Resolution and Performance of Ion Mobility Spectrometry Towards Application in Combustion and Incineration Processes. Technical Progress Report, 15 September 1983-1 August 1984

摘要

Ion mobility spectrometry is an atmospheric pressure based technique for separation and detection of organic compounds as ions in gaseous phase. Restrictions by which IMS has not been developed as an analytical tool and applied in combustion and other processes include durability and resolution. At NMSU during 1983 to 1984 a rugged, easily operated, conveniently modified and rapidly repaired IMS under microcomputer control has been build with a final goal of improved operation and resolution with evaluation as a stack monitor for organic compounds of environmental significance. In work completed to date, an IMS has been designed and build from stock materials and has been successfully operated as a device for detection of toxic organic compounds generated in vapor phase in the laboratory. Use of an inexpensive computer for acquisition of signal and control of certain instrumental parameters has been completed or in some parts is near completion. Baseline data have been collected on a commercial IMS for reactant ions per Karasek's observation of a parabolic relationship between R and E. A similar pattern was also seen in our independent studies and was a major goal for the first year of this project. Results were additional experimental support for improved resolution using voltage-programmed IMS. Twenty major studies involving major but convenient modifications of the IMS were completed toward better understanding of contribution to band broadening in the NMSU tube. We have developed and will continue to refine a model of IMS performance with measured contribution from various instrumental parameters including construction. In work not scheduled until next year but already tested this year, emissions in smoke from various combustion process have been scanned using IMS. 18 figures. (ERA citation 09:044479)