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74 Chapter 5 Results and discussion causes pressure rises of up to 3 orders of magnitude in the vacuum (10-8 to 10-5 torr). Once the ion gauge filaments have been de-gassed, the total pressure returns to the normal background value of ~lxl0-8. This has been taken to indicate substantial adsorption in these two ion gauge filaments. A series of tests was run to see if an increase in the background CO2 concentration could be masked or swamped by: • using a high sample pressure, or • introducing a high CO2 concentration gas to allow adsorption to occur prior to introducing the sample, or • sampling with the ion gauge on to reduce the adsorption. 1e-9 ~ .-v'" 'E' 0 .e. ~ [ Ol + high pressure sample D. C02 swamped prior to sample <> ion gauge on 0 low pressure sample .~ Po. ~ .A ~",...".A",.A rr ~ =~ A 'v" a-n le-lO Figure 5.14 ~~~ D o 10 20 30 40 time (minutes) Comparison of change in measured CO2 peak height with time, from a room air sample, for four approaches to sampling. The results of these tests, compared to a low pressure sample, are shown in Figure 5.14. The low pressure sample and the CO2 swamped sample appear to show lower rates of change of CO2 concentration. The factors outlined above made a meaningful reading of the absolute CO2 concentration not possible. Since the re-appearance of the high CO2 peak seemed linked to the introduction of CO2 to the mass spectrometer a sequential samplitlg method was devised. In this method the difference in CO2 concentration between two samples is measured. This is done by measuring the background, then introducing the sample containing no or low CO2, and then the sample containing higher CO2, This method was tested by comparing CO2 scrubbed air with room air. The air was scrubbed by passingPDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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