Application of Multiple‐Collector Inductively Coupled Plasma Mass Spectrometry to Isotopic Analysis in Cosmochemistry

Rehkämper, Mark; Schönbächler, Maria; Andreasen, R.

doi:10.1002/9783527650484.ch10

Cited by 3 publications

(5 citation statements)

References 123 publications

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“…Availability of multicollector-inductively coupled plasma mass spectrometry (MC-ICPMS) and, to a lesser extent, multicollector-thermal ionization mass spectrometry (MC-TIMS) turned exploration of isotope abundance variations of the heavier elements quickly into a research area of its own. Possible applications under scrutiny are now countless and reach from the earth and planetary sciences, as traditional domains of stable isotope based research, to environmental and even biomedical research . In such measurements, instrumental mass bias is commonly corrected for by measuring intermittently a standard of known isotopic composition (standard sample bracketing) or by normalizing measurements to the known isotope ratios of a reference standard of another element spiked to the sample (external normalization) .…”

Section: Correction Of Instrumental Mass Bias By Double Spikingmentioning

confidence: 99%

Measurement of Isotope Abundance Variations in Nature by Gravimetric Spiking Isotope Dilution Analysis (GS-IDA)

Chew

Walczyk

2013

Anal. Chem.

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Subtle variations in the isotopic composition of elements carry unique information about physical and chemical processes in nature and are now exploited widely in diverse areas of research. Reliable measurement of natural isotope abundance variations is among the biggest challenges in inorganic mass spectrometry as they are highly sensitive to methodological bias. For decades, double spiking of the sample with a mix of two stable isotopes has been considered the reference technique for measuring such variations both by multicollector-inductively coupled plasma mass spectrometry (MC-ICPMS) and multicollector-thermal ionization mass spectrometry (MC-TIMS). However, this technique can only be applied to elements having at least four stable isotopes. Here we present a novel approach that requires measurement of three isotope signals only and which is more robust than the conventional double spiking technique. This became possible by gravimetric mixing of the sample with an isotopic spike in different proportions and by applying principles of isotope dilution for data analysis (GS-IDA). The potential and principle use of the technique is demonstrated for Mg in human urine using MC-TIMS for isotopic analysis. Mg is an element inaccessible to double spiking methods as it consists of three stable isotopes only and shows great potential for metabolically induced isotope effects waiting to be explored.

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Section: Correction Of Instrumental Mass Bias By Double Spikingmentioning

confidence: 99%

Measurement of Isotope Abundance Variations in Nature by Gravimetric Spiking Isotope Dilution Analysis (GS-IDA)

Chew

Walczyk

2013

Anal. Chem.

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“…The determination of stellar signatures hidden within the isotopic composition of meteorites via mass spectrometry is a complex task because of the analytical challenges and because of the presence of effects other than stellar nucleosynthesis that can affect the isotopic abundances. High precision isotope analysis generally requires careful chemical separation of the target element because isobaric interferences 3 must be eliminated for accurate results, and because the presence of matrix material can affect both the accuracy and precision of the instrumental analysis [61]. There are two types of isotopic variation found in meteorites: mass depen-dent and mass independent and they are briefly described below.…”

Section: Methodsmentioning

confidence: 99%

“…There are two types of isotopic variation found in meteorites: mass depen-dent and mass independent and they are briefly described below. For a more comprehensive discussion on the different types of isotope variations found in meteorites and their components we refer the reader to the reviews by Rehkämper et al [61] and Dauphas and Schauble [18].…”

Section: Methodsmentioning

confidence: 99%

“…As the name indicates, this type of fractionation is a function of the isotope mass and occurs during kinetic fractionation, where light isotopes are often enriched in the reaction product, and equilibrium reactions, where the heavy isotopes are generally enriched in the material with the stiffest chemical bonds [62]. Mass-dependent fractionation occurs during instrumental analysis (see [18,61] for reviews) and chemical separation of the element via ion exchange chromatography, although this can generally be avoided if more than 95% of the target element is recovered during the chemical procedure. Correcting for MDF is therefore a vital step in the processing of isotope data.…”

Section: Methodsmentioning

confidence: 99%

“…The MDF effects from such kind of measurements are usually in the permil range for TIMS and percent range for MC-ICPMS. The exact degree of MDF needs to be determined for each measurement (see, e.g., [61,66,67]) and changes with time during analysis. The TIMS and MC-ICPMS analyses yield degrees of MDF that are often significantly larger than any observed natural mass-dependent and mass-independent variation (although in some instances nucleosynthetic effects in stardust and leachate samples can be larger), and are routinely corrected for by internal normalisation schemes.…”

Section: Internal Normalisation Proceduresmentioning

confidence: 99%

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Representation of s-process abundances for comparison to data from bulk meteorites

Lugaro

Pető

et al. 2023

Eur. Phys. J. A

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Analysis of bulk meteorite compositions has revealed small isotopic variations due to the presence of material (e.g., stardust) that preserved the signature of nuclear reactions occurring in specific stellar sites. The interpretation of such anomalies provides evidence for the environment of the birth of the Sun, its accretion process, the evolution of the solar proto-planetary disk, and the formation of the planets. A crucial element of such interpretation is the comparison of the observed anomalies to predictions from models of stellar nucleosynthesis. To date, however, this comparison has been limited to a handful of model predictions. This is mostly because the calculated stellar abundances need to be transformed into a specific representation, which nuclear astrophysicists and stellar nucleosynthesis researchers are not familiar with. Here, we show in detail that this representation is needed to account for mass fractionation effects in meteorite data that can be generated both in nature and during instrumental analysis. We explain the required internal normalisation to a selected isotopic ratio, describe the motivations behind such representation more widely, and provide the tools to perform the calculations. Then, we present some examples considering two elements produced by the slow neutron-capture (s) process: Sr and Mo. We show which specific representations for the Sr isotopic composition calculated by s-process models better disentangle the nucleosynthetic signatures from stars of different metallicity. For Mo, the comparison between data and models is improved due to a recent re-analysis of the $$^{95}$$ 95 Mo neutron-capture cross section.

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Use of Multi-collector ICP-MS for Studying Biogeochemical Metal Cycling

Li¹,

Wu²,

Schiff³

2019

Analytical Geomicrobiology

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Application of Multiple‐Collector Inductively Coupled Plasma Mass Spectrometry to Isotopic Analysis in Cosmochemistry

Cited by 3 publications

References 123 publications

Measurement of Isotope Abundance Variations in Nature by Gravimetric Spiking Isotope Dilution Analysis (GS-IDA)

Measurement of Isotope Abundance Variations in Nature by Gravimetric Spiking Isotope Dilution Analysis (GS-IDA)

Representation of s-process abundances for comparison to data from bulk meteorites

Use of Multi-collector ICP-MS for Studying Biogeochemical Metal Cycling

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