THEODORE, a two-step heating system for the EC/OC determination of radiocarbon (14C) in the environment

Szidat, Sönke; Jenk, Theo; Gäggeler, Heinz; Synal, H.-A.; Hajdas, I.; Bonani, G.; Saurer, M. (2004). THEODORE, a two-step heating system for the EC/OC determination of radiocarbon (14C) in the environment. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 223-224, pp. 829-836. Elsevier 10.1016/j.nimb.2004.04.153

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Measurements of 14C in the organic carbon (OC) and elemental carbon (EC) fractions, respectively, of fine aerosol particles bear the potential to apportion anthropogenic and biogenic emission sources. For this purpose, the system THEODORE (two-step heating system for the EC/OC determination of radiocarbon in the environment) was developed. In this device, OC and EC are transformed into carbon dioxide in a stream of oxygen at 340 and 650 �C, respectively, and reduced to filamentous carbon. This is the target material for subsequent accelerator mass spectrometry (AMS) 14C measurements, which were performed on sub-milligram carbon samples at the PSI/ETH compact 500 kV AMS system. Quality assurance measurements of SRM 1649a, Urban Dust, yielded a fraction of modern fM in total carbon (TC) of 0.522 ±0.018 (n ¼ 5, 95% confidence level) in agreement with reported values. The results for OC and EC are 0.70± 0.05 (n ¼ 3) and 0.066 ± 0.020 (n ¼ 4), respectively.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Szidat, Sönke; Jenk, Theo and Gäggeler, Heinz

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

0168-583X

Publisher:

Elsevier

Language:

English

Submitter:

Sönke Szidat

Date Deposited:

28 Jan 2016 10:44

Last Modified:

14 Mar 2016 12:52

Publisher DOI:

10.1016/j.nimb.2004.04.153

BORIS DOI:

10.7892/boris.74694

URI:

https://boris.unibe.ch/id/eprint/74694

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