Objective To determine the concentration of di-n-butyl phthalate (DBP) and di(2-ethylhexyl) phthalate (DEHP) in various samples of cooking oil.
Methods DBP and DEHP in samples of various kinds of cooking oil, such as unheated cooking oil, heated cooking oil and the condensation of oil fume in domestic kitchens and a canteen; unheated cooking oil and remnant oil in pot used by stall-keepers or by fast food restaurants, were determined by Gas Chromatograph-Mass Spectrometry (GC-MS) with selected ion recording (SIR) technique.
Results DBP and DEHP in various samples of cooking oil in nine domestic kitchens and a canteen, among which the concentration of DBP (2.29-597.01 μg/g) and DEHP (38.96-4774.72 μg/g) in the condensation of cooking oil fume were higher than unheated cooking oil or the remnant oil in pot(DBP 3.22-42.81 μg/g, DEHP 15.61-112.64 μg/g). Moreover, DBP and DEHP could be detected in only one sample of remnant oil used by stall-keepers, but not detected in the samples in fast food restaurants.
Conclusion Most samples of cooking oil were polluted by DBP and DEHP, concentrations of which increased significantly in the condensation of cooking oil fume.
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