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FeMnOx-1: A new microanalytical reference material for the investigation of Mn-Fe rich geological samples

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Jochum,  K. P.
Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Macholdt,  D. S.
Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Otter,  L. M.
Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Stoll,  B.
Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Weis,  U.
Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Haug,  Gerald H.
Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Andreae,  M. O.
Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Jochum, K. P., Wilson, S. A., Becker, H., Garbe-Schonberg, D., Groschopf, N., Kadlag, Y., et al. (2016). FeMnOx-1: A new microanalytical reference material for the investigation of Mn-Fe rich geological samples. Chemical Geology, 432, 34-40. doi:10.1016/j.chemgeo.2016.03.026.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-E7FD-B
Abstract
Suitable Mn-Fe rich microanalytical reference materials (MRMs) as calibration material for laser ablation-inductively coupled plasma mass spectrometry (LA-ICPMS) have not been available. The United States Geological Survey (USGS) in collaboration with the Max Planck Institute for Chemistry has prepared a synthetic MRM, FeMnOx-1, with elevated mass fractions of MnO (25 g/100 g), Fe2O3 (8.5 g/100 g) and high mass fractions of 25 trace elements varying between 200 and 5000 mg/kg. This new MRM has been designed as calibration material for a wide range of different Mn-Fe deposits, such as desert/rock varnish, ocean crusts and nodules as well as Mn accumulations in soils and lakes. Small-scale and large-scale homogeneity of FeMnOx-1 were tested with three LA systems (200 nm femtosecond, and 193 nm and 213 nm nanosecond lasers) using different spot sizes and fluences. Our results demonstrate that FeMnOx-1 is homogeneous in the pg to mu g and nm to mu m range and therefore well suited for microanalytical applications. The relative standard deviation (RSD) values obtained from repeated measurements are about 2-3% for test portion masses of 5-100 ng, and are comparable to those of the homogeneous NIST SRM610 and USGS GSE-1G reference glasses. Homogeneity of FeMnOx-1 was also verified for a test portion of 0.1 ng. Seven laboratories using five different bulk and microanalytical techniques were involved in the characterization of FeMnOx-1. Small amounts of this MRM can be obtained on request from the authors. (C) 2016 Elsevier B.V. All rights reserved.