Microgram level radiocarbon (14C) determination on carbonaceous particles in ice
In climate research the interest on carbonaceous particles has increased over the last years because of their influence on the radiation balance of the earth. Nevertheless, there is a paucity of available data regarding their concentrations and sources in the past. Such data would be important for a...
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ftunivbern:oai:boris.unibe.ch:22423 2023-08-20T04:07:12+02:00 Microgram level radiocarbon (14C) determination on carbonaceous particles in ice Jenk, Theo Szidat, Sönke Schwikowski, Margit Gäggeler, Heinz Wacker, L Synal, H Saurer, M 2007 application/pdf https://boris.unibe.ch/22423/1/1-s2.0-S0168583X07002935-main.pdf https://boris.unibe.ch/22423/ eng eng Elsevier https://boris.unibe.ch/22423/ info:eu-repo/semantics/restrictedAccess Jenk, Theo; Szidat, Sönke; Schwikowski, Margit; Gäggeler, Heinz; Wacker, L; Synal, H; Saurer, M (2007). Microgram level radiocarbon (14C) determination on carbonaceous particles in ice. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 259(1), pp. 518-525. Amsterdam: Elsevier 10.1016/j.nimb.2007.01.196 <http://dx.doi.org/10.1016/j.nimb.2007.01.196> 570 Life sciences biology 540 Chemistry info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2007 ftunivbern https://doi.org/10.1016/j.nimb.2007.01.196 2023-07-31T20:46:15Z In climate research the interest on carbonaceous particles has increased over the last years because of their influence on the radiation balance of the earth. Nevertheless, there is a paucity of available data regarding their concentrations and sources in the past. Such data would be important for a better understanding of their effects and for estimating their influence on future climate. Here, a technique is described to extract carbonaceous particles from ice core samples with subsequent separation of the two main constituents into organic carbon (OC) and elemental carbon (EC) for analysis of their concentrations in the past. This is combined with further analysis of OC and EC 14C/12C ratios by accelerator mass spectrometry (AMS), what can be used for source apportionment studies of past emissions. We further present how 14C analysis of the OC fraction could be used in the future to date any ice core extracted from a high-elevation glacier. Described sample preparation steps to final analysis include the combustion of micrograms of water–insoluble carbonaceous particles, primary collected by filtration of melted ice samples, the graphitisation of the obtained CO2 to solid AMS target material and final AMS measurements. Possible fractionation processes were investigated for quality assurance. Procedural blanks were reproducible and resulted in carbon masses of 1.3 ± 0.6 μg OC and 0.3 ± 0.1 μg EC per filter. The determined fraction of modern carbon (fM) for the OC blank was 0.61 ± 0.13. The analysis of processed IAEA-C6 and IAEA-C7 reference material resulted in fM = 1.521 ± 0.011 and δ13C = −10.85 ± 0.19‰, and fM = 0.505 ± 0.011 and δ13C = −14.21 ± 0.19‰, respectively, in agreement with consensus values. Initial carbon contents were thereby recovered with an average yield of 93%. Article in Journal/Newspaper ice core BORIS (Bern Open Repository and Information System, University of Bern) Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 259 1 518 525 |
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BORIS (Bern Open Repository and Information System, University of Bern) |
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ftunivbern |
language |
English |
topic |
570 Life sciences biology 540 Chemistry |
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570 Life sciences biology 540 Chemistry Jenk, Theo Szidat, Sönke Schwikowski, Margit Gäggeler, Heinz Wacker, L Synal, H Saurer, M Microgram level radiocarbon (14C) determination on carbonaceous particles in ice |
topic_facet |
570 Life sciences biology 540 Chemistry |
description |
In climate research the interest on carbonaceous particles has increased over the last years because of their influence on the radiation balance of the earth. Nevertheless, there is a paucity of available data regarding their concentrations and sources in the past. Such data would be important for a better understanding of their effects and for estimating their influence on future climate. Here, a technique is described to extract carbonaceous particles from ice core samples with subsequent separation of the two main constituents into organic carbon (OC) and elemental carbon (EC) for analysis of their concentrations in the past. This is combined with further analysis of OC and EC 14C/12C ratios by accelerator mass spectrometry (AMS), what can be used for source apportionment studies of past emissions. We further present how 14C analysis of the OC fraction could be used in the future to date any ice core extracted from a high-elevation glacier. Described sample preparation steps to final analysis include the combustion of micrograms of water–insoluble carbonaceous particles, primary collected by filtration of melted ice samples, the graphitisation of the obtained CO2 to solid AMS target material and final AMS measurements. Possible fractionation processes were investigated for quality assurance. Procedural blanks were reproducible and resulted in carbon masses of 1.3 ± 0.6 μg OC and 0.3 ± 0.1 μg EC per filter. The determined fraction of modern carbon (fM) for the OC blank was 0.61 ± 0.13. The analysis of processed IAEA-C6 and IAEA-C7 reference material resulted in fM = 1.521 ± 0.011 and δ13C = −10.85 ± 0.19‰, and fM = 0.505 ± 0.011 and δ13C = −14.21 ± 0.19‰, respectively, in agreement with consensus values. Initial carbon contents were thereby recovered with an average yield of 93%. |
format |
Article in Journal/Newspaper |
author |
Jenk, Theo Szidat, Sönke Schwikowski, Margit Gäggeler, Heinz Wacker, L Synal, H Saurer, M |
author_facet |
Jenk, Theo Szidat, Sönke Schwikowski, Margit Gäggeler, Heinz Wacker, L Synal, H Saurer, M |
author_sort |
Jenk, Theo |
title |
Microgram level radiocarbon (14C) determination on carbonaceous particles in ice |
title_short |
Microgram level radiocarbon (14C) determination on carbonaceous particles in ice |
title_full |
Microgram level radiocarbon (14C) determination on carbonaceous particles in ice |
title_fullStr |
Microgram level radiocarbon (14C) determination on carbonaceous particles in ice |
title_full_unstemmed |
Microgram level radiocarbon (14C) determination on carbonaceous particles in ice |
title_sort |
microgram level radiocarbon (14c) determination on carbonaceous particles in ice |
publisher |
Elsevier |
publishDate |
2007 |
url |
https://boris.unibe.ch/22423/1/1-s2.0-S0168583X07002935-main.pdf https://boris.unibe.ch/22423/ |
genre |
ice core |
genre_facet |
ice core |
op_source |
Jenk, Theo; Szidat, Sönke; Schwikowski, Margit; Gäggeler, Heinz; Wacker, L; Synal, H; Saurer, M (2007). Microgram level radiocarbon (14C) determination on carbonaceous particles in ice. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 259(1), pp. 518-525. Amsterdam: Elsevier 10.1016/j.nimb.2007.01.196 <http://dx.doi.org/10.1016/j.nimb.2007.01.196> |
op_relation |
https://boris.unibe.ch/22423/ |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.nimb.2007.01.196 |
container_title |
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms |
container_volume |
259 |
container_issue |
1 |
container_start_page |
518 |
op_container_end_page |
525 |
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1774718666324049920 |