Details
| Original language | English |
|---|---|
| Pages (from-to) | 449-457 |
| Number of pages | 9 |
| Journal | Geostandards and Geoanalytical Research |
| Volume | 41 |
| Issue number | 3 |
| Publication status | Published - Sept 2017 |
Abstract
The strong spectral interference between Br- and Al-induced X-ray lines hampers the utilisation of electron probe microanalysis (EPMA) for measuring Br mass fractions in Al-bearing minerals and glasses. Through measuring Br-free Al-bearing materials, we established an EPMA method to quantify the overlap from AlKα on BrLβ, which can be expressed as a linear function of the Al2O3 content. The count rate of the BrLβ peak signal was enhanced by high beam currents and long measurement times. Application of this EPMA method to Al- and Br-bearing materials, such as sodalite and scapolite, and to five experimental glasses yielded Br mass fractions (in the range of 250–4000 μg g−1) that are consistent with those measured by microbeam synchrotron X-ray fluorescence (μ-SXRF) spectrometry. The EPMA method has an estimated detection limit of ~ 100–300 μg g−1. We propose that this method is useful for measuring Br mass fractions (hundreds to thousands of μg g−1) in Al-bearing minerals and glasses, including those produced in Br-doped experiments. In addition, the natural marialitic scapolite (ON70) from Mpwapwa (Tanzania) containing homogeneously distributed high mass fractions of Br (2058 ± 56 μg g−1) and Cl (1.98 ± 0.03% m/m) is an ideal reference material for future in situ analyses.
Keywords
- aluminium, bromine, electron probe microanalysis, interference, synchrotron X-ray fluorescence spectrometry
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geology
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: Geostandards and Geoanalytical Research, Vol. 41, No. 3, 09.2017, p. 449-457.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Electron Probe Microanalysis of Bromine in Minerals and Glasses with Correction for Spectral Interference from Aluminium, and Comparison with Microbeam Synchrotron X-Ray Fluorescence Spectrometry
AU - Zhang, Chao
AU - Lin, Jinru
AU - Pan, Yuanming
AU - Feng, Renfei
AU - Almeev, Renat R.
AU - Holtz, Francois
N1 - Funding information: We thank two anonymous journal reviewers for helpful comments and Kathryn Linge for editorial handling. We also thank Prof. Jürgen Koepke (LUH) for inspiring discussions. This study was supported by a ‘Wege in die Forschung’ project (granted by Leibniz Universität Hannover to Chao Zhang) and DFG (German Research Foundation) project BE 1720/40.
PY - 2017/9
Y1 - 2017/9
N2 - The strong spectral interference between Br- and Al-induced X-ray lines hampers the utilisation of electron probe microanalysis (EPMA) for measuring Br mass fractions in Al-bearing minerals and glasses. Through measuring Br-free Al-bearing materials, we established an EPMA method to quantify the overlap from AlKα on BrLβ, which can be expressed as a linear function of the Al2O3 content. The count rate of the BrLβ peak signal was enhanced by high beam currents and long measurement times. Application of this EPMA method to Al- and Br-bearing materials, such as sodalite and scapolite, and to five experimental glasses yielded Br mass fractions (in the range of 250–4000 μg g−1) that are consistent with those measured by microbeam synchrotron X-ray fluorescence (μ-SXRF) spectrometry. The EPMA method has an estimated detection limit of ~ 100–300 μg g−1. We propose that this method is useful for measuring Br mass fractions (hundreds to thousands of μg g−1) in Al-bearing minerals and glasses, including those produced in Br-doped experiments. In addition, the natural marialitic scapolite (ON70) from Mpwapwa (Tanzania) containing homogeneously distributed high mass fractions of Br (2058 ± 56 μg g−1) and Cl (1.98 ± 0.03% m/m) is an ideal reference material for future in situ analyses.
AB - The strong spectral interference between Br- and Al-induced X-ray lines hampers the utilisation of electron probe microanalysis (EPMA) for measuring Br mass fractions in Al-bearing minerals and glasses. Through measuring Br-free Al-bearing materials, we established an EPMA method to quantify the overlap from AlKα on BrLβ, which can be expressed as a linear function of the Al2O3 content. The count rate of the BrLβ peak signal was enhanced by high beam currents and long measurement times. Application of this EPMA method to Al- and Br-bearing materials, such as sodalite and scapolite, and to five experimental glasses yielded Br mass fractions (in the range of 250–4000 μg g−1) that are consistent with those measured by microbeam synchrotron X-ray fluorescence (μ-SXRF) spectrometry. The EPMA method has an estimated detection limit of ~ 100–300 μg g−1. We propose that this method is useful for measuring Br mass fractions (hundreds to thousands of μg g−1) in Al-bearing minerals and glasses, including those produced in Br-doped experiments. In addition, the natural marialitic scapolite (ON70) from Mpwapwa (Tanzania) containing homogeneously distributed high mass fractions of Br (2058 ± 56 μg g−1) and Cl (1.98 ± 0.03% m/m) is an ideal reference material for future in situ analyses.
KW - aluminium
KW - bromine
KW - electron probe microanalysis
KW - interference
KW - synchrotron X-ray fluorescence spectrometry
UR - http://www.scopus.com/inward/record.url?scp=85017546429&partnerID=8YFLogxK
U2 - 10.1111/ggr.12169
DO - 10.1111/ggr.12169
M3 - Article
AN - SCOPUS:85017546429
VL - 41
SP - 449
EP - 457
JO - Geostandards and Geoanalytical Research
JF - Geostandards and Geoanalytical Research
SN - 1639-4488
IS - 3
ER -