A convenient and rapid direct infrared method for determining 4-methyl-2,6-ditertiarybutylphenol in mineral oil has been developed that uses the 2.74-micron hydroxyl band. The spectrum of the sample is recorded between 2.65 and 2.85 microns to obtain a pair of absorbances from which the phenol concentration is determined. The corresponding phenol-free oil is not needed, and no sample preparation is required when other substances containing the hydroxyl group are absent. The method is accurate to 0.01% phenol; instrument time is about five minutes.
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George H. Bain (1956) studied this question.
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