Radiant energy – Methods including separation or nonradiant treatment of test...
Patent
1979-07-31
1981-04-28
Anderson, Bruce C.
Radiant energy
Methods including separation or nonradiant treatment of test...
G01N 3100, G01N 3300
Patent
active
042648149
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 (.about.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.
REFERENCES:
patent: 2917629 (1959-12-01), Andrychuk
patent: 3530292 (1970-09-01), Hill
Beattie Willard H.
Freund Samuel M.
Holland Redus F.
Maier, II William B.
Anderson Bruce C.
Besha Richard G.
Denny James E.
Gaetjens Paul D.
The United States of America as represented by the United States
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