(Received 2 May 1996; accepted 5 July 1996)
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Current methods for the detection of tear gas residues require extensive sample preparation before spectral measurement. This contrasts with the present work in which a new detection method for the active ingredients of CN (α-chloroacetophenone), CS (2-chlorobenzylidenemalononitrile), and pepper sprays (capsaicin and crude pepper extracts) based on ambient temperature, atmospheric pressure ion mobility spectrometry has been developed. The minimum determinable limits were: α-chloroacetophenone 0.1 μg, 2-chlorobenzylidenemalononitrile 25 mg, and cayenne pepper 5 mg. These limits were dependent on the vapor pressure, proton affinity and electronegativity of the target molecule.
Professor, University of Sheffield,
Lecturer, School of Aquatic Science and Natural Resources Management, Deakin University, Victoria,
Stock #: JFS14118J