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Title: Method for detecting trace impurities in gases

Abstract

A technique for considerably improving the sensitivity and specificity of infrared spectrometry as applied to quantitative determination of trace impurities in various carrier or solvent gases is presented. A gas to be examined for impurities is liquefied and infrared absorption spectra of the liquid are obtained. Spectral simplification and number densities of impurities in the optical path are substantially higher than are obtainable in similar gas-phase analyses. Carbon dioxide impurity (approx. 2 ppM) present in commercial Xe and ppM levels of Freon 12 and vinyl chloride added to liquefied air are used to illustrate the method.

Inventors:
; ; ;
OSTI Identifier:
5406598
Assignee:
TIC; ERA-05-029376; EDB-80-084706
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTROSCOPY; GASES; IMPURITIES; CARBON DIOXIDE; CHEMICAL ANALYSIS; CHLORINATED ALIPHATIC HYDROCARBONS; FREONS; INFRARED SPECTRA; SENSITIVITY; VINYL MONOMERS; XENON; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; ELEMENTS; FLUIDS; HALOGENATED ALIPHATIC HYDROCARBONS; MONOMERS; NONMETALS; ORGANIC CHLORINE COMPOUNDS; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; RARE GASES; REFRIGERANTS; SPECTRA; SPECTROSCOPY; WORKING FLUIDS; 400104* - Spectral Procedures- (-1987)

Citation Formats

Freund, S M, Maier, II, W B, Holland, R F, and Beattie, W H. Method for detecting trace impurities in gases. United States: N. p., Web.
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Freund, S M, Maier, II, W B, Holland, R F, & Beattie, W H. Method for detecting trace impurities in gases. United States.
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Freund, S M, Maier, II, W B, Holland, R F, and Beattie, W H. . "Method for detecting trace impurities in gases". United States.
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@article{osti_5406598,
title = {Method for detecting trace impurities in gases},
author = {Freund, S M and Maier, II, W B and Holland, R F and Beattie, W H},
abstractNote = {A technique for considerably improving the sensitivity and specificity of infrared spectrometry as applied to quantitative determination of trace impurities in various carrier or solvent gases is presented. A gas to be examined for impurities is liquefied and infrared absorption spectra of the liquid are obtained. Spectral simplification and number densities of impurities in the optical path are substantially higher than are obtainable in similar gas-phase analyses. Carbon dioxide impurity (approx. 2 ppM) present in commercial Xe and ppM levels of Freon 12 and vinyl chloride added to liquefied air are used to illustrate the method.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {},
month = {}
}
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