Ammonia monitor based on ion mobility spectrometry with selective dopant chemistry
US5234838A · kind A · utility
34Cited by
10References
30Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 16, 1991 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | Aug 16, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved ion mobility spectrometer (IMS) and method for operating the same which enables analysis of ammonia in a mixture of gases when air is used as the carrier gas and the drift gas in the IMS. A controlled concentration of an ester such as Dimethyl methyl phosphonate (DMMP) is added to the air carrier gas stream prior to application of the carrier gas stream. The DMMP clusters with the ammonia, and the drift times of the ionized clusters differ from the drift times of the ions generated from the other constituents of the sample, thereby enabling identification and quantification of the ammonia.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.