Method for measuring the concentration of nitrogen in argon by means of ion mobility spectrometry
US6740873B2 · kind B2 · utility
3Cited by
8References
18Claims
0Family size
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Key dates
| Filing date | May 16, 2003 |
| Grant date | May 25, 2004 |
| Priority date | — |
| Expiry date | May 16, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B2210/0046
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for carrying out nitrogen analysis by ionization mobility spectroscopy at concentrations of few parts per billion (ppb) in argon is described. The method involves the addition of hydrogen in concentration of at least 5 ppb and lower than 100 parts per million (ppm) to the argon to be analyzed; the hydrogen addition step may be preceded by a purification operation of the argon flow to reduce the total concentration of impurities other than nitrogen to under 1 ppb.
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