Isotopic analysis of organic compounds and metal isotope analysis by mass spectrometry with soft ionization techniques

1988 ◽  
Vol 39 (6) ◽  
pp. 530
Author(s):  
W.D. Lehmann
Keyword(s):  
Mass Spectrometry ◽  
Organic Compounds ◽  
Isotope Analysis ◽  
Isotopic Analysis ◽  
Soft Ionization

Compound Specific Stable Sulfur Isotope Analysis (δ34S and δ33S) of Organic Compounds Using Gas Chromatography Hyphenated with Multiple Collector Inductively Coupled Plasma Mass Spectrometry (GC-MC-ICPMS)

2020 ◽  
Author(s):  
Kümmel Steffen ◽  
Gelman Faina ◽  
Horst Axel ◽  
Strauß Harald ◽  
Gehre Matthias
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Organic Compounds ◽  
Inductively Coupled Plasma ◽  
Sulfur Isotope ◽  
Sulfur Isotopes ◽  
Isotope Analysis ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Stable Sulfur Isotope

<p>Stable sulfur isotope analysis is potentially applicable in various fields in forensics and environmental analytics to investigate the sources and degradation of organic compounds, many of them being priority pollutants in groundwater and the atmosphere. A broader use of sulfur isotopes of organic compounds in environmental studies is still hampered by the availability of precise and easy-to-use techniques. Here we present a method for the determination of stable sulfur isotope ratios using gas chromatography coupled with multiple-collector inductively coupled plasma mass spectrometry (GC-MC-ICPMS) which can be used for both δ<sup>34</sup>S and δ<sup>33</sup>S analysis. The method was evaluated using the reference materials IAEA-S-1, IAEA-S-2 and IAEA-S-3 which were converted offline to SF<sub>6</sub> prior to analysis. Standardization was carried out by using a two-point calibration approach. The δ<sup>34</sup>S values obtained by our method are in good agreement (within analytical uncertainty) with the results obtained by the conventional dual inlet method. Additionally, the impact of the used mass resolution (low and medium), the influence of auto-protonation of sulfur isotopes and the effect of isobaric interferences of O<sub>2</sub><sup>+</sup> on the obtained isotopic ratios was investigated. The analytical precision (1σ) for δ<sup>34</sup>S and δ<sup>33</sup>S values was usually better than ±0.1 ‰ for analytes containing >0.1 nmol S. Thus, the presented compound-specific online method should be sufficiently precise to address a wide variety of research questions involving mass independent isotope effects of sulfur-containing organic compounds to discriminate sources or biological and chemical reactions in the environment.</p>

scholarly journals Beryl Reference Materials for In Situ Oxygen Isotope Determination

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1322
Author(s):  
Xiaoxiao Ling ◽  
Qiuli Li ◽  
Lianjun Feng ◽  
Di Zhang ◽  
Yu Liu ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Oxygen Isotope ◽  
Reference Materials ◽  
Secondary Ion Mass Spectrometry ◽  
Isotope Analysis ◽  
High Sensitivity ◽  
Isotope Ratio Mass Spectrometry ◽  
Isotopic Analysis ◽  
Good Tool

The mineral beryl (Be3Al2(SiO3)6) has the most abundant phase with industrial value for extracting a critical metal—beryllium. Due to multi-stage, fluid-induced growth, individual beryl grains may yield complex geochemical records, revealing variations in the oxygen isotopes of the fluids from which they crystallize. Secondary ion mass spectrometry (SIMS) with high sensitivity and high spatial resolution represents a good tool for in situ isotopic analysis. SIMS oxygen analyses require matrix-matched reference materials to calibrate instrumental mass fractionations during measurement. In this work, the oxygen isotope homogeneities of six beryl samples with different compositions (BS1, BS2, BS3, BS4, BS5, and BS6) were documented by SIMS. These samples’ recommended oxygen isotope compositions were characterized by laser fluorination isotope ratio mass spectrometry (IRMS). This study suggests that there is no matrix effect related to composition variation in beryl SIMS oxygen isotope analysis. The recommended δ18O values of the four reference materials, BS1, BS2, BS4, and BS5, were 15.01 ± 0.34‰ (2 standard deviations, 2 SD), 7.53 ± 0.16‰ (2 SD), 2.38 ± 0.14‰ (2 SD), and 10.72 ± 0.44‰ (2 SD), respectively. Therefore, BS1, BS2, BS4, and BS5 are recommended as suitable reference materials for in situ mineral beryl oxygen isotope microanalysis.

Molybdenum isotopic analysis by negative thermal ionization mass spectrometry (N-TIMS): effects on oxygen isotopic composition

2016 ◽  
Vol 31 (4) ◽  
pp. 948-960 ◽  
Author(s):  
Yuichiro Nagai ◽  
Tetsuya Yokoyama
Keyword(s):  
Mass Spectrometry ◽  
Thermal Ionization Mass Spectrometry ◽  
Isotope Composition ◽  
Isotope Analysis ◽  
Isotopic Analysis ◽  
Thermal Ionization ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
O Isotope ◽  
Thermal Ionization Mass

We developed a new, highly precise, and accurate Mo isotope analysis by thermal ionization mass spectrometry in negative ionization mode (N-TIMS) by determining the in situ O isotope composition for each measurement and using the data to correct for the O isotope interferences.

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