Abstract
1H-NMR chemical shifts of 1, 1, 2-trichloroethane in various types of aliphatic hydrocarbon solvents(n-types, branched types and cyclic types) and aromatic hydrocarbon solvents(benzene substitution compounds) were measured. In the spectrum of 1, 1, 2-trichlo-roethane dissolved in aliphatic hydrocarbons the CH2 and CH proton signals are approximately constant. On the other hand, in the case of 1, 1, 2-trichloroethane dissolved in aromatic hydrocarbons, their proton signals were induced at up-field by the magnetic anisotropy effects of aromatic rings. The relationship between the magnitude of the up-field shifts of the protons of 1, 1, 2-trichloroethane and the concentration of aromatic constituents was discussed in view of the determination of aromatic constituents in petroleum products. The magnitude of up-field shifts of the protons in 1, 1, 2-trichloroethane is related to the contents of aromatic constituents. Therefore, it was found that the results above-mentioned is applicable to the determination of aromatic constituents in petroleum products. This method is simple and rapid determination of the total aromatic constituents in petroleum products.
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