Krypton is present in the air at about 1 ppm. The atmosphere of Mars contains a little (about 0.3 ppm) of krypton. It is characterised by its brilliant green and orange spectral lines.
Under normal conditions krypton is colourless, odourless, fairly expensive gas. Solid krypton is a white crystalline substance with a face-centered cubic structure which is common to all the "rare gases". Krypton difluoride, KrF2.
Krypton is present to a small extent (about 1 ppm by volume) in the atmosphere and is obtained as a byproduct from the liquefaction and separation of air. This would not normally be carried out in the laboratory and krypton is available commercially in cylinder.
Product | Denomination | Standard articles | Impurities, no more | Total impurities, no more | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Krypton | Kr 5.0 UHP | Kr | ≥ | 99.999 | vol.% | Xe | ≤ | 3 | ppm | ≤ | 10 | ppm |
- | N2 | ≤ | 3 | ppm | - | - | - | |||||
- | Ar | ≤ | 1 | ppm | - | - | - | |||||
- | H2 | ≤ | 0.1 | ppm | - | - | - | |||||
- | O2 | ≤ | 1 | ppm | - | - | - | |||||
- | CF | ≤ | 0.1 | ppm | - | - | - | |||||
- | THC | ≤ | 0.5 | ppm | - | - | - | |||||
- | CO | ≤ | 0.5 | ppm | - | - | - | |||||
- | CO2 | - | - | - | - | - | - | |||||
- | H2O | ≤ | 1 | ppm | - | - | - | |||||
Krypton | Kr 5.5 UHP | Kr | ≥ | 99.9995 | vol.% | Xe | ≤ | 1 | ppm | ≤ | 5 | ppm |
- | N2 | ≤ | 1 | ppm | - | - | - | |||||
- | Ar | ≤ | 1 | ppm | - | - | - | |||||
- | H2 | ≤ | 0.1 | ppm | - | - | - | |||||
- | O2 | ≤ | 0.3 | ppm | - | - | - | |||||
- | CF | ≤ | 0.1 | ppm | - | - | - | |||||
- | THC | ≤ | 0.1 | ppm | - | - | - | |||||
- | CO | ≤ | 0.1 | ppm | - | - | - | |||||
- | CO2 | ≤ | 0.1 | ppm | - | - | - | |||||
- | H2O | ≤ | 0.5 | ppm | - | - | - | |||||
Krypton | Kr 6.0 RG | Kr | ≥ | 99.9999 | vol.% | Xe | ≤ | 0.3 | ppm | - | - | - |
- | N2 | ≤ | 0.1 | ppm | - | - | - | |||||
- | Ar | ≤ | 0.1 | ppm | - | - | - | |||||
- | H2 | ≤ | 0.1 | ppm | - | - | - | |||||
- | O2 | ≤ | 0.1 | ppm | - | - | - | |||||
- | CF | ≤ | 0.1 | ppm | - | - | - | |||||
- | THC | ≤ | 0.1 | ppm | - | - | - | |||||
- | CO | ≤ | 0.1 | ppm | - | - | - | |||||
- | CO2 | ≤ | 0.1 | ppm | - | - | - | |||||
- | H2O | ≤ | 0.1 | ppm | - | - | - |