| 摘要 |
A quasi-continuous sorption/desorption analysis method includes the steps of admitting a sample to be analyzed to a stationary sorption/desorption bed for adsorption therein. The flow rate of the sample across the bed is maintained at a high rate for an extended period of time to produce a long sorption time cycle by the sorption bed. Conversely, the subsequent desorption of the sample from the sorption bed is achieved by selectively activating a rapid bed heating element and providing a concurrent low flow rate across the bed to desorb the sample from the sorption bed during a very short desorption time cycle to make the ratio of the sorption/desorption periods as large as possible. The desorbed sample is ultimately conducted to a sample constituent detector for analysis. A device utilizing the method of the present invention includes a sample inlet flow line having a selectively heatable sorption/desorption bed therein with the flow line being selectively switchable between a high flow rate operation and a low flow rate operation. The flow line is connected to a gas constituent detector system for analysis of a desorbed sample. During the low flow rate operation the sorption bed is selectively operated in a very fast heating cycle. A timing control is used to synchronize the heating operation of the sorption bed during the low flow rate operation of the flow line and the periodic switching of the flow line between the high flow rate and the low flow rate operations.
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