DETERMINATION OF IODINE VALUE OF LUBRICATING OILS BY NUCLEAR-MAGNETIC-RESONANCE (NMR) SPECTROSCOPY

A direct, quick and non-destructive method for estimating the iodine v alue of fats, fatty oils and their blends in mineral oils has been dev eloped based on H-1 and C-13-NMR spectroscopy. The method involves the determination of unsaturation content of the samples by H-1 and C-13- NMR spectroscopic techniques. The iodine value of the sample is direct ly proportional to the unsaturated proton or carbon content. The value of the proportionality constant is independent of the nature of the f ats and their blends in mineral oils for the limited samples studied. The iodine value determined by this method also includes the contribut ion from additives containing unsaturation. Saturated ingredients in t he sample do not contribute to the iodine value as is the case with th e standard IP-84 method.