| 摘要 |
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, N2 and H2. An oxidizer is used to oxidize the CO and H2 into CO2 and H2O, respectively. The apparatus further includes a thermal conductivity detecting means for detecting CO2, N2 and H2O, coming from a first gas-chromatographic column which is used for separating H2O from the CO2 and N2. A second gas-chromatographic column is used for separating CO2 from N2. 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.
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