G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 30/14 (2006.01) B01D 15/08 (2006.01) G01N 30/12 (2006.01) G01N 30/84 (2006.01) G01N 31/12 (2006.01) G01N 1/22 (2006.01) G01N 21/76 (2006.01) G01N 30/16 (2006.01) G01N 30/30 (2006.01) G01N 30/46 (2006.01)
Patent
CA 2043328
Abstract of the Disclosure Disclosed are a method and apparatus for selective, high speed detection of vapors of specific gas-chromatographically- separable compounds. In the disclosed method separate analyses are performed on two portions of a gas sample formed by flash-heating trapped vapors to successively higher temperatures while flowing hydrogen carrier gas over coatings in/on which the vapors are held. Within a total time interval of about twenty seconds 1) two sample portions are formed, 2) each portion is rapidly separated in two series-connected, high speed, temperature-programmed gas chromatographs, and 3) specific compounds are identified by detection of NO gas formed during an oxidative pyrolysis of each separated portion. One application of the described method and apparatus is the rapid, selective, and sensitive detection of nitrogen-containing compounds such as the drugs methamphetamine, cocaine, and heroin. 3569c
Lieb David P.
Rounbehler David P.
Smart & Biggar
Thermedics Inc.
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