V033-0008
New calcium carbonate reference material NFHS-2-NP for LA-ICP-OES, LA-(MC)-ICP-MS or µXRF

Monday, 14 December 2020
Poster
Wim Boer1, Lennart de Nooijer1, Michael Weber2, Regina Mertz-Kraus2, Denis Scholz2, Simon Nordstad3 and Gert-Jan Reichart1,4, (1)NIOZ, Royal Netherlands Institute for Sea Research, Department of Ocean Systems, and Utrecht University, Fac Geosci, Dept Earth Sci, Texel, Netherlands, (2)Institute for Geosciences, Johannes Gutenberg-Universität, Mainz, Germany, (3)myStandards GmbH, Kiel, Germany, (4)Utrecht University, Fac Geosci, Dept Earth Sci, Utrecht, Netherlands
Abstract:
Element concentrations and isotope ratios in carbonates are valuable tools for paleoclimate and environmental reconstructions. Some applications require elemental and isotope data at high spatial resolution, for instance to reconstruct past temperatures from bivalve, coral or speleothem records. Advanced techniques, such as LA-(MC)-ICP-MS, LIBS or µXRF, offer this excellent resolution in combination with multi-element detection or isotope ratio determination. Measured intensities can only be transformed into accurate elemental concentrations and isotope ratios using reference materials (RMs) with known chemical composition. The commonly used RMs include glasses and pressed powder pellets. Using such glass RMs can potentially introduce so-called matrix effects (e.g., Sylvester[1]), while using powder pellets could bias the results caused by heterogeneity of the RM. To overcome such limitations, we have developed a matrix-matched RM, NFHS-2-NP (NIOZ Foram House Standard-2-Nano Pellet), with element concentrations and isotope composition resembling those of natural calcium carbonate. Adapting the technique described by Garbe-Schönberg and Müller[2], planktonic foraminifera, were milled to nano-particles using a wet-milling technique and pressed to a pellet without adding any binder. To determine the reference values for the element concentrations as well as isotope ratios (including B, Na, Mg, Al, Mn, Zn, Sr, Ba and d11B, 87Sr/86Sr) for NFHS-2-NP, the material was and will be further analysed by solution ICP-MS/OES, MC-ICP-MS, ID-MS, WD-XRF and TIMS. With respect to elemental concentrations, inter- and intra-pellet homogeneity was tested by multiple LA-ICP-MS analyses in several laboratories using different spot sizes. The LA-ICP-MS results for the monitored elements had relative standard deviations of <3 % for most elements demonstrating that homogeneity of the nano-pellet compared to other powder pellets (e.g. USGS MACS 3 [3]) was significantly improved. Strontium isotope ratios for NFHS-2-NP were established by solution MC-ICP-MS and homogeneity was verified by repeated LA-MC-ICP-MS analyses.

[1] Sylvester (2008) Mineralogical Association of Canada, Short Course Series, 40

[2] Garbe-Schönberg and Müller (2014) J.Anal.At.Spectrom., 29

[3] Jochum et al. (2012) Chem. Geol., 318

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