isotope measurements
Continuous-flow isotope ratio mass spectrometry method for carbon and hydrogen isotope measurements on atmospheric methane
... Isotope measurements are carried out using a ThermoFinni- gan MAT Delta plus XL isotope ratio mass ...the isotope composition of the sample peak is compared to a MS running gas that is ...
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Maintaining consistent traceability in high-precision isotope measurements of CO 2: a way to verify atmospheric trends of13C and 18O
... 1987; Coplen et al., 2006a). However, NBS19 only defines one point on the primary scale. It is almost impossible to accurately calibrate other secondary standards by this one point scale. If we use a ruler as an analogy ...
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Jena Reference Air Set (JRAS): a multi-point scale anchor for isotope measurements of CO 2in air
... square) linear regression represents the agreement between the round-robin measurements and the initial assignment re- sults on the JRAS-06 scale. The additive term in the equa- tion signifies an offset between ...
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Analytical system for stable carbon isotope measurements of low molecular weight (C 2-C6 ) hydrocarbons
... area measurements of each peak in the chromatogram, relative to peak areas from the working standard gas at accuracy levels of ± 10 % (see ...ISODAT isotope ra- tio analysis package, utilizing the ...
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Precise magnesium isotope measurements in core top planktic and benthic foraminifera
... Mg isotope ratios with a mean of d 26 Mg = ...Mg isotope ratios, despite changing environmental conditions which dominate Mg/Ca variation and arguably affect Ca isotope ...Mg isotope budget of ...
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Dual isotope measurements reveal zoning of nitrate processing in the summer Changjiang (Yangtze) River plume
... bial processes prior to assimilation. It counters the conventional thought that in surface river plumes, Figure 4. The scatter plots for (a) δ 18 O NO3 versus δ 15 N NO3 , (b) blow-up of the rectangle in Figure 4a, (c) δ ...
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The use of stable isotope measurements for monitoring and verification of CO2 storage
... Stable isotope ratios of carbon and oxygen expressed as G13C and G18O values can be easily determined for injected CO2 and carbon compounds in reservoir fluids and gases by a suitable ge[r] ...
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Fluoride sample matrices and reaction cells — new capabilities for isotope measurements in accelerator mass spectrometry
... decade, measurements made using inductively coupled plasma mass spectrometry (ICP-MS) have benefited from the use of chemical reac- tion cells [12] in which ions from the ICP source, usually following a stage of ...
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Using stable-hydrogen isotopes to reveal immigration in an Arctic-breeding songbird population
... hydrogen isotope measurements of the feathers of northern wheatears indicated a high rate of immigration into the breeding population, which is consistent with low return rates of banded breeding adults as ...
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On the use of Li isotopes as a proxy for water–rock interaction in fractured crystalline rocks: a case study from the Gotthard rail base tunnel
... Figure 1: Geological cross section through the Amsteg section of the Gotthard rail base tunnel. The two sections from which water and rock samples were taken for Li concentration and Li isotope measurements ...
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The influence of oxygen isotope exchange between CO2 and H2O in natural CO2-rich spring waters : implications for geothermometry
... R. Karolyt e acknowledges the support of an EPSRC PhD stu- _ dentship in partnership with Badley Geoscience Ltd. The authors acknowledge the funding provided by CO2CRC (036610/1). S. Serno was funded by the UK Carbon ...
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A synthetic standard for the analysis of carbon isotopes of carbon in silicates, and the observation of a significant water-associated matrix effect
... for isotope measurements via SIMS would yield a secondary carbon signal intensity within the same instrument dynamic range as that typically- found for microfossils in sedimentary rocks, exhibit minimal ...
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A method for stable carbon isotope ratio and concentration measurements of ambient aromatic hydrocarbons
... the isotope composition of VOCs in the atmo- sphere is challenging due to the high precision and accu- racy necessary to derive meaningful ...measured isotope ratios was close to ...carbon isotope ...
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Continuous measurements of atmospheric water vapour isotopes in western Siberia (Kourovka)
... high-frequency measurements of water vapour isotopic composition with an accuracy similar to that obtained by mass spectrometers (Gupta et ...laser-based isotope- ratio ...for measurements made at ...
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Insights from mercury stable isotopes on terrestrial–atmosphere exchange of Hg(0) in the Arctic tundra
... stable isotope measurements of Hg(0) in interstitial snow air and soil pore air to identify the processes driving tundra Hg(0) ...stable isotope signature mea- sured in the ...
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Chromium Isotopes Detection in their Ores with Minimal Errors
... to isotope measurements for this and other instrumental discriminations is dependent upon the detailed physical conditions existing in a particular mass spectrometer ...
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Sulfide Generation by Dominant Halanaerobium Microorganisms in Hydraulically Fractured Shales
... our measurements did reveal overall de- creases in thiosulfate concentrations over the sample collection period, coupled with the presence of persistent sulfide in produced ...Sulfur isotope ...
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Isotope production and target preparation for nuclear astrophysics data
... availability of the isotope and the extremely difficult handling due to the high specific activity. However, at PSI a method for filtering considerable amounts of 7 Be from the SINQ cooling water has been ...
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New Techniques for Noble Gas Geochronometry and Thermochronometry
... small samples (Crowther et al., 2008), and the ion trap, which has seen limited use in the measurement of noble gases prior to this work (Ramisetty, 2015). Experimental designs such as the Baur compressor ion source have ...
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A global transition to ferruginous conditions in the early Neoproterozoic oceans
... Hf isotope data from detrital zircons in the Neoproterozoic sandstones of northern Jiangsu and southern Liaoning Provinces, China: Implications for the Late Precambrian evolution of the southeastern North China ...
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