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Data DOI: 10.1594/IEDA/100696

Barker, A., Muir, D., Majka, J., Troll, V. 2017. Precision and accuracy of glass analyses by electron microprobe (EMP) at Uppsala University, Version 1.0. Interdisciplinary Earth Data Alliance (IEDA). Accessed 2020-04-07.
Precision and accuracy of glass analyses by electron microprobe (EMP) at Uppsala University
Barker, A.
Muir, D.
Majka, J.
Troll, V.
In situ analysis of glass requires matrix-matched standards for timely assessment of the accuracy and precision of the results. We provide data to constrain the precision and accuracy of glass analyses by FEG-EMP at Uppsala University. Seven of the DING glasses that represent a broad spectrum of compositions were used to test for accuracy and precision (Jochum et al., 2006). Multiple analyses were performed on each glass; ML3B (n=30), STHs 6/80 (n=43), ATHO (n=54), KL2 (n=30), GOR-132 (n=30), GOR-128 (n=38) and T1 (n=36). Glass analysis was performed using a field emission gun JEOL JXA-8530F Hyperprobe electron probe microanalyser at Uppsala University. The analytical conditions were 15 kV accelerating voltage and 4 nA probe current with a defocused beam of 5 to 10 micron diameter. Measurements were conducted with counting times of 10 s on peak and 5 s on lower and upper background and the PRZ correction method was applied to the data. Detection limits are typically ≤150 ppm. Despite different volatile contents, the DING glasses gave totals of 97.2±2.4 (2s.d.; n=241) and have been normalized to further assess the data quality. The precision of the analyses is reported as uncertainties at the 95% confidence level for major element oxides. When concentrations are >30 wt% the uncertainties are 0.7 to 1.6% (2s.d.), for concentrations of 5 to 30 wt% uncertainties are <7% (2s.d.) and at contents of 1 to 5 wt% uncertainties are <10% (2s.d.). Comparison to the preferred values reported by Jochum et al. (2006) reveals a correlation of 1.0079.
Coverage Scope: Other
Geographic Location: experimental glass
Jochum et al., (2006) MPI-DING reference glasses for in situ microanalysis: New reference values for element concentrations and isotopes ratios. Geochemistry, Geophysics, Geosystems Q02008, doi: 10.1029/2005GC001060
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glass analyses, FEG-EMP, precision, accuracy

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