Ammonia monitor based on ion mobility spectrometry with selective dopant chemistry
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United States of America Patent
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Aug 10, 1993
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app pub date -
Aug 16, 1991
filing date -
Apr 17, 1990
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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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