Abstract:
[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.