Graphitization of Small Carbonate Samples for Paleoceanographic Research at the Godwin Radiocarbon Laboratory, University of Cambridge

E. Freeman, L. C. Skinner, R. Reimer, A. Scrivner, S. Fallon

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    A new radiocarbon preparation facility was set up in 2010 at the Godwin Laboratory for Palaeoclimate Research, at the University of Cambridge. Samples are graphitized via hydrogen reduction on an iron powder catalyst before being sent to the Chrono Centre, Belfast, or the Australian National University for accelerator mass spectrometry (AMS) analysis. The experimental setup and procedure have recently been developed to investigate the potential for running small samples of foraminiferal carbonate. By analyzing background values of samples ranging from 0.04 to 0.6 mg C along with similar sized secondary standards, the setup and experimental procedures were optimized for small samples. “Background” modern 14C contamination has been minimized through careful selection of iron powder, and graphitization has been optimized through the use of “small volume” reactors, allowing samples containing as little as 0.08 mg C to be graphitized and accurately dated. Graphitization efficiency/fractionation is found not to be the main limitation on the analysis of samples smaller than 0.07 mg C, which rather depends primarily on AMS ion beam optics, suggesting further improvements in small sample analysis might yet be achieved with our methodology.
    LanguageEnglish
    Pages89-97
    Number of pages9
    JournalRadiocarbon
    Volume58
    Issue number1
    Early online date05 Jan 2016
    DOIs
    Publication statusPublished - Mar 2016

    Fingerprint

    graphitization
    accelerator mass spectrometry
    carbonate
    iron
    paleoclimate
    fractionation
    catalyst
    hydrogen
    methodology
    ion
    laboratory
    analysis
    Small Sample
    Radiocarbon
    Carbonate
    Iron
    Accelerator Mass Spectrometry

    Cite this

    @article{6a64fc86377749838e717d3001f17ce0,
    title = " Graphitization of Small Carbonate Samples for Paleoceanographic Research at the Godwin Radiocarbon Laboratory, University of Cambridge",
    abstract = "A new radiocarbon preparation facility was set up in 2010 at the Godwin Laboratory for Palaeoclimate Research, at the University of Cambridge. Samples are graphitized via hydrogen reduction on an iron powder catalyst before being sent to the Chrono Centre, Belfast, or the Australian National University for accelerator mass spectrometry (AMS) analysis. The experimental setup and procedure have recently been developed to investigate the potential for running small samples of foraminiferal carbonate. By analyzing background values of samples ranging from 0.04 to 0.6 mg C along with similar sized secondary standards, the setup and experimental procedures were optimized for small samples. “Background” modern 14C contamination has been minimized through careful selection of iron powder, and graphitization has been optimized through the use of “small volume” reactors, allowing samples containing as little as 0.08 mg C to be graphitized and accurately dated. Graphitization efficiency/fractionation is found not to be the main limitation on the analysis of samples smaller than 0.07 mg C, which rather depends primarily on AMS ion beam optics, suggesting further improvements in small sample analysis might yet be achieved with our methodology.",
    author = "E. Freeman and Skinner, {L. C.} and R. Reimer and A. Scrivner and S. Fallon",
    year = "2016",
    month = "3",
    doi = "10.1017/RDC.2015.8",
    language = "English",
    volume = "58",
    pages = "89--97",
    journal = "Radiocarbon",
    issn = "0033-8222",
    publisher = "University of Arizona",
    number = "1",

    }

     Graphitization of Small Carbonate Samples for Paleoceanographic Research at the Godwin Radiocarbon Laboratory, University of Cambridge. / Freeman, E.; Skinner, L. C.; Reimer, R.; Scrivner, A.; Fallon, S.

    In: Radiocarbon, Vol. 58, No. 1, 03.2016, p. 89-97.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 -  Graphitization of Small Carbonate Samples for Paleoceanographic Research at the Godwin Radiocarbon Laboratory, University of Cambridge

    AU - Freeman, E.

    AU - Skinner, L. C.

    AU - Reimer, R.

    AU - Scrivner, A.

    AU - Fallon, S.

    PY - 2016/3

    Y1 - 2016/3

    N2 - A new radiocarbon preparation facility was set up in 2010 at the Godwin Laboratory for Palaeoclimate Research, at the University of Cambridge. Samples are graphitized via hydrogen reduction on an iron powder catalyst before being sent to the Chrono Centre, Belfast, or the Australian National University for accelerator mass spectrometry (AMS) analysis. The experimental setup and procedure have recently been developed to investigate the potential for running small samples of foraminiferal carbonate. By analyzing background values of samples ranging from 0.04 to 0.6 mg C along with similar sized secondary standards, the setup and experimental procedures were optimized for small samples. “Background” modern 14C contamination has been minimized through careful selection of iron powder, and graphitization has been optimized through the use of “small volume” reactors, allowing samples containing as little as 0.08 mg C to be graphitized and accurately dated. Graphitization efficiency/fractionation is found not to be the main limitation on the analysis of samples smaller than 0.07 mg C, which rather depends primarily on AMS ion beam optics, suggesting further improvements in small sample analysis might yet be achieved with our methodology.

    AB - A new radiocarbon preparation facility was set up in 2010 at the Godwin Laboratory for Palaeoclimate Research, at the University of Cambridge. Samples are graphitized via hydrogen reduction on an iron powder catalyst before being sent to the Chrono Centre, Belfast, or the Australian National University for accelerator mass spectrometry (AMS) analysis. The experimental setup and procedure have recently been developed to investigate the potential for running small samples of foraminiferal carbonate. By analyzing background values of samples ranging from 0.04 to 0.6 mg C along with similar sized secondary standards, the setup and experimental procedures were optimized for small samples. “Background” modern 14C contamination has been minimized through careful selection of iron powder, and graphitization has been optimized through the use of “small volume” reactors, allowing samples containing as little as 0.08 mg C to be graphitized and accurately dated. Graphitization efficiency/fractionation is found not to be the main limitation on the analysis of samples smaller than 0.07 mg C, which rather depends primarily on AMS ion beam optics, suggesting further improvements in small sample analysis might yet be achieved with our methodology.

    U2 - 10.1017/RDC.2015.8

    DO - 10.1017/RDC.2015.8

    M3 - Article

    VL - 58

    SP - 89

    EP - 97

    JO - Radiocarbon

    T2 - Radiocarbon

    JF - Radiocarbon

    SN - 0033-8222

    IS - 1

    ER -