IP 392: Determination of aromatic hydrogen and carbon content - High resolution nuclear magnetic resonance spectroscopy method

Overview:

This method covers the determination of aromatic hydrogen and aromatic carbon contents of hydrocarbon oils. These include kerosines, gas oils, mineral lube oils, coal liquids and other distillates which are completely soluble in chloroform and/or carbon tetrachloride. The detection limit is typically 0.1% aromatic hydrogen and 0.5% carbon for Fourier transform (FT) spectrometers but for continuous wave (CW) instruments which can be used to measure aromatic hydrogen contents, the limit is considerably higher and typically 0.5%.

The method does not cover the determination of the concentrations of aromatic compounds in oils and is not applicable to samples containing more than typically 1% olefinic or phenolic compounds.