isotope ratio mass spectrometry

A high-accuracy, high-precision form of mass spectrometry used to determine ratios of atomic isotopes in small volumes of gas, which are used in geochemistry, cosmological chemistry, (carbon) dating and tracer studies

References in periodicals archive ?

GIRMS, gas isotope ratio mass spectrometry, IRMS, infrared mass spectrophotometry.

Urea breath testing and analysis in the primary care office. (Brief Report)

Confirming testosterone administration by isotope ratio mass spectrometry analysis of urinary androstanediols.

[[sup.13]C]nandrolone excretion in trained athletes: interindividual variability in metabolism

Isotope ratio mass spectrometry is a specialized magnetic sector mass spectrometry technique designed to measure isotopes.

Market Profile: Isotope Ratio MS

The most suitable methods for such studies are isotope-dilution mass spectrometry methods, including gas chromatography-mass spectrometry (GC/MS) [3] and isotope ratio mass spectrometry coupled with a combustion chamber furnace and GC (GC/C/IRMS) (4).

Improved method for gas chromatographic--mass spectrometric analysis of 1-[sup.13]C-labeled long-chain fatty acids in plasma samples

Androstanediol and 5-androstenediol profiling for detecting exogenously administered dihydrotestosterone, epitestosterone, and dehydroepiandrosterone: potential use in gas chromatography isotope ratio mass spectrometry. Steroids 1997;62:665-73.

Detection of epitestosterone doping by isotope ratio mass spectrometry

However, the use of gas isotope ratio mass spectrometry to measure [sup.2][H.sub.2]O is expensive, requires specialist knowledge for operation and maintenance, and is somewhat tedious because the water is first transformed to hydrogen (3, 4) or equilibrated with hydrogen (5, 6).