Data Analysis Techniques for Ion Mobility Spectrometry.
NIOSH 1991 Feb:113-135
Recent advances in ion mobility spectrometry (IMS) were reviewed. IMS was based upon the flow or drift of molecular ions through a gas of uniform temperature and pressure. A weak electric field is uniformly applied to the gas in the drift region of the IMS, causing the ions to move along the field lines. The ions drift until their movement is impeded by collisions with neutral gas molecules. The usefulness of IMS as an analytical tool for the rapid detection of airborne vapors in the atmosphere has been researched and computer techniques for preprocessing IMS signals have also advanced. Advancements in the linear discriminant analysis have been put forth including IMSDISC and TRAIN, two computer programs which assist in the analysis. A third program, IMSIDENT, uses the linear discriminate values created with TRAIN. In actual use, a number of false positive alarms were generated indicating the presence of diethyl-ether. If the discriminant function is trained to ignore the acetone reactant ion peak, a false alarm is not triggered.
Organic-solvents; Analytical-methods; Analytical-processes; Chemical-analysis; Analytical-chemistry; Environmental-pollution; Mathematical-models;
Field Screening Methods for Hazardous Wastes and Toxic Chemicals. Second International Symposium, February 12-14, 1991. Sponsored by U.S. EPA; U.S. DOE; U.S. Army Toxic and Hazardous Materials Agency; U.S. Army Chemical Research Development and Engineering Center; U.S.A.F.; Florida State Univ.; National Environmental Technology Applications Corp.; and NIOSH