| 摘要 |
PURPOSE:To measure amount of constituent in a specimen at high accuracy using a simple apparatus, by a method wherein generated gas in whole amount or in part at uniform concentration is forced into a measuring cell of a gas analyzer and the gas concentration is measured. CONSTITUTION:When oxygen gas is supplied from an oxygen bomb 2 into a combustion chamber 1 and a pot 3 containing a specimen 4 is inserted and a furnace is operated, carbon and sulfer in the specimen 4 become CO2 gas and SO2 gas respectively. These generated gases are forced by a pump 11 through a check valve 12 into a measuring cell 13 and a dummy cell 14 of a gas analyzer 6 such as infrared analyzer for measuring the gas concentration. Then an electromagnetic valve 15 is closed, and a closed combustion measuring system is constituted by the combustion chamber 1, the pump 11, the measuring cell 13, the dummy cell 14 etc. Most of generated gas is fed to the measuring cell 13 and the dummy cell 14. Since amount of gas measured at the measuring cell 13, e.g. CO2 gas is proportional to that of carbon in the specimen 4, if calibration curve of carbon amount and CO2 concentration is previously determined by measuring the standard specimen, carbon amount in the specimen can be known from the measured gas concentration. |
