| Summary: | 碩士 === 國立中央大學 === 化學研究所 === 87 === Methane is one of the important greenhouse gases with average mixing ratio of about 1.78ppm (v/v) in the clean atmosphere, and is increasing with a growth rate of about 1%.
The rates of emission growth or reduction of methane can only be obtained by long-term time-series measurements. An analytical apparatus, which can perform unattended, continuous, and highly stable measurements, is essential to the success of a monitoring program.
In this experiment a computer controller GC system was built to perform automated measurements from open atmosphere or sample canisters. Operations of sample loading, purging, injection, separation, detection, and data acquisition, etc., are based on a series of time events prescribed in the software. The maximum temporal resolution (the shortest cycle time) for the continuous measurement is about 10 minutes. As a result, more than one hundred measurements can be made within a day. Results from a three-day measurement period with 30-minute cycle-time will be discussed to demonstrate its applicability in a fixed site monitoring program.
When loading a different method file on the software, the system was switched to a canister model and automated analyses of canisters were performed for samples collected in Taipei metropolis.
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