scholarly journals Development and airborne operation of a compact water isotope ratio infrared spectrometer†

2009 ◽  
Vol 45 (4) ◽  
pp. 303-320 ◽  
Author(s):  
Rosario Q. Iannone ◽  
Samir Kassi ◽  
Hans-Jürg Jost ◽  
Marc Chenevier ◽  
Daniele Romanini ◽  
...  
Keyword(s):  
Isotope Ratio ◽  
Infrared Spectrometer ◽  
Water Isotope

scholarly journals Fast Sampling Field Deployable Mud Gas Carbon Isotope Analyzer

Geosciences ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 350
Author(s):  
Sheng Wu ◽  
Andrei Deev ◽  
Yan Zhuang ◽  
Le Lu ◽  
Zhengyou Wang ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Isotope Ratio ◽  
Gas Analysis ◽  
Gas Chromatograph ◽  
Hollow Waveguide ◽  
Mid Infrared ◽  
Temperature Changes ◽  
Quantum Cascade ◽  
Field Temperature ◽  
Infrared Spectrometer

We report the details of a field deployable mud gas carbon isotope analyzer for mud gas analysis based on coupling a gas chromatograph with a mid-infrared spectrometer using a quantum cascade laser and hollow waveguide. The GC–IR2 (gas chromatograph–infrared isotope ratio) system features a fast sampling cycle as short as 123 s for analyzing all three components, i.e., methane, ethane and propane. The samples are automatically diluted so the system could carry out effective measurements while sample concentrations vary from 400 ppm to 100% purity. The accuracy is guaranteed through periodic reference calibration, and variations due to field temperature changes are minimized.

scholarly journals Tree xylem water isotope analysis by Isotope Ratio Mass Spectrometry and laser spectrometry: A dataset to explore tree response to drought

Data in Brief ◽  
2020 ◽  
Vol 29 ◽  
pp. 105349
Author(s):  
Simon Damien Carrière ◽  
Nicolas K. Martin-StPaul ◽  
Coffi Belmys Cakpo ◽  
Nicolas Patris ◽  
Marina Gillon ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Isotope Ratio ◽  
Isotope Analysis ◽  
Isotope Ratio Mass Spectrometry ◽  
Laser Spectrometry ◽  
Water Isotope

Water isotope and chemical records in a recent snow pit from Hercules Neve, northern Victoria Land, Antarctica

2020 ◽  
Author(s):  
Songyi Kim ◽  
Yeongcheol Han ◽  
Soon Do Hur ◽  
HeeJin Hwang ◽  
Changhee Han ◽  
...  
Keyword(s):  
Isotope Ratio ◽  
Major Ions ◽  
Weather Condition ◽  
Sea Salt ◽  
Atmospheric Composition ◽  
Stable Isotope Ratios ◽  
Victoria Land ◽  
Water Stable Isotope ◽  
Ree Patterns ◽  
Water Isotope

<p>A snow pit samples contain information of atmospheric composition and weather condition for recent years. In this study, water isotope ratio and concentrations of major ions and rare earth elements (REE) were determined from a 2 m snow pit sampled at 5 cm intervals at Hercules Neve in northern Victoria Land, Antarctica (73° 03'S, 165° 25'E, 2900m). The water stable isotope ratios range from -45.10 to -29.51 ‰ for δ18O and from 355.8 to -229.2 ‰ for δD. From their clear seasonality, the snow pit is expected to cover the period of 2012–2015. The REE patterns reveal that there exist at least two distinct sources of terrestrial aerosols; One that makes superior contribution when sea salt input is high is likely located closer than another. </p>

scholarly journals Simulation of the isotopic composition of stratospheric water vapour – Part 2: Investigation of HDO / H<sub>2</sub>O variations

2015 ◽  
Vol 15 (12) ◽  
pp. 7003-7015 ◽  
Author(s):  
R. Eichinger ◽  
P. Jöckel ◽  
S. Lossow
Keyword(s):  
Isotopic Composition ◽  
Water Vapour ◽  
Isotope Ratio ◽  
Hydrological Cycle ◽  
Isotope Composition ◽  
Tape Recorder ◽  
Boreal Summer ◽  
Chemical Fractionation ◽  
Stratospheric Water Vapour ◽  
Water Isotope

Abstract. Studying the isotopic composition of water vapour in the lower stratosphere can reveal the driving mechanisms of changes in the stratospheric water vapour budget and therefore help to explain the trends and variations of stratospheric water vapour during recent decades. We equipped a global chemistry climate model with a description of the water isotopologue HDO, comprising its physical and chemical fractionation effects throughout the hydrological cycle. We use this model to improve our understanding of the processes which determine the patterns in the stratospheric water isotope composition and in the water vapour budget itself. The link between the water vapour budget and its isotopic composition in the tropical stratosphere is presented through their correlation in a simulated 21-year time series. The two quantities depend on the same processes; however, they are influenced with different strengths. A sensitivity experiment shows that fractionation effects during the oxidation of methane have a damping effect on the stratospheric tape recorder signal in the water isotope ratio. Moreover, the chemically produced high water isotope ratios overshadow the tape recorder in the upper stratosphere. Investigating the origin of the boreal-summer signal of isotopically enriched water vapour reveals that in-mixing of old stratospheric air from the extratropics and the intrusion of tropospheric water vapour into the stratosphere complement each other in order to create the stratospheric isotope ratio tape recorder signal. For this, the effect of ice lofting in monsoon systems is shown to play a crucial role. Furthermore, we describe a possible pathway of isotopically enriched water vapour through the tropopause into the tropical stratosphere.

Seeking excellence: An evaluation of 235 international laboratories conducting water isotope analyses by isotope-ratio and laser-absorption spectrometry

2018 ◽  
Vol 32 (5) ◽  
pp. 393-406 ◽  
Author(s):  
L.I. Wassenaar ◽  
S. Terzer-Wassmuth ◽  
C. Douence ◽  
L. Araguas-Araguas ◽  
P.K. Aggarwal ◽  
...  
Keyword(s):  
Isotope Ratio ◽  
Absorption Spectrometry ◽  
Laser Absorption ◽  
Isotope Analyses ◽  
Water Isotope

The validity and reliability of a novel isotope ratio infrared spectrometer to quantify 13C enrichment of expired breath samples in exercise

2021 ◽  
Author(s):  
Shaun Sutehall ◽  
Borja Muniz-Pardos ◽  
Danijela Šmajgl ◽  
Magda Mandic ◽  
Cedric Jeglinski ◽  
...  
Keyword(s):  
Isotope Ratio ◽  
Intraclass Correlation ◽  
Isotope Ratio Mass Spectrometry ◽  
Systematic Bias ◽  
Validity And Reliability ◽  
Large Space ◽  
Infrared Spectrometer ◽  
Test Retest Reliability ◽  
Space Requirements ◽  
Level Of Agreement

Rationale. The traditional method to measure 13CO2 enrichment in breath involves isotope ratio mass spectrometry (IRMS) and has several limitations such as cost, extensive training and large space requirements. Here we present the validity and reliability data of an isotope ratio infrared spectrometer (IRIS) based method developed to combat these limitations. Methods. Eight healthy male runners performed 105 min of continuous running on a motorised treadmill while ingesting various carbohydrate beverages enriched with 13C and expired breath samples obtained every 15 min in triplicate. A total of 213 breath samples were analysed using both methods, while 212 samples were repeated using IRIS to determine test-retest reliability. Bland-Altman analysis was performed to determine systematic and proportional bias, and intraclass correlation coefficient (ICC) and coefficient of variation (CV) to assess level of agreement and magnitude of error. Results. The IRIS method demonstrated a small but significant systematic bias to overestimate δ13CO2 (0.18‰; p<0.05) compared with IRMS, without any proportional bias or heteroscedasticity and a small CV% (0.5%). There was a small systematic bias during the test-retest of the IRIS method (-0.07‰; p<0.05), no proportional bias, an excellent ICC (1.00) and small CV% (0.4%). Conclusions. The use of the Delta Ray IRIS to determine 13C enrichment in expired breath samples captured during exercise has excellent validity and reliability when compared with the gold standard IRMS.

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