Study On The Migration Of Phthalate Esters From Plastics To Different SSimulate Solutions

This thesis consists of three chapters.In CHAPTER ONE, The nature, uses and hazards of phthalates are introduced briefly. The important of studying on the migration of phthalates is described. The current state of migration of phthalates in plastics is summarized from the determination of phthalate esters and ipact ion on the migration of phthalates.In CHAPTER TWO, The dissolved amounts of seventeen phthalate esters (PAEs) in plastics soaked in simulated sweat has been determinated firstly by dispersive liquid liquid microextraction (DLLME) coupled with gas chromatography. In five kinds of samples (plastic toys, plastic cups, nitriled gloves, plastic spoon and plastics package bag), di-2-ethylhexyl phthalate was detected simultaneously and the highest dissolved amount was 51.5μg/L.But in plastics package bag, dissolved amount of bis-2-ethoxyethyl phthalate was the highest, was 111μg/L. The limits of detection were 0.21-5.1μg/L. The recoveries ranged from 74.7% to 100%, with the relative standard deviations (n=4) falling between 5.2% and 16%.In CHAPTER THREE, In order to find out the migration behavior of plasticizers from plastic packaging materials to food, their dissolution in food simulants was studied. The rule of dissolution of DBP and DEHP in self-mixed polyvinyl chloride film was studied with the time and temperature when hexane,10% ethanol,3% acetic acid and pure water were chosen as food simulants. The dissolution of DBP and DEHP in 3% acetic acidic aqueous solution and water were studied under the microwave treatment conditions, simultaneosly. The dissolution rates of DBP and DEHP in n-hexane were the highest among the selected food simulants, they were 3.86% and 2.28% respectively. DBP was only detected in 10% ethanol and 3% acetic acid solutions. None of DBP and DEHP was detected in water under the selected conditions. The effect of short time dipping at high temperature was the same as long time dipping at low temperature. In comparison with individual heating, microwave treatment can best promote the dissolution rate of DBP.