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Comparing the new and old COK systems

Bruinenberg, Jelle (2023) Comparing the new and old COK systems. Bachelor's Thesis, Physics.


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At the Centre for Istope Research (CIO) in Groningen, a special system is in use to realise the carbonate-phosphoric acid reaction to produce CO2 for calibration purposes. This system (COK) needed an upgrade as its reproducibility is not satisfactory, especially not for oxygen-18. Come in the New COK system. But is it actually better? This report compares the old COK system with the new one, as well as 2 different methods of extraction of the CO2 from the sample vials. The old system has more valves and attachment points, leading to unnecessary risks of leakages. These valves and attachment points have been removed in the new system, as seen in figure 3.4. Method 3.1 and method 3.2. In the first method a CO2 trap is used, where is the later instead of a such trap, the CO2 is given time to natural migrate. For this to different sets where measure for giving it 20 minutes and 10 minutes. Both of these methods are further detailed in chapter 3. The lowest expected values of the mass spectrometer for the standard deviations are 0.017h and 0.03h for carbon-13 and oxygen-18 respectively. Given data of the old system has 0.07h and 0.11h as standard deviation of for carbon-13 and oxygen-18 respectively. The standard deviation over all set yields 0.05h and 0.11h again for carbon-13 and oxygen-18 respectively. From this it can be conclude that the new COK system is better. The trap method comes out significantly worse for Oxygen, than the the other methods. With a deviation of 0.14h. T

Item Type: Thesis (Bachelor's Thesis)
Supervisor name: Meijer, H.A.J.
Degree programme: Physics
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 16 May 2023 09:45
Last Modified: 16 May 2023 09:45

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