| 摘要 |
PURPOSE:To enable measurement of a very small amount measuring object with good accuracy and responsiveness in detecting gas by a microwave absorption method by feeding continuously the compd. having the same or resembling structure as or to the structure of the measuring object in the gaseous flow to be measured at the fixed amount exceeding the adsorption equil. condition in the measuring system. CONSTITUTION:The same or resembling compd. as or to a measuring object is passed continuously together with a gaseous sample at a fixed concn. to a microwave gas sensor 30 in detecting org. molecular NH3, N2O, SO2, CH3SH, HCHO, etc. by a microwave absorption method. The measurement of, for example, NH3 in a blood is accomplished by passing a fixed concn. (for example, 2,000ppm) of NH3 as a carrier gas from an introducing device 21 and introducing NH3 in the blood together with said gas through a sample introducing port 20 to the sensor 30 so that the NH3 in the measuring system exceeds the adsorption equil. condition. The detection in short time with sensitivity higher by about 60 times than the case when NH3 is not supplied is made possible. The accurate detection with the trace sample which was previously not measurable is thus made possible. |
