| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent deterioration in measurement accuracy by calculating a dilution ratio or the sensitivity of a detector so that the peak is not over an input range when it is judged that a component of which the peak is over the input range exists, executing the remeasurement to only the component over the input range, and using the initial measurement peak on the component not over the input range. SOLUTION: A 8-port valve 14 is switched and a microsyringe 16 is driven on the basis of a control signal from a control portion 58. The syringe 16 is connected to a branch portion 3, and a constant amount of sample is extracted by a syringe 16. In a case where a specific dilution ratio is set, the syringe 16 is connected to the dilution water 24 to add a predetermined amount of dilution water to the sample in the syringe 16. Then the sample of the syringe 16 is injected to a TC combustion tube 36 through a TC sample inlet 34 of a TC oxidation reaction part 32, whereby a carbon component in the sample is converted into CO2 , and a nitrogen component is converted into NO. CO2 is detected by an infrared ray gas analyzing portion 46, and NO is detected by a chemiluminescence analyzing portion 48 to be sent to an operating part 56, and the TC concentration and TN concentration can be determined on the basis of the signals therefrom.</p> |
