Continuous flow high field nuclear magnetic resonance detector for liquid chromatographic analysis of fuel samples

Journal Article · Tue Dec 01 04:00:00 EST 1981 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00237a045· OSTI ID:5809227

Haw, J F; Glass, T E; Dorn, H C

The design and characterization of a continuous flow probe insert for a 200-MHz /sup 1/H nuclear magnetic resonance (NMR) detector for high-performance liquid chromatography (HPLC) are described. Modern superconducting magnet based systems present different requirements for flow probe design, but a considerable improvement over older spectrometers is readily achieved. Improvements in both spectroscopic and chromatographic resolution are shown to enhance the analytical utility of LC-/sup 1/H NMR. Spectral resolution is 2 Hz or 4 Hz with optimum sensitivity. Injection volumes of 10 to 25 ..mu..L provide detection limits of 10 ..mu..g. The LC-/sup 1/H NMR analyses of a model mixture and two experimental petroleum based fuel samples are presented. A LC-/sup 1/H NMR based method for calculating the average degree of substitution of aromatic ring systems is discussed in detail.

• Research Organization: Virginia Polytechnic Institute and State Univ., Blacksburg
• OSTI ID: 5809227
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 53:14; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104 -- Spectral Procedures-- (-1987)
400105* -- Separation Procedures
CHEMICAL ANALYSIS
CHROMATOGRAPHY
DATA
DESIGN
EXPERIMENTAL DATA
FUELS
INFORMATION
JET ENGINE FUELS
LIQUID COLUMN CHROMATOGRAPHY
MAGNETS
MEASURING INSTRUMENTS
NMR SPECTRA
NUMERICAL DATA
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
SPECTRA
SPECTROMETERS