DETECTION AND IDENTIFICATION OF CHEMICAL SIGNATURES
Final rept. 8 Jan 1966-7 Apr 1969
IIT RESEARCH INST CHICAGO IL
Pagination or Media Count:
In the work on the detection and identification of human chemical signatures, experimental and computerized statistical techniques were first developed, tested, and standardized. The experimental techniques solved the problems of sample collection, recovery, injection into the gas chromatograph, calibration and characterization of signature components. The sample collections were based on the principle of equilibration and were performed by means of Apiezon L-coated Teflon powder in the form of a fluidized bed. The collected samples were transferred into a special injector needle by means of an IITRI-designed transfer system. The injection of samples into the gas chromatograph was performed in a timed, automatic and reproducible manner with a specially constructed injection system. The calibration method permitted correlation of the concentrations of known signature components in air with their respective peak areas. The sensitivity of this novel process is of the order of one part per billion by volume of an organic component in air.
- Atomic and Molecular Physics and Spectroscopy