Selective detection with high speed gas chromatography

Ammunition and explosive-charge making – Bomb disposal

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

73 1G, 436156, F42B 1310, G01K 1900, G01N 2524

Patent

active

050997432

ABSTRACT:
A highly selective, sensitive, fast detection system and method are disclosed for detecting vapors of specific compounds in air. Vapors emanating from compounds such as explosives, or stripped from surfaces using heat and suction from a hand-held sample gun, are collected on surfaces coated with gas chromatograph (GC) material which trap explosives vapors but repel nitric oxide, then are desorbed and concentrated in one or more cold spot concentrators. A high speed gas chromatograph (GC) separates the vapors, after which specific vapors are decomposed in two pyrolyzers arranged in parallel and the resulting nitric oxide is detected. A low temperature pyrolyzer with silver produces NO from nitramines or nitrite esters; a high temperature pyrolyzer decomposes all explosives vapors to permit detection of the remaining explosives. Also disclosed is a series arrangement of pyrolyzers and gas chromatographs and an NO detector to time-shift detection of certain vapors and facilitate very fast GC analyses. The use of hydrogen as a carrier gas, plus unique collectors and concentrators, high speed heaters, NO detectors, and very fast, temperature-programmable GC's enhance selectivity, sensitivity and speed of detection.

REFERENCES:
patent: 3430482 (1969-03-01), Dravnieks et al.
patent: 3568411 (1971-03-01), Dravnieks et al.
patent: 3589171 (1971-06-01), Haley
patent: 3650696 (1972-03-01), Eads
patent: 3701632 (1972-10-01), Lovelock
patent: 3996009 (1976-12-01), Fine et al.
patent: 4018562 (1977-04-01), Parks et al.
patent: 4053281 (1977-10-01), Carter
patent: 4159894 (1979-07-01), Hu
patent: 4220452 (1980-09-01), Bray
patent: 4301114 (1981-11-01), Rounbehler et al.
patent: 4305724 (1981-12-01), Micko
patent: 4467038 (1984-08-01), Scott
patent: 4531398 (1985-07-01), Di Benedetto et al.
patent: 4534204 (1985-08-01), Bergquist
Lafleur et al., "Trace Level Determination of Selected Nitroaromatic Compounds by Gas Chromatography With Pyrolysis/Chemiluminescent Detection", Anal. Chem., vol. 53, 1981, pp. 1202-1205.
Conrad, "Explosives Detection-The Problem and Prospects", possible publication, of unknown date.
Goff et al., "Description of a Nitro/Nitroso Specific Detector For the Trace Analysis of Explosives", Int. Symposium on Analysis and Detection of Explosives, FBI Academy (1983).
Fine et al., "Applications of the Nitro/Nitroso Specific Detector to Explosive Residue Analysis", Int. Symposium on Analysis and Detection of Explosives, FBI Academy (1983).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Selective detection with high speed gas chromatography does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Selective detection with high speed gas chromatography, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Selective detection with high speed gas chromatography will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2251110

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.