Isotope-ratio-monitoring gas chromatography--mass spectrometry
A 750/sup 0/C cupric-oxide-packed combustion furnace is inserted between the gas chromatographic column outlet and a GC/MS interface attached to a computer-controlled beam-switching isotope ratio mass spectrometer. Monitoring of N/sub 2/ and CO/sub 2/ ion currents due to the combustion products allows continuous measurement of /sup 15/N//sup 14/N or /sup 13/C//sup 12/C ratios, providing directly comparable isotopic analyses for all eluting compounds regardless of composition and mass spectrometric behavior of the parent compounds. Carbon and nitrogen isotope ratios can be measured with a precision of 0.5% or better with 20 nmol of CO/sub 2/ or 100 nmol of N/sub 2/. Enrichments of /sup 13/C and /sup 15/N as low as 0.004 at.% excess can be detected. 5 figures, 3 tables.
- Research Organization:
- Indiana Univ., Bloomington
- OSTI ID:
- 6782036
- Journal Information:
- Anal. Chem.; (United States), Vol. 50:11
- Country of Publication:
- United States
- Language:
- English
Similar Records
Carbon isotopic analysis of atmospheric methane by isotope-ratio-monitoring gas chromatography-mass spectrometry
Isotope ratio mass spectrometry in nutrition research
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMINO ACIDS
COMBUSTION
CARBON 12
ISOTOPE RATIO
CARBON 13
CARBOXYLIC ACID ESTERS
COMBUSTION PRODUCTS
NITROGEN
QUANTITATIVE CHEMICAL ANALYSIS
NITROGEN 15
COMPUTERS
COPPER OXIDES
CURRENTS
DESIGN
EQUIPMENT
FURNACES
GAS CHROMATOGRAPHY
HIGH TEMPERATURE
MASS SPECTRA
MONITORING
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE
CARBON ISOTOPES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHROMATOGRAPHY
COPPER COMPOUNDS
CRYOGENIC FLUIDS
ELEMENTS
ESTERS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUIDS
ISOTOPES
LIGHT NUCLEI
NITROGEN ISOTOPES
NONMETALS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SPECTRA
STABLE ISOTOPES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
400104* - Spectral Procedures- (-1987)
400105 - Separation Procedures