High‐precision <sup>34</sup>S/<sup>32</sup>S measurements in vertebrate bioapatites using purge‐and‐trap elemental analyser/isotope ratio mass spectrometry technology

Goedert, Jean; Fourel, François; Amiot, Romain; Simon, Laurent; Lécuyer, Christophe

doi:10.1002/rcm.7690

Cited by 10 publications

(5 citation statements)

References 31 publications

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“…It was considered that this may be partly due to sample heterogeneity at a very fine scale. If this outlier was excluded, precisions of ~0.4‰ (1σ) were obtained for all reference materials, which are similar to that achieved by other laboratories using the cryogenic technique (Goedert et al, 2016;Takahashi et al, 2018).…”

Section: Resultssupporting

confidence: 79%

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Measurements of Sulfur Isotope Composition on Ultrasmall (80 Nanomole) Sulfide and Sulfate Samples by a Modified EA‐IRMS

Fan

Bin

et al. 2022

Acta Geologica Sinica (Eng)

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The traditional method for sulfur isotope measurement using EA-IRMS commonly requires sulfur content greater than 2 μmol. Such a large sample size limits its application to low-S materials, the size mainly being due to ineffective utilization of sample gas, almost 99.7% of which is discarded with carrier gas through the split port of the continuous-flow interface. A modified EA-IRMS system with a gas chromatographic (GC) column and a custom-built cryogenic concentration device is used in this study. We measured six reference materials to test the performance of this method. The results were consistent with those obtained through traditional EA-IRMS. Precisions ranging from ±0.24‰ to ±0.76‰ (1σ) can be obtained with samples equivalent to ~80 nmol sulfur, which were similar to results obtained from an alternative method using an absorption column. Our improved method is a powerful tool for sulfur isotope measurement in ultrasmall sulfide and sulfate samples, which can be further applied to carbon, nitrogen and oxygen isotope analyses of samples at about 100 nmol level.

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Section: Resultssupporting

confidence: 79%

“…Measurement of sulfur isotope ratios ( 34 S/ 32 S) in low Sbearing materials has remained challenging in recent years (Fourel et al, 2015). Fourel et al (2014) and Goedert et al (2016) measured phosphate minerals with low-S concentration (<1%) using a novel elemental analyzer, based on 'purge and trap' technology, although a…”

Section: Introductionmentioning

confidence: 99%

Measurements of Sulfur Isotope Composition on Ultrasmall (80 Nanomole) Sulfide and Sulfate Samples by a Modified EA‐IRMS

Fan

Bin

et al. 2022

Acta Geologica Sinica (Eng)

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“…Because sulfur may substitute for phosphate as sulfate in bioapatite, its investigation in fossil bone and teeth offers potential in the fossil record (Koch ; Goedert et al . ).…”

Section: Traditional Isotopes In Palaeobiologymentioning

confidence: 97%

Non‐traditional isotope perspectives in vertebrate palaeobiology

2017

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The recent development of Multi-Collector Inductively Coupled PlasmaMass Spectrometry (MC-ICPMS), notably in the disciplines of earth sciences, now allows the measurement of precise isotope ratios, even under low concentration. Nontraditional isotope systems, such as alkaline earth (Ca, Mg) and transition (Cu, Fe, Zn) metals are now being measured in a variety of biological tissues, including bone and teeth. Although our understanding of the environmental and biological mechanisms behind the fractionation of such elements is still in its infancy, some of these isotopes are suspected to fractionate along the food chain as has been reported in the literature for calcium, magnesium and zinc. Other geochemical methods, such as concentration analyses permit a prior assessment of diagenesis in the fossils to be analysed and such an approach allows recognising that in some circumstances, not only enamel but also dentine or bone can preserve its original biogenic composition. The aims here are to review the current knowledge surrounding these various isotopic tools, address their potential preservation in biological apatite and provide the palaeobiologist a guide on the different toolkits available and discuss their potential applications in vertebrate palaeobiology with a case study involving two mammal assemblages from the Pleistocene of Europe.Key words: non-traditional isotopes, palaeobiology, calcium, cave bear, Pleistocene.GEOCHEMICAL tools are a great asset to infer biological characteristics in fossil organisms that otherwise would remain completely unnoticed with morphological 2 observations alone. Among stable isotopes, carbon (C), oxygen (O) and nitrogen (N) have been and are still widely used in ecology, archaeology and in palaeoecology.From the vertebrate individual organism to the community, it is possible to reconstruct body temperatures and infer thermophysiology, reconstruct ambient palaeoenvironmental conditions and infer habitat use and migrations; and last but not least to reconstruct diet and trophic structures in ancient food webs. Most isotope approaches rely on stable isotope ratios of carbon and oxygen but also on radiogenic strontium preserved in fossilised tooth and bone. Elemental concentrations have also proved useful in many contexts such as dietary inference. For example, elemental ratios of strontium to calcium or barium to calcium allow reconstructing ecosystem structures.Contrary to light isotope systems, which have a variability beyond 10 ‰, nontraditional isotopes comprising alkaline earths (Ca, Mg) or transition metals (Cu, Fe, Zn), show isotope variability within a maximum range of 2-3‰. Recent analytical progresses from the domains of earth sciences now allow the measurement of such stable isotope systems, which show limited fractionation and require high precision and accuracy of measurements from mass spectrometers. The main basis for all those geochemical applications is already starting to be applied to archaeological studies (see review by Jaouen and Pons, 2016...

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“…For each bone apatite sample, 3 aliquots of 7 mg of bioapatite powder were mixed with 20 mg of pure tungsten oxide (WO3) powder and loaded in tin foil capsules. Tungsten oxide is a powerful oxidant ensuring the full thermal decomposition of apatite sulfate into sulfur dioxide (SO 2 ) gas (Goedert et al, 2016). Measurements have been calibrated against the NBS 127 (barium sulfate, BaSO 4 d 34 S = + 20.3 ‰ V-CDT; Halas and Szaran, 2001) and S1 (silver sulfide, Ag 2 S d 34 S = − 0.3 ‰ V-CDT; Robinson, 1995) international standards.…”

Section: Sulfur Isotope Analysis Of Bioapatitementioning

confidence: 99%

“…Measurements have been calibrated against the NBS 127 (barium sulfate, BaSO 4 d 34 S = + 20.3 ‰ V-CDT; Halas and Szaran, 2001) and S1 (silver sulfide, Ag 2 S d 34 S = − 0.3 ‰ V-CDT; Robinson, 1995) international standards. For each analytical run of bone samples, we have also analysed BCR32 samples (S % = 0.72, certified value (Community Bureau of Reference, 1982); d 34 S = + 18.4 ‰ V-CDT (Fourel et al, 2015;Goedert et al, 2016)) as a compositional (S % = 0.81 ± 0.1 %) and isotopic standard (d 34 S = + 18.3 ± 0.1 ‰ V-CDT) to ensure that analytical conditions were optimal to perform sulfur isotope analyses of samples with low-S content. The sample average standard deviation for d 34 S measurements is 0.5 ‰ ± 0.3 ‰ (s.e.m).…”

Section: Sulfur Isotope Analysis Of Bioapatitementioning

confidence: 99%

Multi-isotopic analysis reveals the early stem turtle Odontochelys as a nearshore herbivorous forager

Goedert,

Amiot,

Anquetin

et al. 2023

Front. Ecol. Evol.

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IntroductionAfter decades of debate on the origin of turtles, it is now widely accepted that they are diapsid reptiles originating in the Permian from a terrestrial ancestor. It seems that the initial development of the structures that will later form the unique turtle bony shell took place as a response to a fossorial lifestyle. However, the earliest stem turtle with a fully complete plastron, Odontochelys semitestacea from the Late Triassic (lower Carnian) of China, is somewhat controversially interpreted as an aquatic or even a marine form, raising the question of the environment in which the completion of the plastron happened.MethodsHere, we analyzed the stable carbon, oxygen and sulfur isotope compositions (δ13C, δ18O and δ34S) of bones from two specimens of Odontochelys along with bones and teeth of two associated specimens of the marine ichthyosaur Guizhouichthyosaurus tangae.Results and discussionWe first show that δ18O values of Odontochelys are incompatible with a terrestrial lifestyle and imply a semi-aquatic to aquatic lifestyle. Isotopic results also demonstrate that the aquatic environment of Odontochelys was submitted to a strong marine influence, therefore excluding the possibility of a strict freshwater aquatic environment. Additionally, an unusual carbon isotope composition shows that O. semitestacea was herbivorous, probably consuming macrophytic algae in coastal zones like the extant green sea turtle (Chelonia mydas) or the marine iguana (Amblyrhynchus cristatus) do.

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High‐precision ³⁴S/³²S measurements in vertebrate bioapatites using purge‐and‐trap elemental analyser/isotope ratio mass spectrometry technology

Abstract: Sulfur isotope analysis of bioapatite has great potential to track the living environment of extinct vertebrates for which only fossilised bones or teeth have been preserved. Copyright © 2016 John Wiley & Sons, Ltd.

Cited by 10 publications

References 31 publications

Measurements of Sulfur Isotope Composition on Ultrasmall (80 Nanomole) Sulfide and Sulfate Samples by a Modified EA‐IRMS

Measurements of Sulfur Isotope Composition on Ultrasmall (80 Nanomole) Sulfide and Sulfate Samples by a Modified EA‐IRMS

Non‐traditional isotope perspectives in vertebrate palaeobiology

Multi-isotopic analysis reveals the early stem turtle Odontochelys as a nearshore herbivorous forager

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High‐precision 34S/32S measurements in vertebrate bioapatites using purge‐and‐trap elemental analyser/isotope ratio mass spectrometry technology

Abstract: Sulfur isotope analysis of bioapatite has great potential to track the living environment of extinct vertebrates for which only fossilised bones or teeth have been preserved. Copyright © 2016 John Wiley & Sons, Ltd.

Cited by 10 publications

References 31 publications

Measurements of Sulfur Isotope Composition on Ultrasmall (80 Nanomole) Sulfide and Sulfate Samples by a Modified EA‐IRMS

Measurements of Sulfur Isotope Composition on Ultrasmall (80 Nanomole) Sulfide and Sulfate Samples by a Modified EA‐IRMS

Non‐traditional isotope perspectives in vertebrate palaeobiology

Multi-isotopic analysis reveals the early stem turtle Odontochelys as a nearshore herbivorous forager

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High‐precision ³⁴S/³²S measurements in vertebrate bioapatites using purge‐and‐trap elemental analyser/isotope ratio mass spectrometry technology