Apparatus for analyzing oxygen, nitrogen and hydrogen contained

Details Apparatus for analyzing oxygen, nitrogen and hydrogen contained Apparatus for analyzing oxygen, nitrogen and hydrogen contained

1980-06-30

1981-12-15

Smith, William F.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Automatic analytical monitor and control of industrial process

422 69, 422 89, 73 19, 73 231, 23232C, G01N 2100, G01N 3106, G01N 3108, G01N 700

Patent

active

043059066

ABSTRACT:
An apparatus for analyzing oxygen, nitrogen and hydrogen which are contained in metals. The apparatus includes a graphite crucible which has a sample therein and which is heated to generate a gaseous mixture of CO, N.sub.2 and H.sub.2. An oxidizer is used to oxidize the CO and H.sub.2 into CO.sub.2 and H.sub.2 O, respectively. The apparatus further includes a thermal conductivity detecting means for detecting CO.sub.2, N.sub.2 and H.sub.2 O, coming from a first gas-chromatographic column which is used for separating H.sub.2 O from the CO.sub.2 and N.sub.2. A second gas-chromatographic column is used for separating CO.sub.2 from N.sub.2. A passage change valve is used for back-flushing the first column. Helium is preferably used as the carrier gas. The apparatus is simple and operates quickly because the three components, O, N and H, can be measured by using a single carrier gas He and a single sample and thus, only a single measurement operation is required.

REFERENCES:
patent: 3285701 (1966-11-01), Robertson
patent: 3949590 (1976-04-01), Boillot
patent: 4098576 (1978-07-01), Judge
Gas Chromatography Abstracts 1967, 135, p. 25.
Heftman; Erich, Chromatography, Van Nostrand Reinhold Co., 3rd Edition, 1975, pp. 883-887.

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