Results 251 to 260 of about 154,472 (297)

High-precision continuous-flow isotope ratio mass spectrometry

Mass Spectrometry Reviews, 1997
Although high-precision isotope determinations are routine in many areas of natural science, the instrument principles for their measurements have remained remarkably unchanged for four decades. The introduction of continuous-flow techniques to isotope ratio mass spectrometry (IRMS) instrumentation has precipitated a rapid expansion in capabilities for
J T, Brenna, T N, Corso, H J, Tobias, R J, Caimi   +3 more
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Gas Source Isotope Ratio Mass Spectrometry (IRMS)

2014
Gas source isotope ratio mass spectrometry is usually referred to as isotope ratio mass spectrometry (IRMS) or stable-isotope ratio mass spectrometry (SIRMS). IRMS is a conventional method for measuring isotope ratios and has benefited from more than 65 years of research and development.
Brand, W., Douthitt, C., Fourel, F., Maia, R., Rodrigues, C., Maguas, C., Prohaska, T.   +6 more
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Comparison of gas chromatography/isotope ratio mass spectrometry and liquid chromatography/isotope ratio mass spectrometry for carbon stable‐isotope analysis of carbohydrates

Rapid Communications in Mass Spectrometry, 2015
Rationale We compared gas chromatography/isotope ratio mass spectrometry (GC/IRMS) and liquid chromatography/isotope ratio mass spectrometry (LC/IRMS) for the measurement of δ 13 C values in carbohydrates.
Moerdijk-Poortvliet, Tanja C. W., Schierbeek, Henk, Houtekamer, Marco, van Engeland, Tom, Derrien, Delphine, Stal, Lucas J., Boschker, Henricus T. S.   +6 more
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Desulfurization of black powder for isotopic profiling using isotope ratio mass spectrometry

Forensic Science International, 2022
The stable isotope analysis of black powder is of utmost significance with regard to its further comparison and traceability in explosion-related cases. To date, only a limited number of studies have reported the stable isotope analysis of black powder using isotope ratio mass spectrometry (IRMS).
Yang, Huang, Jun, Zhu, Can, Hu, Hongcheng, Mei, Ziyang, Yu, Hao, Qin   +5 more
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Isotope-ratio-monitoring gas chromatography-mass spectrometry: methods for isotopic calibration

Organic Geochemistry, 1994
In trial analyses of a series of n-alkanes, precise determinations of 13C contents were based on isotopic standards introduced by five different techniques and results were compared. Specifically, organic-compound standards were coinjected with the analytes and carried through chromatography and combustion with them; or CO2 was supplied from a ...
D A, Merritt, W A, Brand, J M, Hayes
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Isotope Ratio Measurements with Elemental-Mode Electrospray Mass Spectrometry

Analytical Chemistry, 1996
The isotope ratio capabilities of an electrospray ionization source interfaced to a quadrupole mass spectrometer are described. With the instrument operated in the metal ion mode, isotope measurements of Ag, Tl, and Pb are conducted using elemental ions produced from 1 × 10(-)(4) M solutions of metal nitrates or acetates in methanol.
M E, Ketterer, J P, Guzowski
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High-precision liquid chromatography-combustion isotope ratio mass spectrometry

Analytical Chemistry, 1993
Online liquid chromatography-combustion high-precision carbon isotope ratio mass spectrometry (LCC-IRMS) is demonstrated for the first time with a direct interface to the liquid source. The interface is based on a continuously coated moving wire which facilitates reproducible solvent removal and analyte combustion, followed by drying of the CO2 and ...
R J, Caimi, J T, Brenna
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Forensic applications of isotope ratio mass spectrometry—A review

Forensic Science International, 2006
The key role of a forensic scientist is to assist in determining whether a crime has been committed, and if so, assist in the identification of the offender. Many people hold the belief that a particular item can be conclusively linked to a specific person, place or object. Unfortunately, this is often not achievable in forensic science.
Sarah, Benson, Chris, Lennard, Philip, Maynard, Claude, Roux   +3 more
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Carbon Isotope Ratio Analysis of Steroids by High-Temperature Liquid Chromatography-Isotope Ratio Mass Spectrometry

Analytical Chemistry, 2014
Generally, compound-specific isotope analysis of steroids is carried out by gas chromatography combined with isotope ratio mass spectrometry. Thus, a derivatization of the steroids prior to the measurement is compulsory, and a correction of the isotopic data is often necessary.
Zhang, Lijun, Thevis, Mario, Piper, Thomas, Jochmann, Maik, Wolbert, Jens-Benjamin, Kujawinski, Dorothea M., Wiese, Steffen, Teutenberg, Thorsten, Schmidt, Torsten Claus   +8 more
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Stable carbon isotope analysis of amino acid enantiomers by conventional isotope ratio mass spectrometry and combined gas chromatography/isotope ratio mass spectrometry

Analytical Chemistry, 1991
The application of a combined gas chromatography/isotope ratio mass spectrometry (GC/IRMS) method for stable carbon isotope analysis of amino acid enantiomers is presented. Amino acids require derivatization prior to GC/IRMS analysis. Derivatization of amino acid standards of known stable carbon isotope compositions in conjunction with natural samples,
J. A. Silfer, M. H. Engel, S. A. Macko, E. J. Jumeau   +3 more
openaire   +1 more source