isotope ratio
Improved Method for Differentiation of Synthetic and Natural Endogenous Anabolic Steroids using Gas Chromatography Isotope Ratio Mass Spectrometry (GC/C/IRMS) followed by Two-Fold High Performance Liquid Chromatography (HPLC) Cleanup Method: A Perspective
... chromatography-combustion/isotope ratio mass spectrometry (GC/C/IRMS) technique differentiates between natural and synthetic endogenous steroids by comparing compounds specific 13 C/ 12 C ...
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Novel laser spectroscopic technique for continuous analysis of N2O isotopomers - application and intercomparison with isotope ratio mass spectrometry
... well as m/z 30, 31 of NO + fragment ions. [19] A modified preconcentration unit consisting of a set of automated cryo- traps (PreCon; ThermoFinnigan, Bremen, Germany) equipped with an autosampler (Combi-PAL; ...
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On the interference of Kr during carbon isotope analysis of methane using continuous-flow combustion–isotope ratio mass spectrometry
... Fig. 1. Simplified flow scheme used for δ 13 C analysis of CH 4 on air samples applying the continuous-flow IRMS technique. The scheme provides an overview of basic components and specific add-ons of the systems used in ...
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Method for determination of stable carbon isotope ratio of methylnitrophenols in atmospheric particulate matter
... of isotope ratio mea- surements for studies of atmospheric SOA formation is the lack of tested and proven measurement ...to isotope ratio mass spec- trometry (GC-IRMS) allows compound specific ...
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A Simple and Fast Separation Method of Fe Employing Extraction Resin for Isotope Ratio Determination by Multicollector ICP MS
... Fe isotope ratios were measured by a double-spike method employing multicollector inductively coupled plasma source mass spectrometry (MC-ICP-MS) with repeatability of ...Fe isotope ratio measurement ...
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The stability and calibration of water vapor isotope ratio measurements during long-term deployments
... et al., 2014; Steen-Larsen et al., 2014b) dew point genera- tors. These produce a range of water vapor volume mixing ratios but are sensitive to isotopic fractionation as the liq- uid progressively evaporates from the ...
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Large-volume air sample system for measuring 34S∕32S isotope ratio of carbonyl sulfide
... using isotope analysis, determination of isotopic fractionation for reactions and ambient measurements is re- ...sulfur isotope ratios (δ 33 S, δ 34 S, and 1 33 S values) of OCS in our labo- ratory, an ...
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An analytical system for stable isotope analysis on carbon monoxide using continuous-flow isotope-ratio mass spectrometry
... Figure 1. A diagram of the continuous-flow isotope-ratio mass spectrometry system for measuring 13 C and 18 O of CO. S 1 to S 8 represent the sample flasks; the connections to the flask can be changed to ...
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The stable oxygen isotope ratio of resin extractable phosphate derived from fresh cattle faeces
... Stable isotope ratios have been used to track elements during transfers between different pools and to understand the respective roles of abiotic and biotic processes during these ...stable isotope and ...
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A method for stable carbon isotope ratio and concentration measurements of ambient aromatic hydrocarbons
... carbon isotope ratios and concentration of ambient volatile organic compounds (VOCs) is ...and isotope ratio analysis by iso- tope ratio mass ...carbon isotope ratios of ambient ...
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Assessment of the authenticity of fruit spirits by gas chromatography and stable isotope ratio analyses
... by isotope ratio mass spectrometry – IRMS analysis as well as SNIF–NMR analysis of (D/H)I and (D/H)II ratios in ethanol are prospective analytical methods which can be used for checking the authenticity of ...
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Characterization of the Geographical and Varietal Origin of Wheat and Bread by Means of Nuclear Magnetic Resonance (NMR), Isotope Ratio Mass Spectrometry (IRMS) Methods and Chemometrics: A Review
... Another suitable method for the authentication of food products is the Isotope Ratio Mass Spectrometry (IRMS). This technique has shown to provide interesting information on the origin of food products, ...
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Continuous-flow isotope ratio mass spectrometry method for carbon and hydrogen isotope measurements on atmospheric methane
... Fig. 1. Scheme of the online methane analysis system: methane from the sample air stored in the sample loop is isolated from other air components by subsequent preconcentration, cryofocussing and gas chromatographic ...
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Ice-shelf – ocean interactions at Fimbul Ice Shelf, Antarctica from oxygen isotope ratio measurements
... oxygen isotope ratio measure- ments made on the continental shelf in front of Fimbul Ice ...the ratio, whereas evapora- tion and precipitation have a large ...
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Evaluation of Pollution Sources of Zinc in Tokyo Bay Based on Zinc Isotope Ratio in Sediment Core
... 0.001) between the concentrations of Zn and Al in the three rivers. Hence, it is likely that the Zn concentration in the rivers increases with increasing amount of lithogenic particles. This suggests that Zn is ...
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The stable oxygen isotope ratio of resin extractable phosphate derived from fresh cattle faeces
... the opposite side of the glass U-tube in liquid nitrogen, forcing evaporating sample water to condense and collect. This set up was maintained for at least 1 hour to ensure complete water transfer. Sample water was ...
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Evaluating calibration strategies for isotope ratio infrared spectroscopy for atmospheric 13 CO 212 CO 2measurement
... ing the IRIS measurements, but few studies have systemati- cally evaluated their accuracy for atmospheric applications. In this study, we carried out laboratory and ambient measure- ments with two commercial IRIS ...
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East Asian Monsoon controls on the inter-annual variability in precipitation isotope ratio in Japan
... a conventional cold trap method, which was used in Ku- rita (2013). Outdoor air (15 m above the ground) was drawn to the WVIA and the cold trap system with a 5 m length of Teflon tubing via the external pump at a flow ...
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Recent advances in the application of stable isotope ratio analysis in forensic chemistry
... determine if it was possible to link the starting material used in the synthesis of RDX to the prepared product using carbon and nitrogen isotope analysis. They selected five hexamine samples as the starting ...
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High precision isotope ratio measurements of uranium and plutonium in the environment
... introduced at the top of the stratosphere would have a longer residence time than would plutonium from weapons testing which was mainly introduced to the lower parts. Besides the location of injected particles, other ...
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