A low-cost continuous-flow gas interface for coupling an elemental analyzer with a Micadas AMS: gas flow mathematical model and first results

Salazar, Gary; Szidat, Sönke (2019). A low-cost continuous-flow gas interface for coupling an elemental analyzer with a Micadas AMS: gas flow mathematical model and first results. Radiocarbon, pp. 1-10. Arizona Board of Regents, University of Arizona 10.1017/RDC.2019.93

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A fully automatic continuous-flow gas injection interface was built to couple an elemental analyzer with a MICADAS accelerator mass spectrometer (AMS) as a low-cost option that does not require an absorber trap for CO2 injection. The complication of the variable ion current during gas injection can be overcome by understanding and controlling the mass flow-dependent ionization yield. The time-varying CO2 concentrations and carbon mass flows are estimated with a mathematical model in order to investigate their relationship with the abundant isotope (12C–) signal. This model is based on a complete CO2 diffusion equation and instantaneous mass flow. It shows a good agreement between model calculations and the measurements. A reversible suppression of the formation of ions occurs, if the carbon mass flow exceeds 2.0–2.3 μg C/min. This result repeats for different injection capillaries and for different carrier volumetric flow rates.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Salazar Quintero, Gary Abdiel and Szidat, Sönke

Subjects:

500 Science > 540 Chemistry

ISSN:

0033-8222

Publisher:

Arizona Board of Regents, University of Arizona

Language:

English

Submitter:

Sönke Szidat

Date Deposited:

02 Sep 2019 09:02

Last Modified:

25 Oct 2019 07:33

Publisher DOI:

10.1017/RDC.2019.93

BORIS DOI:

10.7892/boris.132744

URI:

https://boris.unibe.ch/id/eprint/132744

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