Abstract
The authors have developed a simple and precise instrumental method applying the infrared spectroscopic analysis for the determination of anti-icing additive which is usually added in a large amount and has an important factor among various additives used in jet fuel. This is a method of infrared spectrophotometric analysis to determine the additive, availing the infrared characteristics spectra of both sample and water-extracted oil based on their C-O-C stretching vibrations (1, 130cm-1). The method is more satisfactory than the conventional chemical method both in accuracy and precision, e. g., less than 0.8% in average deviation in the range of 0.05-0.3vol% of concentration and 0.006vol% in detectable concentration. These values are also equivalent to ones which were obtained in applying the infrared spectra due to the stretching vibrations of C-O (1, 070cm-1). Even when other additives such as corrosion inhibitor, oxidation inhibitor and metal deactivator were coexisting, they did not influence the analytical results. And the determination of infrared spectra per sample required only 30 minutes of operation time and a minimum amount of 5ml of sample.
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