Determination of carboxylic acids by isotope dilution gas chromatography/Fourier transform infrared spectroscopy
A method has been developed for determining carboxylic acids by isotope dilution with /sup 18/O-enriched carboxylic acids and measurement of the isotope ratio in methyl esters of the analyte and standard mixture by capillary gas chromatography/Fourier transform infrared (GC/FTIR) spectroscopy. The difference in the carbonyl absorption maxima for the analyte and standard esters allowed separate absorbance chromatograms to be reconstructed by integration over two narrow frequency ranges in each analyte/standard GC/FTIR spectrum. Area ratios obtained from the absorbance reconstructed chromatograms were plotted versus concentration ratios to give a nonlinear calibration plot, which was expressed as a third-order polynomial by least-squares polynomial fitting. The method was more accurate than GC/MS method developed with the same standards, analytes, and range of concentrations. The isotope dilution GC/FTIR method was applied to the quantitative analysis of aqueous mixtures of coal oxidation products.
- Research Organization:
- Univ. of North Dakota Energy and Mineral Research Center, Grand Forks (USA)
- DOE Contract Number:
- FC21-86MC10637
- OSTI ID:
- 6743320
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 60:18; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400102* -- Chemical & Spectral Procedures
ABSORPTION SPECTROSCOPY
CARBOXYLIC ACIDS
CHEMICAL ANALYSIS
CHROMATOGRAPHY
DATA
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FOURIER TRANSFORM SPECTROMETERS
GAS CHROMATOGRAPHY
INFORMATION
INFRARED SPECTRA
ISOTOPE APPLICATIONS
ISOTOPE DILUTION
ISOTOPE ENRICHED MATERIALS
ISOTOPE RATIO
ISOTOPES
LIGHT NUCLEI
MATERIALS
MEASURING INSTRUMENTS
NUCLEI
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN 18
OXYGEN ISOTOPES
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
SPECTRA
SPECTROMETERS
SPECTROSCOPY
STABLE ISOTOPES
TRACER TECHNIQUES