Journal ArticleDOI
Standard for Reporting Concentrations of Deuterium and Oxygen-18 in Natural Waters.
TLDR
A standard, based on the set of ocean water samples used by Epstein and Mayeda to obtain a reference standard for oxygen-18 data, but defined relative to the National Bureau of Standards isotopic reference water sample, is proposed for reporting both deuterium and oxygen- 18 variations in natural watersrelative to the same water.Abstract:
A standard, based on the set of ocean water samples used by Epstein and Mayeda to obtain a reference standard for oxygen-18 data, but defined relative to the National Bureau of Standards isotopic reference water sample, is proposed for reporting both deuterium and oxygen-18 variations in natural waters relative to the same water. The range of absolute concentrations of both isotopes in meteoric-waters is discussed.read more
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Book ChapterDOI
Stable Isotope Analysis of Food and Beverages by Nuclear Magnetic Resonance
TL;DR: In this article, the authors used isotopic dilution to estimate the linearity of the NMR response and therefore the consistency of possible systematic errors, and then compared the accuracy of NMR determinations with those of the balance.
Journal ArticleDOI
Present state of the solid and liquid density standards
TL;DR: A density standard based on a single-crystal silicon sphere has been developed at national metrology institutes, where the mass of the 1 kg silicon sphere is compared with that of the mass standard traceable to the prototype of the kilogram, and the volume is determined directly by measuring its diameter using an optical interferometer as discussed by the authors.
Journal ArticleDOI
Ophiolites as faithful records of the oxygen isotope ratio of ancient seawater: The Solund-Stavfjord Ophiolite Complex as a Late Ordovician example
TL;DR: In this paper, the authors used fragments of the Ordovician sea floor preserved in the Solund-Stavfjord Ophiolite Complex in Western Norway as proxies for the δ18O of seawater.
Journal ArticleDOI
Oxygen and carbon stable isotope tracers of the water masses in the Central Brazil Basin
TL;DR: In this paper, stable isotope characteristics of the six water layers in the Central Brazil Basin are defined and compared to the various sources from which they originate, and the ∂18 O−S relationship allows us to discriminate between the more 18O-rich/more saline surface waters and South Atlantic Central Water formed in the tropical sub-tropical zones, and low-18O/fresher water layers (Antarctic Intermediate Water: AAIW, Circumpolar Water: CPW, North Atlantic Deep Water: NADW, Antarctic Bottom Water: AABW
Journal ArticleDOI
Pollution vulnerability of the Quaternary aquifer near Cairo, Egypt, as indicated by isotopes and hydrochemistry
M. A. Sadek,S. G. Abd El-Samie +1 more
TL;DR: In this article, a study was conducted to delineate the pollution vulnerability of the Quaternary aquifer in two areas, Imbaba and Shobra El-Khima, near Cairo, Egypt.
References
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Journal ArticleDOI
Isotopic Variations in Meteoric Waters
TL;DR: The relationship between deuterium and oxygen-18 concentrations in natural meteoric waters from many parts of the world has been determined with a mass spectrometer and shows a linear correlation over the entire range for waters which have not undergone excessive evaporation.
Journal ArticleDOI
Isotopic standards for carbon and oxygen and correction factors for mass-spectrometric analysis of carbon dioxide
TL;DR: 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.
Journal ArticleDOI
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.
Journal ArticleDOI
Effect of Low Concentrations of Carbon Dioxide on Photosynthesis Rates of Two Races of Oxyria.
TL;DR: Alpine plants of Oxyria digyna have higher apparent photosynthesis rates at various carbon dioxide concentrations than arctic, sea-level plants of the same species, which may be involved in the survival of plants at high elevations.