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Issue 9, 2012
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A comparison of mm scale resolution techniques for element analysis in sediment cores

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Abstract

Laminated sediment records from the oxygen minimum zone in the Arabian Sea offer unique ultrahigh-resolution archives for deciphering climate variability in the Arabian Sea region. Although numerous analytical techniques are available it has become increasingly popular during the past decade to analyze relative variations of sediment cores' chemical signature by non-destructive X-ray fluorescence (XRF) core scanning. We carefully selected an approximately 5 m long sediment core from the northern Arabian Sea (GeoB12309-5: 24:52.3°N; 62:59.9°E, 956 m water depth) for a detailed, comparative study of high-resolution techniques, namely non-destructive XRF core scanning (0.8 mm resolution) and ICP-MS/OES analysis on carefully selected, discrete samples (1 mm resolution). The aim of our study was to more precisely define suitable chemical elements that can be accurately analyzed and to determine which elemental ratios can be interpretated down to sub-millimeter-scale resolutions. Applying the Student's t-test our results show significantly correlating (1% significance level) elemental patterns for all S, Ca, Fe, Zr, Rb, and Sr, as well as the K/Ca, Fe/Ti and Ti/Al ratios that are all related to distinct lithological changes. After careful consideration of all errors for the ICP analysis we further provide respective factors of XRF Core Scanner software error's underestimation by applying χ2-tests, which is especially relevant for elements with high count rates. As demonstrated by these new, ultra-high resolution data core scanning has major advantages (high-speed, low costs, few sample preparation steps) and represents an increasingly required alternative over the time consuming, expensive, elaborative, and destructive wet chemical analyses (e.g., by ICP-MS/OES after acid digestions), and meanwhile also provides high-quality data in unprecedented resolution.

Graphical abstract: A comparison of mm scale resolution techniques for element analysis in sediment cores

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Publication details

The article was received on 17 Nov 2011, accepted on 19 Jun 2012 and first published on 19 Jun 2012


Article type: Technical Note
DOI: 10.1039/C2JA30148B
Citation: J. Anal. At. Spectrom., 2012,27, 1574-1584
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    A comparison of mm scale resolution techniques for element analysis in sediment cores

    D. Wilhelms-Dick, T. Westerhold, U. Röhl, F. Wilhelms, C. Vogt, T. J. J. Hanebuth, H. Römmermann, M. Kriews and S. Kasten, J. Anal. At. Spectrom., 2012, 27, 1574
    DOI: 10.1039/C2JA30148B

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