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  Effectiveness of different pre-treatments in recovering pre-burial isotopic ratios of charred plants

Brinkkemper, O., Braadbaart, F., van Os, B., van Hoesel, A., van Brussel, A., & Fernandes, R. (2018). Effectiveness of different pre-treatments in recovering pre-burial isotopic ratios of charred plants. Rapid Communications in Mass Spectrometry, 32(3), 251-261. doi:10.1002/rcm.8033.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-34FE-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-34FF-7
Genre: Journal Article

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Brinkkemper, O., Author
Braadbaart, F., Author
van Os, B., Author
van Hoesel, A., Author
van Brussel, A., Author
Fernandes, Ricardo1, Author              
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1Archaeology, Max Planck Institute for the Science of Human History, Max Planck Society, ou_2074312              

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 Abstract: Rationale: Isotopic analysis of archaeological charred plant remains offers useful archaeological information. However, adequate sample pre-treatment protocols may be necessary to provide a contamination-free isotopic signal while limiting sample loss and achieving a high throughput. Under these constraints research was undertaken to compare the performance of different pre-treatment protocols. Methods: Charred archaeological plant material was selected for isotopic analysis (δ13C and δ15N values) by Isotope Ratio Mass Spectrometry (IRMS) from a variety of plant species, time periods, and soil conditions. Preservation conditions and the effectiveness of cleaning protocols were assessed through Fourier transform infrared spectroscopy (FTIR) and X-Ray fluorescence (XRF) spectrometry. An acid-base-acid protocol, successfully employed in radiocarbon dating, was used to define a contamination-free isotopic reference. Acid-base-acid isotopic measurements were compared with those obtained from untreated material and an acid-only protocol. Results: The isotopic signals of untreated material and an acid-only protocol typically did not differ more than 1‰ from those of the acid-base-acid reference. There were no significant isotopic offsets between acid-base-acid and acid-only or untreated samples. Samples losses in an acid-base-acid protocol were on average 50±17% (maximum = 98.4%). Elemental XRF measurements showed promising results in the detection of more contaminated samples albeit with a high rate of false positives. Conclusions: For the large range of preservation conditions described in the study, untreated charred plant samples, water cleaned of sediments, provide reliable stable isotope ratios of carbon and nitrogen. The use of pre-treatments may be necessary under different preservation conditions or more conservative measurement uncertainties should be reported.

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Language(s): eng - English
 Dates: 2018-01-172018-02-15
 Publication Status: Published in print
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/rcm.8033
Other: shh934
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Title: Rapid Communications in Mass Spectrometry
  Other : Rapid Commun. Mass Spectrom.
Source Genre: Journal
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Publ. Info: New York, NY : John Wiley & Sons
Pages: - Volume / Issue: 32 (3) Sequence Number: - Start / End Page: 251 - 261 Identifier: ISSN: 0951-4198
CoNE: https://pure.mpg.de/cone/journals/resource/954925574961