New calcium carbonate nano‐particulate pressed powder pellet (NFHS‐2‐NP) for LA‐ICP‐OES, LA‐(MC)‐ICP‐MS and µXRF

Abstract

A new matrix-matched reference material has been developed – NFHS-2-NP (NIOZ Foraminifera House Standard-2-Nano-Pellet) – with element mass fractions, and isotope ratios resembling that of natural foraminiferal calcium carbonate. A 180–355 µm size fraction of planktic foraminifera was milled to nano-particles and pressed to pellets. We report reference and information values for mass fractions of forty-six elements measured by six laboratories as well as for ⁸⁷Sr/ ⁸⁶Sr (three laboratories), δ ¹³C, δ ¹⁸O (five laboratories) and ^206,207,208Pb/ ²⁰⁴Pb isotope ratios (one laboratory) determined by ICP-MS, ICP-OES, MC-ICP-MS, isotope ratio mass spectrometry, WD-XRF and TIMS. Inter- and intra-pellet elemental homogeneity was tested using multiple LA-ICP-MS analyses in two laboratories applying spot sizes of 60 and 70 µm. The LA-ICP-MS results for most of the elements relevant as proxies for palaeoclimate research show RSD values < 3%, demonstrating a satisfactory homogeneous composition. Homogeneity of ⁸⁷Sr/ ⁸⁶Sr ratios of the pellet was verified by repeated LA-MC-ICP-MS by two laboratories. Information values are reported for Pb isotope ratios and δ ¹³C, δ ¹⁸O values. The homogeneity for these isotope systems remains to be tested by LA-MC-ICP-MS and secondary-ion mass spectrometry. Overall, our results confirm the suitability of NFHS-2-NP for calibration or monitoring the quality of in situ geochemical techniques.

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