Quantification of the degree-of-isotopic-equilibrium of carbon and oxygen isotopes in mixtures of CO2 gases

Valkiers, S.; Varlam, M.; Ruβe, K.; Berglund, Michael; Taylor, Philip; Wang, J.; Milton, Martin; Bièvre, Paul De

doi:10.1016/j.ijms.2007.02.014

Cited by 14 publications

(23 citation statements)

References 14 publications

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“…The '+' indicates a lower concentration of impurities, mainly hydrocarbons [19] Table 1 shows a summary of the isotopic composition as measured at IRMM using a specially constructed isotope ratio mass spectrometer [20][21][22][23][24][25]. Surprisingly, the molar mass was higher by 3.77(21) parts in 10 6 for the argon used in the hung isotherm.…”

Section: Argon Isotopic Analysis and Chemical Puritymentioning

confidence: 99%

Acoustic Resonator Experiments at the Triple Point of Water: First Results for the Boltzmann Constant and Remaining Challenges

et al. 2010

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We report on two sets of isothermal acoustic measurements made with argon close to the triple point of water using a 50 mm radius, thin-walled, diamondturned quasisphere. Our two isotherms yielded values for the Boltzmann constant, k B , which differ by 0.9 parts in 10 6 , and have an average value of k B = (1.380 649 6 ± 0.000 004 3) × 10 −23 J · K −1 . The relative uncertainty is 3.1 parts in 10 6 , and the average value is 0.58 parts in 10 6 below the 2006 CODATA value (Mohr et al. Rev Mod Phys 80:633, 2008), and so the values are consistent within their combined (k = 1) uncertainties.

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Section: Argon Isotopic Analysis and Chemical Puritymentioning

confidence: 99%

Acoustic Resonator Experiments at the Triple Point of Water: First Results for the Boltzmann Constant and Remaining Challenges

et al. 2010

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“…Their estimate is based on the measurement of three molecular isotope ratios ( 45 R, 46 R, 47 R) to derive the atomic isotope ratios ( 13 R, 17 R, 18 R) and is therefore completely independent of other measurements, unlike the estimate derived from Nørgaard et al (1999). Based on their previous paper (Valkiers et al, 2007b), the authors emphasise the importance to achieve a statistical isotope distribution ('isotopic equilibrium') across isotopologues for their calculations to be valid, which they achieve by heating to 500°C.…”

Section: Chang Andmentioning

confidence: 99%

“…For statistical isotope distributions, the relative ion-current differences measured by the mass spectrometer can generally be equated with the relative isotope-amount ratio differences. This is not the case for non-statistical isotope distributions, though (Valkiers et al, 2007b). More specialised applications extend to m/z 47, 48 and 49 to infer deviations from the statistical abundance of poly-substituted isotopologues.…”

Section: Introductionmentioning

confidence: 99%

Reformulated 17O correction of mass spectrometric stable isotope measurements in carbon dioxide and a critical appraisal of historic ‘absolute’ carbon and oxygen isotope ratios

Kaiser

2008

Geochimica et Cosmochimica Acta

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“…The "High Score Plus" analytical software and PDF2 database were used. Energy Agency (IAEA) [52]. The standard deviation of bulk δ 13 C was typically less than ± 0.05‰ and for bulk of δ 15 N less than ± 0.3‰.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 98%

“…Isotopic ratios are reported as parts per thousand (‰) deviations from appropriate standards recognized by the IAEA [52]. The standard deviations of compound specific δ 13 C were typically less than ± 0.1‰.…”

Section: Pyrolysis Compound-specific Isotope Analysis (Py-csia)mentioning

confidence: 99%

Analytical pyrolysis and stable isotope analyses reveal past environmental changes in coralloid speleothems from Easter Island (Chile)

Miller

Rosa

Morillo

et al. 2016

Journal of Chromatography A

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This study comprises an innovative approach based on the combination of chromatography (analytical pyrolysis and pyrolysis compound-specific isotope analysis (Py-CSIA)), light stable isotopes, microscopy and mineralogy analyses to characterize the internal layering of coralloid speleothems from the Ana Heva lava tube in Easter Island (Chile). This multidisciplinary proxy showed that the speleothems consist of banded siliceous materials of low crystallinity with different mineralogical compositions and a significant contribution of organic carbon. Opal-A constitutes the outermost grey layer of the coralloids, whereas calcite and amorphous Mg hydrate silicate are the major components of the inner whitish and honey-brown layers, respectively. The differences found in the mineralogical, elemental, molecular and isotopic composition of these distinct coloured layers are related to environmental changes during speleothem development. Stable isotopes and analytical pyrolysis 3 suggested alterations in the water regime, pointing to wetter conditions during the formation of the Ca-rich layer and a possible increase in the amount of water dripping into the cave. The trend observed for δ 15 N values suggested an increase in the average temperature over time, which is consistent with the so-called climate warming during the Holocene.The pyrolysis compound-specific isotope analysis of each speleothem layer showed a similar trend with the bulk δ 13 C values pointing to the appropriateness of direct Py-CSIA in paleoenvironmental studies. The δ 13 C values for n-alkanes reinforced the occurrence of a drastic environmental change, indicating that the outermost Opal layer was developed under drier and more arid environmental conditions.

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Quantification of the degree-of-isotopic-equilibrium of carbon and oxygen isotopes in mixtures of CO2 gases

Cited by 14 publications

References 14 publications

Acoustic Resonator Experiments at the Triple Point of Water: First Results for the Boltzmann Constant and Remaining Challenges

Acoustic Resonator Experiments at the Triple Point of Water: First Results for the Boltzmann Constant and Remaining Challenges

Reformulated 17O correction of mass spectrometric stable isotope measurements in carbon dioxide and a critical appraisal of historic ‘absolute’ carbon and oxygen isotope ratios

Analytical pyrolysis and stable isotope analyses reveal past environmental changes in coralloid speleothems from Easter Island (Chile)

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