Journal ArticleDOI
Isotopic standards for carbon and oxygen and correction factors for mass-spectrometric analysis of carbon dioxide
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TLDR
In this paper, Niee's and Solenhofen standards were compared to the Chicago PDB standard for carbon and oxygen isotope ratios, and the correction factors for instrumental effects and for the nature of the mass spectra were derived.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 1957-01-01. It has received 4071 citations till now. The article focuses on the topics: Carbon & Carbon dioxide.read more
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Structure of tropical river food webs revealed by stable isotope ratios
TL;DR: Although isotope ratios could not resolve species-level feeding pathways, they did reveal how top consumers integrate isotopic variability occurring lower in the food web.
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Stable‐Carbon Isotope Variability in Tree Foliage and Wood
Steven W. Leavitt,Austin Long +1 more
TL;DR: Variation of stable-carbon isotope ratios (13C/'2C) in trees of genera Juniperus and Pinus under field conditions is documents to help guide sampling in tracer-type studies with stable- carbon isotopes and aid in the interpretation of isotopic results from such studies.
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Large shifts in the isotopic composition of seawater sulphate across the Permo–Triassic boundary in northern Italy
TL;DR: Carbonate-associated sulphate (CAS) extracted from a Permo-Triassic succession at Siusi in northern Italy is shown to preserve a true seawater-sulphate isotope record.
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25 Years of trospheric 14C observations
Ingeborg Levin,Bernd Kromer,Hildegard Schoch-Fischer,Michael Bruns,Marianne Münnich,Dietrich Berdau,J.C. Vogel,Karl Otto Münnich +7 more
TL;DR: In this paper, a long-term mountain station series of tropospheric 14C data for the period 1959 to 1984 is presented, which is considered representative of the higher altitude 14C level over central Europe.
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13C abundances of nutrients and the effect of variations in 13C isotopic abundances of test meals formulated for 13CO2 breath tests.
TL;DR: Investigation of the breath 13CO2 response to individual 13C-labeled dietary constituents demonstrated that amino acids produced the earliest 13 CO2 response followed in order by medium chain triglyceride, carbohydrates, and long chain triglycerides.
References
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On the Isotopic Chemistry of Carbonates and a Paleotemperature Scale
TL;DR: In this paper, the temperature variation of the fractionation of oxygen in exchange reactions between dissolved carbonate and water and between calcite and water was calculated on theoretical grounds, and checked experimentally.
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Variation of O18 content of waters from natural sources
S Epstein,Toshiko K. Mayeda +1 more
TL;DR: A number of marine water and fresh water samples were examined for the relative O18O16 ratio, and the variation of this ratio was determined to a precision of ± 1% as mentioned in this paper.
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Revised carbonate-water isotopic temperature scale
TL;DR: The relationship between temperature and O(18) content relative to that for a Cretaceous belemnite of the Pee Dee formation previously reported (Epstein, Buchsbaum, Lowenstam, and Urey, 1951) has been re-determined using modified procedures for removing organic matter from shells, and is found to be 16.5 - 4.3 δ + 0.14 δ^2
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The geochemistry of the stable carbon isotopes
TL;DR: A survey of the variation of the ratio C13/C12 in nature can be found in this paper, where Urey and his co-workers used two complete feed systems with magnetic switching to determine small differences in isotope ratios between samples and a standard gas.