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Title: Ultratrace detector for hand-held gas chromatography

Abstract

An ultratrace detector system for hand-held gas chromatography having high sensitivity, for example, to emissions generated during production of weapons, biological compounds, drugs, etc. The detector system is insensitive to water, air, helium, argon, oxygen, and C0.sub.2. The detector system is basically composed of a hand-held capillary gas chromatography (GC), an insulated heated redox-chamber, a detection chamber, and a vapor trap. For example, the detector system may use gas phase redox reactions and spectral absorption of mercury vapor. The gas chromatograph initially separates compounds that percolate through a bed of heated mercuric oxide (HgO) in a silica--or other metal--aerogel material which acts as an insulator. Compounds easily oxidized by HgO liberate atomic mercury that subsequently pass through a detection chamber which includes a detector cell, such as quartz, that is illuminated with a 254 nm ultra-violet (UV) mercury discharge lamp which generates the exact mercury absorption bands that are used to detect the liberated mercury atoms. Atomic mercury strongly absorbs 254 nm energy is therefore a specific signal for reducing compounds eluting from the capillary GC, whereafter the atomic mercury is trapped for example, in a silicon-aerogel trap.

Inventors:
 [1];  [2]
  1. Livermore, CA
  2. Bethal Island, CA
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
872647
Patent Number(s):
US 5980832
Assignee:
Regents of University of California (Oakland, CA)
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
ultratrace; detector; hand-held; gas; chromatography; sensitivity; example; emissions; generated; production; weapons; biological; compounds; drugs; etc; insensitive; water; air; helium; argon; oxygen; c0; basically; composed; capillary; gc; insulated; heated; redox-chamber; detection; chamber; vapor; trap; phase; redox; reactions; spectral; absorption; mercury; chromatograph; initially; separates; percolate; bed; mercuric; oxide; hgo; silica-or; metal-aerogel; material; insulator; easily; oxidized; liberate; atomic; subsequently; pass; cell; quartz; illuminated; 254; nm; ultra-violet; discharge; lamp; generates; exact; bands; detect; liberated; atoms; strongly; absorbs; energy; specific; signal; reducing; eluting; whereafter; trapped; silicon-aerogel; absorption band; redox reaction; gas chromatography; discharge lamp; gas phase; gas chromatograph; mercury vapor; vapor trap; absorption bands; basically composed; detector cell; capillary gas; emissions generated; ultratrace detector; hand-held gas; capillary gc; aerogel material; biological compounds; /422/

Citation Formats

Andresen, Brian D, and Miller, Fred S. Ultratrace detector for hand-held gas chromatography. United States: N. p., 1999. Web.
Andresen, Brian D, & Miller, Fred S. Ultratrace detector for hand-held gas chromatography. United States.
Andresen, Brian D, and Miller, Fred S. Fri . "Ultratrace detector for hand-held gas chromatography". United States. https://www.osti.gov/servlets/purl/872647.
@article{osti_872647,
title = {Ultratrace detector for hand-held gas chromatography},
author = {Andresen, Brian D and Miller, Fred S},
abstractNote = {An ultratrace detector system for hand-held gas chromatography having high sensitivity, for example, to emissions generated during production of weapons, biological compounds, drugs, etc. The detector system is insensitive to water, air, helium, argon, oxygen, and C0.sub.2. The detector system is basically composed of a hand-held capillary gas chromatography (GC), an insulated heated redox-chamber, a detection chamber, and a vapor trap. For example, the detector system may use gas phase redox reactions and spectral absorption of mercury vapor. The gas chromatograph initially separates compounds that percolate through a bed of heated mercuric oxide (HgO) in a silica--or other metal--aerogel material which acts as an insulator. Compounds easily oxidized by HgO liberate atomic mercury that subsequently pass through a detection chamber which includes a detector cell, such as quartz, that is illuminated with a 254 nm ultra-violet (UV) mercury discharge lamp which generates the exact mercury absorption bands that are used to detect the liberated mercury atoms. Atomic mercury strongly absorbs 254 nm energy is therefore a specific signal for reducing compounds eluting from the capillary GC, whereafter the atomic mercury is trapped for example, in a silicon-aerogel trap.},
doi = {},
url = {https://www.osti.gov/biblio/872647}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

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Works referenced in this record:

Enzymatic Synthesis of Isoprene from Dimethylallyl Diphosphate in Aspen Leaf Extracts
journal, December 1991


Sub-parts per billion detection of isoprene using a reduction gas detector with a portable gas chromatograph
journal, November 1993


Airborne, Continuous Measurement of Carbon Monoxide in the Lower Troposphere
journal, January 1996


Determination of reactive hydrocarbons by capillary gas chromatography with the reduction gas detector
journal, September 1994


Silica aerogel films prepared at ambient pressure by using surface derivatization to induce reversible drying shrinkage
journal, March 1995