Journal ArticleDOI
High-Precision Laser Spectroscopy D/H and 18O/16O Measurements of Microliter Natural Water Samples
Reads0
Chats0
TLDR
A detailed assessment of the performance of a liquid-water isotope analyzer is presented, including instrument precision, estimates of sample memory and sample mass effects, and instrumental drift, and a recommended analysis procedure to achieve optimum results using OA-ICOS.Abstract:
Newly available gas analyzers based on off-axis integrated cavity output spectroscopy (OA-ICOS) lasers have been advocated as an alternative to conventional isotope-ratio mass spectrometers (IRMS) for the stable isotopic analysis of water samples In the case of H2O, OA-ICOS is attractive because it has comparatively low capital and maintenance costs, the instrument is small and field laboratory portable, and provides simultaneous D/H and 16O/18O ratio measurements directly on H2O molecules with no conversion of H2O to H2, CO, or H2/CO2−water equilibration required Here we present a detailed assessment of the performance of a liquid-water isotope analyzer, including instrument precision, estimates of sample memory and sample mass effects, and instrumental drift We provide a recommended analysis procedure to achieve optimum results using OA-ICOS Our results show that, by using a systematic sample analysis and data normalization procedure routine, measurement accuracies of ± 08‰ for δD and ±01‰ δ18O arread more
Citations
More filters
Journal ArticleDOI
Isotopic ecology ten years after a call for more laboratory experiments.
TL;DR: In this article, the authors identified four major areas of inquiry: (1) the dynamics of isotopic incorporation, (2) mixing models, (3) routing, and (4) trophic discrimination factors.
Isotopic ecology ten years after a call for more laboratory experiments. Biol Rev
Carlos MartÃnez del Rio,Carlos Martínez del Rio,Nathan Wolf,Scott A. Carleton,Leonard Z. Gannes +4 more
TL;DR: These areas remain central to isotopic ecology and are used as organising foci to review the experimental results that isotopic ecologists have collected and the models that have been built to explain and organise experimental results in these areas.
Journal ArticleDOI
Demonstration of high-precision continuous measurements of water vapor isotopologues in laboratory and remote field deployments using wavelength-scanned cavity ring-down spectroscopy (WS-CRDS) technology
Priya Gupta,David Noone,David Noone,Joseph Galewsky,Colm Sweeney,Colm Sweeney,Bruce H. Vaughn +6 more
TL;DR: The results of these trials show that the isotopic water analyzer gives precise, accurate measurements with little or no instrument drift for the two most common isotopologues of water.
Journal ArticleDOI
Enhancing drought tolerance in C4 crops
Marta S. Lopes,José Luis Araus,José Luis Araus,Philippus D.R. van Heerden,Christine H. Foyer +4 more
TL;DR: Current evidence points to the crucial importance of root traits in drought tolerance in C(4) plants, shoot traits may also be important in maintaining high yields during drought, and the molecular mechanisms underpinning heterosis have considerable potential in enhancing drought stress tolerance.
References
More filters
Journal ArticleDOI
Sensitive absorption measurements in the near-infrared region using off-axis integrated-cavity-output spectroscopy
TL;DR: In this article, the authors used a high-finesse optical cavity as an absorption cell for gas mixing ratios using near-infrared diode lasers and absorption-spectroscopy techniques.
Journal ArticleDOI
A rapid method for determination of hydrogen and oxygen isotope ratios from water and hydrous minerals
TL;DR: In this article, a general-purpose, on-line, continuous flow method for determination of δ D and δ 18 O values of water and hydrous minerals is described, which involves reduction of H 2 O or solid hydrous samples by reaction with glassy carbon at high temperatures.
Journal ArticleDOI
Tunable diode laser absorption spectroscopy for stable isotope studies of ecosystem–atmosphere CO2 exchange
TL;DR: In this article, a tunable diode laser absorption spectrometer (TDL) was used for measuring the carbon isotope content of CO2 at atmospheric mole fractions and isotopic abundance.
Journal ArticleDOI
On-Line High-Precision Stable Hydrogen Isotopic Analyses on Nanoliter Water Samples
TL;DR: A new on-line chromium reduction technique for the measurement of stable hydrogen (deltaD) isotopes in waters using continuous-flow isotope ratio mass spectrometry that has low intersample memory effects and excellent precision and accuracy for deltaD was used to analyze waters samples as small as 50 nL.
Journal ArticleDOI
Continuous flow 2H/1H and 18O/16O analysis of water samples with dual inlet precision
TL;DR: An on-line high-temperature reduction technique in a helium carrier gas has the capability to transfer high-precision stable isotope ratio analysis of water samples from a specialized to a routine laboratory task compatible with other common techniques.