A method was developed for the simultaneous determination of phthalic acid esters (PAEs) in edible oils by multiple linear regression (MLR) combined with UV-vis spectrophotometry. The samples were extracted by acetonitrile, cleaned up and concentrated by Silica/primary-secondary amine (PSA) composite packed glass solid phase extraction column and pretreated with UV-vis spectrophotometer for waveband scanning and multiple linear regression analysis models for qualitative quantification. The PAEs prediction model A and PAEs prediction model B were developed based on the concentration distribution range of PAEs in edible oil samples in the market and their linear relationship with absorbance, and applied to the simultaneous determination of three PAEs, dibutyl phthalate (DBP), dioctyl phthalate (DOP), and benzyl butyl phthalate (BBP), and two PAEs, DBP, and DOP, respectively. The limits of quantification of DBP, DOP, and BBP in model A were 0.125 mg/kg, 0.100 mg/kg, and 0.150 mg/kg, respectively, with the recoveries of 93%-111% and the relative standard deviations (RSDs) of 3.86%-7.09%. The limits of quantification of DBP and DOP in model B were 0.250 mg/kg and 0.375 mg/kg. The limits of quantification for DBP and DOP in model B were 0.250 mg/kg and 0.375 mg/kg, respectively, with recoveries of 95%-103% and RSDs of 2.22%-4.17%. The two models can be selected according to different types of edible oil samples and different determination needs. DBP and DOP measured by model B are the two most commonly used plasticizers in plastic products and have high accuracy. The analytical results of this method for the determination of DBP, DOP, and BBP in edible oil were similar to those of the high-performance liquid chromatography method, with a relative error (RE) of less than ±8%. The method has good reproducibility, high precision, no need to use large instruments, fast, convenient and easy while having certain accuracy.
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