Acid gas monitor based on ion mobility spectrometry

Details Acid gas monitor based on ion mobility spectrometry Acid gas monitor based on ion mobility spectrometry

1990-06-01

1991-07-16

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Methods

250287, 250288, H01J 4940

Patent

active

050327216

ABSTRACT:
An improved method for operating an ion mobility spectrometer (IMS) to enable detection of an acid gas analyte when air is used as the carrier gas and the drift gas in the IMS. A controlled concentration of a dopant substance is added to the air carrier gas stream prior to application of the carrier gas stream. In the IMS, the drift times of the ions generated from the doped air carrier gas differ from the drift times of the ions generated from the acid gas analyte, enabling the identification and quantification of the analyte. The dopants comprise substituted phenol compounds, with methyl salicylate (MS) or 2-hydroxyacetophenone (2-HAP) being preferred.

REFERENCES:
patent: 3717028 (1973-02-01), Annino et al.
patent: 4777363 (1988-10-01), Eiceman et al.
patent: 4797554 (1989-01-01), Blanchard et al.
patent: 4950893 (1990-08-01), Reategui et al.
Bacon et al., "Detection of HF Using Atomspheric Pressure Ionization (API) and Ion Mobility Spectrometry (IMS)", Jun. 3, 1990.

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