A Continuous-Flow Gas Interface of a Thermal/Optical Analyzer with 14C AMS for Source Apportionment of Atmospheric Aerosols

Agrios, Konstantinos; Salazar Quintero, Gary Abdiel; Szidat, Sönke (2017). A Continuous-Flow Gas Interface of a Thermal/Optical Analyzer with 14C AMS for Source Apportionment of Atmospheric Aerosols. Radiocarbon, 59(03), pp. 921-932. Arizona Board of Regents, University of Arizona 10.1017/RDC.2016.88

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This article reports on the performance of a continuous-flow interface for CO2 gas feeding into the ion source of a 200-kV accelerator mass spectrometer (AMS) in splitless mode. Distinct CO2 fractions and subfractions produced by a commercial Sunset OC/EC (organic carbon/elemental carbon) analyzer from ambient atmospheric aerosols filters are injected into the source and then analyzed by their 14C/12C ratio in real time. New features are revealed from organic aerosol subfractions, which thermally desorb close to each other and are only visible by real-time analysis. An optimized setup for this purpose is presented for the measurement of CO2 amounts from 3 to 45μg C. Efficiencies of 4.5–8.0% for the formation of C- ions from CO2 are obtained for sample masses of 5–10 μg C and carbon mass flow rates below 2 μg min–1. However, this ionization efficiency is substantially suppressed at high carbon mass flow rates. The potential of this method for a refined apportionment of aerosol sources is demonstrated with ambient filter samples.

Item Type:

Journal Article (Original Article)

Division/Institute:

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

UniBE Contributor:

Agrios, Konstantinos; 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:

08 Aug 2017 09:53

Last Modified:

08 Sep 2017 20:30

Publisher DOI:

10.1017/RDC.2016.88

BORIS DOI:

10.7892/boris.101381

URI:

https://boris.unibe.ch/id/eprint/101381

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