufactured to varying specifications and purity and can be used in different areas of industry and agriculture. In agriculture it is used as an oxygen fertilizer, and is also used in the presowing treatments of rice seed. Also, calcium peroxide has found use in the aquaculture industry as it is used to oxygenate and disinfect water, and in the ecological restoration industry as it is used in the treatment of soils. Calcium Peroxide is used in a similar manner to magnesium peroxide for environmental restoration programs. It is used to restore soil and groundwater contaminated with petroleum hydrocarbons by stimulating aerobic microbial degradation of the contaminants in a process known as Enhanced In-Situ Bioremediation.