Results 281 to 290 of about 157,168 (328)
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Isotope Ratio Measurements with Elemental-Mode Electrospray Mass Spectrometry
Analytical Chemistry, 1996The 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, 1993Online 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, 2006The 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 +3 more
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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 +8 more
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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 +8 more
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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. +6 more
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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. +6 more
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Isotope ratio measurements using glow discharge mass spectrometry
International Journal of Mass Spectrometry and Ion Processes, 1995Abstract Glow discharge mass spectrometry (GDMS) has been evaluated for its ability to measure isotope ratios in solids. Isotope ratios were measured for B, Cu, Sr, Ag, Sb, Re and Pb in concentrations ranging from 15 ppm to pure metal. External precision of better than 0.03% has been achieved for isotope ratios measured using pure solid elemental ...
Lee R. Riciputi +3 more
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Isotope ratio mass spectrometry in forensic science applications
Forensic Chemistry, 2019Abstract This review highlights advances in the application of isotope ratio mass spectrometry (IRMS) to materials of interest to the forensic community. We give special attention to the natural abundance differences in the stable isotopes of carbon, nitrogen, hydrogen and oxygen because they are the most abundant and informative elements in typical ...
Mayara P.V. Matos, Glen P. Jackson
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Applied gas chromatography coupled to isotope ratio mass spectrometry
Journal of Chromatography A, 1999Compound-specific isotope analysis (CSIA) by isotope ratio mass spectrometry (IRMS) following on-line combustion (C) of compounds separated by gas chromatography (GC) is a relatively young analytical method. Due to its ability to measure isotope distribution at natural abundance level with great accuracy and high precision, GC-C-IRMS has increasingly ...
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High Precision Isotope Ratio Monitoring Techniques in Mass Spectrometry
Journal of Mass Spectrometry, 1996Isotope ratio monitoring following on-line combustion is a new method in gas chromatography/mass spectrometry (GC/MS) that allows the ratios of abundances of stable isotopes of elements such as carbon and nitrogen to be determined for individual compounds introduced via a gas chromatograph.
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Rapid Communications in Mass Spectrometry, 2009
Abstract Gaseous membrane permeation (MP) technologies have been combined with continuous‐flow isotope ratio mass spectrometry for on‐line δ 13 C measurements.
Patrice, Tremblay +3 more
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Abstract Gaseous membrane permeation (MP) technologies have been combined with continuous‐flow isotope ratio mass spectrometry for on‐line δ 13 C measurements.
Patrice, Tremblay +3 more
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