Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing gas sample
Patent
1997-09-23
1999-11-09
Soderquist, Arlen
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing gas sample
422 83, 422 88, 422 89, G01N 2100, G01N 3100
Patent
active
059808322
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.
REFERENCES:
patent: 3420636 (1969-01-01), Robbins
patent: 4309385 (1982-01-01), Harada et al.
patent: 4411867 (1983-10-01), Ostrander
patent: 4889814 (1989-12-01), Succi
patent: 5209773 (1993-05-01), Audhe et al.
patent: 5325016 (1994-06-01), Srivastava
patent: 5382452 (1995-01-01), Bruno et al.
patent: 5409683 (1995-04-01), Tillotson et al.
patent: 5525799 (1996-06-01), Andresen et al.
patent: 5607496 (1997-03-01), Brooks
patent: 5746992 (1998-05-01), Yoldas et al.
Silver, G. M. and Fall, R. "Enzymatic Synthesis of Isoprene from Dimethylallyl Diphosphate in Aspen Leaf Extracts." Plant Physiol. 1588-1591, 1991.
Prakash, S. S., Brinker, C. J., Hurd, A. J., and Rao, S. M. "Silica Aerogel Films Prepared at Ambient Pressure by Using Surface Derivatization to Induce Reversible Drying Shrinkage." Nature, 439-443, Mar. 1995.
Cao, X., Hewitt, C. N., Waterhouse, K. S. "Determination of Reactive Hydrocarbons by Capillary Gas Chromatography with the Reduction Gas Detector." J. Chromatog. A., 115-121, Sep. 1994.
Klemm, O., Hanh, M., and Giehl, H. "Airborne, Continuous Measurement of Carbon Monoxide in the Lower Troposphere." Environ. Sci. Technol. 115-120, 1996.
Greenberg, J.P., et al. "Sub-Parts Per Billion Detection of Isoprene Using a Reduction Gas Detector with a Portable Gas Chromatograph." Atmos. Environ. 27A: 2689-2692, Nov. 1993.
Andresen Brian D.
Miller Fred S.
Cannell Kevin P.
Carnahan L. E.
Soderquist Arlen
The Regents of the University of California
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