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Title: Method and apparatus for detecting halogenated hydrocarbons

Abstract

A halogenated hydrocarbon (HHC) detector is formed from a silent discharge (also called a dielectric barrier discharge) plasma generator. A silent discharge plasma device receives a gas sample that may contain one or more HHCs and produces free radicals and excited electrons for oxidizing the HHCs in the gas sample to produce water, carbon dioxide, and an acid including halogens in the HHCs. A detector is used to sensitively detect the presence of the acid. A conductivity cell detector combines the oxidation products with a solvent where dissociation of the acid increases the conductivity of the solvent. The conductivity cell output signal is then functionally related to the presence of HHCs in the gas sample. Other detectors include electrochemical cells, infrared spectrometers, and negative ion mobility spectrometers.

Inventors:
 [1];  [1]
  1. (Los Alamos, NM)
Issue Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM
OSTI Identifier:
871139
Patent Number(s):
5665604
Assignee:
Regents of University of California, Office of Technology (Alameda, CA) LANL
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; detecting; halogenated; hydrocarbons; hydrocarbon; hhc; detector; formed; silent; discharge; called; dielectric; barrier; plasma; generator; device; receives; gas; sample; contain; hhcs; produces; free; radicals; excited; electrons; oxidizing; produce; water; carbon; dioxide; acid; including; halogens; sensitively; detect; presence; conductivity; cell; combines; oxidation; products; solvent; dissociation; increases; output; signal; functionally; related; detectors; electrochemical; cells; infrared; spectrometers; negative; mobility; oxidation products; free radical; dielectric barrier; mobility spectrometer; plasma generator; gas sample; halogenated hydrocarbons; functionally related; electrochemical cells; carbon dioxide; electrochemical cell; output signal; discharge plasma; free radicals; halogenated hydrocarbon; plasma device; barrier discharge; oxidation product; silent discharge; cell output; infrared spectrometer; /436/422/

Citation Formats

Monagle, Matthew, and Coogan, John J. Method and apparatus for detecting halogenated hydrocarbons. United States: N. p., 1997. Web.
Monagle, Matthew, & Coogan, John J. Method and apparatus for detecting halogenated hydrocarbons. United States.
Monagle, Matthew, and Coogan, John J. Wed . "Method and apparatus for detecting halogenated hydrocarbons". United States. https://www.osti.gov/servlets/purl/871139.
@article{osti_871139,
title = {Method and apparatus for detecting halogenated hydrocarbons},
author = {Monagle, Matthew and Coogan, John J.},
abstractNote = {A halogenated hydrocarbon (HHC) detector is formed from a silent discharge (also called a dielectric barrier discharge) plasma generator. A silent discharge plasma device receives a gas sample that may contain one or more HHCs and produces free radicals and excited electrons for oxidizing the HHCs in the gas sample to produce water, carbon dioxide, and an acid including halogens in the HHCs. A detector is used to sensitively detect the presence of the acid. A conductivity cell detector combines the oxidation products with a solvent where dissociation of the acid increases the conductivity of the solvent. The conductivity cell output signal is then functionally related to the presence of HHCs in the gas sample. Other detectors include electrochemical cells, infrared spectrometers, and negative ion mobility spectrometers.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {1}
}

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