Ammonia monitor based on ion mobility spectrometry with selectiv

Details Ammonia monitor based on ion mobility spectrometry with selectiv Ammonia monitor based on ion mobility spectrometry with selectiv

1991-08-16

1993-08-10

Housel, James C.

Chemistry: analytical and immunological testing

Nuclear magnetic resonance, electron spin resonance or other...

436113, 436171, 422 8201, 422 8202, 422 90, 422 98, 250282, 250286, 250287, 250288, G01N 2400

Patent

active

052348385

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.

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