| 摘要 |
PURPOSE:To improve the efficiency of analysis by supplying oxygen from the point of the time when carbon dioxide begins to be generated as a result of the combustion of carbon in a sample and subjecting the concn. signal of the carbon dioxide generated during the combustion of the carbon in the sample to time series processing. CONSTITUTION:The org. material, amorphous carbon, graphite, etc. sticking to the surface of the sample 4 inserted into a combustion chamber 2 begin to burn by the effect of the heat from the outside and are fed in the form of carbon dioxide through a conduit 7 to an IR absorption cell 8 from which a measurement signal (voltage) is recorded time serially into an integration device 10. The end of the combustion of the carbon sticking to the surface, when detected by the comparator in the device 10, is time serially stored and held. The operation signal of a gas change-over device 11 is then emitted. The device 11 changes over the gaseous oxygen to a gaseous mixture composed of oxygen 5 and nitrogen 6, i.e., inert gaseous atmosphere. The simple quantitative determination of the trace carbon in the sample in a short period is thus made possible without the labor for cleaning up the surface. |
