THEODORE, a two-step heating system for the EC/OC determination of radiocarbon (14C) in the environment
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Description
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.
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.
Date of Publication
2004
Publication Type
Article
Subject(s)
Language(s)
en
Contributor(s)
Synal, H.-A. | |
Hajdas, I. | |
Bonani, G. | |
Saurer, M. |
Additional Credits
Series
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Publisher
Elsevier
ISSN
0168-583X
Access(Rights)
restricted