Selective, high speed detection of vapors with analysis of multi

Details Selective, high speed detection of vapors with analysis of multi Selective, high speed detection of vapors with analysis of multi

1993-03-22

1993-12-07

Housel, James C.

Chemistry: analytical and immunological testing

Heterocyclic carbon compound

Hetero-n

73 232, 73 2341, 73 2342, 422 88, 422 89, 422 91, 436 98, 436107, 436111, 436157, 436158, 436161, 436178, 436816, 436901, G01N 3008, G01N 118, G01N 3088, G01N 3394

Patent

active

052683028

ABSTRACT:
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.

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