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An assay method was investigated for the determination of the ratio of 2- and 3-isomers in butylated hydroxyanisole. The developed procedure involves dilution of the sample with acetone and injection into a gas chromatograph equipped with a hydrogen flame ionization detector. Diphenylamine is a suitable internal standard. XE–60 liquid phase effected an excellent resolution of the 2- and 3-isomers and diphenylamine. The method is quantitative and rapid; the chromatogram is completed in approximately 20 min.

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