Results 201 to 210 of about 57,188 (237)

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
openaire   +2 more sources

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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Isotope ratio mass spectrometry – history and terminology in brief

Drug Testing and Analysis, 2012
The history of isotope ratio mass spectrometry (IRMS) is briefly described. It is shown that the fundamental design of isotope ratio mass spectrometers has not changed since the 1940s. The basic findings concerning the natural variation of isotope abundances even date back to the 1930s.
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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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Fast Gas Chromatography Combustion Isotope Ratio Mass Spectrometry

Analytical Chemistry, 2007
We report here the first coupling of fast GC to IRMS, in a system capable of 250 ms peak widths (fwhm) at 1 mL/min flow rates, one-fifth as narrow as any previously reported GCC-IRMS system. We developed an optimized postcolumn interface that results in minimal peak broadening, using a programmable temperature vaporization injector in place of a rotary
Gavin L, Sacks, Ying, Zhang, J Thomas, Brenna   +2 more
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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
openaire   +2 more sources

The Forensic Isotope Ratio Mass Spectrometry (FIRMS) network Good Practice Guide for Isotope Ratio Mass spectrometry 3rd edition

Science & Justice
The Forensic Isotope Ratio Mass Spectrometry (FIRMS) Network announce the publication of the Third Edition of the Good Practice Guide for Isotope Ratio Mass Spectrometry. In the third edition, changes include a new chapter on sampling covering method of sampling a population, sampling for homogeneity testing of a material as well as considerations for ...
Philip J.H. Dunn, Christopher Brodie, Ethan Strak, James F. Carter   +3 more
openaire   +3 more sources

Profiling of urinary formestane and confirmation by isotope ratio mass spectrometry

Steroids, 2013
Formestane (F, androst-4-en-4-ol-3,17-dione) is an irreversible aromatase inhibitor with the ability to suppress the estrogen production from anabolic steroids. Consequently, F is mentioned on the World Anti-Doping Agency (WADA) prohibited list and because studies have shown that F is produced endogenously in small amounts, a threshold for urinary ...
Michael, Polet, Pieter, Van Renterghem, Wim, Van Gansbeke, Peter, Van Eenoo   +3 more
openaire   +2 more sources

Acquisition and processing of data for isotope-ratio-monitoring mass spectrometry

Organic Geochemistry, 1994
Methods are described for continuous monitoring of signals required for precise analyses of 13C, 18O, and 15N in gas streams containing varying quantities of CO2 and N2. The quantitative resolution (i.e. maximum performance in the absence of random errors) of these methods is adequate for determination of isotope ratios with an uncertainty of one part
M P, Ricci, D A, Merritt, K H, Freeman, J M, Hayes   +3 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
openaire   +2 more sources