Sun, Shuwen, Meyer, Vera D., Dolman, Andrew M., Winterfeld, Maria, Hefter, Jens ORCID: 0000-0002-5823-1966, Dummann, Wolf ORCID: 0000-0001-6054-2440, McIntyre, Cameron, Montlucon, Daniel B., Haghipour, Negar, Wacker, Lukas, Gentz, Torben, van der Voort, Tessa S., Eglinton, Timothy, I and Mollenhauer, Gesine ORCID: 0000-0001-5138-564X (2020). C-14 BLANK ASSESSMENT IN SMALL-SCALE COMPOUND-SPECIFIC RADIOCARBON ANALYSIS OF LIPID BIOMARKERS AND LIGNIN PHENOLS. Radiocarbon, 62 (1). S. 207 - 219. TUCSON: UNIV ARIZONA DEPT GEOSCIENCES. ISSN 1945-5755

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Abstract

Compound-specific radiocarbon (C-14) dating often requires working with small samples of < 100 mu g carbon (mu gC). This makes the radiocarbon dates of biomarker compounds very sensitive to biases caused by extraneous carbon of unknown composition, a procedural blank, which is introduced to the samples during the steps necessary to prepare a sample for radiocarbon analysis by accelerator mass spectrometry (i.e., isolating single compounds from a heterogeneous mixture, combustion, gas purification and graphitization). Reporting accurate radiocarbon dates thus requires a correction for the procedural blank. We present our approach to assess the fraction modern carbon ((FC)-C-14) and the mass of the procedural blanks introduced during the preparation procedures of lipid biomarkers (i.e. n-alkanoic acids) and lignin phenols. We isolated differently sized aliquots (6-151 mu gC) of n-alkanoic acids and lignin phenols obtained from standard materials with known (FC)-C-14 values. Each compound class was extracted from two standard materials (one fossil, one modern) and purified using the same procedures as for natural samples of unknown (FC)-C-14. There is an inverse linear relationship between the measured (FC)-C-14 values of the processed aliquots and their mass, which suggests constant contamination during processing of individual samples. We use Bayesian methods to fit linear regression lines between (FC)-C-14 and 1/mass for the fossil and modern standards. The intersection points of these lines are used to infer (FCblank)-C-14 and m(blank) and their associated uncertainties. We estimate 4.88 +/- 0.69 mu gC of procedural blank with (FC)-C-14 of 0.714 +/- 0.077 for n-alkanoic acids, and 0.90 +/- 0.23 mu gC of procedural blank with (FC)-C-14 of 0.813 +/- 0.155 for lignin phenols. These (FCblank)-C-14 and m(blank)( )can be used to correct AMS results of lipid and lignin samples by isotopic mass balance. This method may serve as a standardized procedure for blank assessment in small-scale radiocarbon analysis.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Sun, ShuwenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meyer, Vera D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dolman, Andrew M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Winterfeld, MariaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hefter, JensUNSPECIFIEDorcid.org/0000-0002-5823-1966UNSPECIFIED
Dummann, WolfUNSPECIFIEDorcid.org/0000-0001-6054-2440UNSPECIFIED
McIntyre, CameronUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Montlucon, Daniel B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haghipour, NegarUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wacker, LukasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gentz, TorbenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van der Voort, Tessa S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eglinton, Timothy, IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mollenhauer, GesineUNSPECIFIEDorcid.org/0000-0001-5138-564XUNSPECIFIED
URN: urn:nbn:de:hbz:38-347631
DOI: 10.1017/RDC.2019.108
Journal or Publication Title: Radiocarbon
Volume: 62
Number: 1
Page Range: S. 207 - 219
Date: 2020
Publisher: UNIV ARIZONA DEPT GEOSCIENCES
Place of Publication: TUCSON
ISSN: 1945-5755
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
CARBON; AMSMultiple languages
Geochemistry & GeophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/34763

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