Position-specific 15 N isotope analysis in organic molecules: A high-precision 15 N NMR method to determine the intramolecular 15 N isotope composition and fractionation at natural abundance

2019 ◽  
Vol 57 (12) ◽  
pp. 1136-1142 ◽  
Author(s):  
Valentin Joubert ◽  
Virginie Silvestre ◽  
Maxime Lelièvre ◽  
Virginie Ladroue ◽  
Fabrice Besacier ◽  
...  
Keyword(s):  
High Precision ◽  
Organic Molecules ◽  
Isotope Composition ◽  
Isotope Analysis ◽  
Natural Abundance ◽  
Nmr Method

The Organic Isotopologue Frontier

2021 ◽  
Vol 49 (1) ◽  
Author(s):  
Alexis Gilbert
Keyword(s):  
Organic Molecules ◽  
Technological Development ◽  
Isotope Composition ◽  
Measurement Techniques ◽  
Isotope Analysis ◽  
Annual Review ◽  
Publication Date ◽  
Stable Isotope Composition ◽  
New Information ◽  
Technological Developments

Organic molecules are key components of the Earth-life system. Their stable isotope composition provides information on various problems such as past climate, energy resources, or the synthesis of prebiotically relevant molecules on Earth and elsewhere. Organic molecules are made of isotopologues, molecules differing in the number and/or position of isotope substitution. Recent years have witnessed a boom in technological development dedicated to isotopologue measurement, leading to an unprecedented degree of information regarding organic (bio)synthesis. While applications in Earth and planetary sciences has been limited so far to simple hydrocarbons, typically methane, isotopologue proxies are expected to rapidly emerge in biogeochemistry, providing new types of environmental and biological tracers. This review describes principles and measurement techniques, as well as present and potential biogeochemical applications. ▪ Stable isotopes of organic molecules are widely used in biogeo-chemistry. ▪ Isotope analysis at the intramolecular level is expected to provide new information on the origin of molecules. ▪ Recent technological developments unlocked the potential of intramolecular isotope analysis, providing new proxies in biogeochemistry and new opportunities to clarify questions related to Earth and planetary sciences. Expected final online publication date for the Annual Review of Earth and Planetary Sciences, Volume 49 is May 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

Stable oxygen isotope composition of plant tissue: a review

2007 ◽  
Vol 34 (2) ◽  
pp. 83 ◽  
Author(s):  
Margaret M. Barbour
Keyword(s):  
Oxygen Isotope ◽  
Plant Tissue ◽  
Organic Molecules ◽  
Isotope Composition ◽  
Measurement Techniques ◽  
Isotope Analysis ◽  
Theoretical Models ◽  
Oxygen Isotope Composition ◽  
Stable Oxygen Isotope ◽  
Stable Oxygen

With the development of rapid measurement techniques, stable oxygen isotope analysis of plant tissue is poised to become an important tool in plant physiological, ecological, paleoclimatic and forensic studies. Recent advances in mechanistic understanding have led to the improvement of process-based models that accurately predict variability in the oxygen isotope composition of plant organic material (δ18Op). δ18Op has been shown to reflect the isotope composition of soil water, evaporative enrichment in transpiring leaves, and isotopic exchange between oxygen atoms in organic molecules and local water in the cells in which organic molecules are formed. This review presents current theoretical models describing the influences on δ18Op, using recently published experimental work to outline strengths and weaknesses in the models. The potential and realised applications of the technique are described.

High-precision molybdenum isotope analysis of low-Mo igneous rock samples by MC–ICP–MS

2020 ◽  
Vol 545 ◽  
pp. 119648 ◽  
Author(s):  
Jing-Jing Fan ◽  
Jie Li ◽  
Qiang Wang ◽  
Le Zhang ◽  
Jing Zhang ◽  
...  
Keyword(s):  
High Precision ◽  
Igneous Rock ◽  
Isotope Analysis ◽  
Molybdenum Isotope ◽  
Rock Samples ◽  
Icp Ms

scholarly journals Sunda arc mantle source δ18O value revealed by intracrystal isotope analysis

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Frances M. Deegan ◽  
Martin J. Whitehouse ◽  
Valentin R. Troll ◽  
Harri Geiger ◽  
Heejin Jeon ◽  
...  
Keyword(s):  
Mantle Source ◽  
Secondary Ion Mass Spectrometry ◽  
Isotope Composition ◽  
Isotope Analysis ◽  
Sunda Arc ◽  
Mid Ocean Ridge ◽  
Plumbing Systems ◽  
Ocean Ridge ◽  
Secondary Ion ◽  
Magma Plumbing

AbstractMagma plumbing systems underlying subduction zone volcanoes extend from the mantle through the overlying crust and facilitate protracted fractional crystallisation, assimilation, and mixing, which frequently obscures a clear view of mantle source compositions. In order to see through this crustal noise, we present intracrystal Secondary Ion Mass Spectrometry (SIMS) δ18O values in clinopyroxene from Merapi, Kelut, Batur, and Agung volcanoes in the Sunda arc, Indonesia, under which the thickness of the crust decreases from ca. 30 km at Merapi to ≤20 km at Agung. Here we show that mean clinopyroxene δ18O values decrease concomitantly with crustal thickness and that lavas from Agung possess mantle-like He-Sr-Nd-Pb isotope ratios and clinopyroxene mean equilibrium melt δ18O values of 5.7 ‰ (±0.2 1 SD) indistinguishable from the δ18O range for Mid Ocean Ridge Basalt (MORB). The oxygen isotope composition of the mantle underlying the East Sunda Arc is therefore largely unaffected by subduction-driven metasomatism and may thus represent a sediment-poor arc end-member.

Factors affecting 13C/12C ratios of inland halophytes. I. Controlled studies on growth and isotopic composition of Puccinellia nuttalliana

1986 ◽  
Vol 64 (11) ◽  
pp. 2693-2699 ◽  
Author(s):  
Robert D. Guy ◽  
David M. Reid ◽  
H. Roy Krouse
Keyword(s):  
Isotope Composition ◽  
Stable Carbon Isotope ◽  
Isotope Analysis ◽  
Research Problem ◽  
Carbon Isotope Composition ◽  
Stable Carbon ◽  
Factors Affecting ◽  
Plant Parts ◽  
High Level ◽  
Puccinellia Nuttalliana

Studies on various factors affecting the growth and stable carbon isotope composition of the graminaceous C3 halophyte Puccinellia nuttalliana (Schultes) Hitch. were initiated as a step towards interpreting δ13C variations in nature. For isotope analysis, combustion at 900 °C resulted in higher CO2 yield than at 550 °C but did not affect δ13C values. Differences in δ13C between leaves of different insertion level were unimportant, but roots were about 1‰ more positive than shoots. Trends in δ13C with salinity were the same in all plant parts. Depressions of growth by NaCl or Na2SO4 were similar, but plants grown in Na2SO4 displayed a greater shift in δ13C relative to controls. Growth rates were affected more by salinity than were previously reported photosynthetic rates. At typical salinities, δ13C changed linearly with salinity. The supply of nitrate to stressed and unstressed plants had no important influence on δ13C. Growth in polyethylene glycol produced δ13C values consistent with a high level of stress. After a salinity step-up, changes in δ13C were complete within 10 days. During winter, data were found to be heavily influenced by unintentional, human-respired CO2 enrichment. This represents a potentially serious research problem in laboratories of temperate climes.

scholarly journals High-precision Pb and Ag isotope analysis of galenas from Spain: new insights into silver ore exploitation in Roman times

2021 ◽  
Author(s):  
Jean Milot ◽  
Janne Blichert-Toft ◽  
Chloé Malod-Dognin ◽  
Philippe Telouk ◽  
Mariano Ayarzagüena Sanz ◽  
...  
Keyword(s):  
High Precision ◽  
Isotope Analysis

scholarly journals Development of high-precision La isotope analysis by MC-ICP-MS

2021 ◽  
Author(s):  
Mitsuru Suzuki ◽  
Tsuyoshi Iizuka ◽  
Kota Yamamoto ◽  
Takafumi Hirata
Keyword(s):  
High Precision ◽  
Isotope Analysis ◽  
Icp Ms
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