The Detection Of Phthalates In Alcohol By GC-MS

In recent years, the public paid close attention to the food contamination caused by phthalic acid esters(PAEs). Residual PAEs in alcohol is a potential security risk to consumer’s health. Alcohol has so much variety and complex components, thus establishing reasonable sample pretreatment methods and efficient, sensitive detection means was particularly important. This paper took alcohol samples and cap gasket as the research object,which studied the detection methods and the migration of PAEs. The paper affords major results as follows:1. A quick and easy determining method of residual PAEs in beer by GC-MS was established. NaCl addition and ultrasound in extracting PAEs from samples using n-hexane enhanced extraction efficiency and eliminated emulsification effectively. Under the analytical conditions, 12 PAEs had good linearity. The average recoveries of three concentrations(25,50, 125μg/L) reached 88.21~110.11% with the relative standard deviation(RSD, n = 6) of0.40~5.49%. This method was successfully applied in the determination of PAEs in 30 beer samples and got reliable results.2. A method for residual PAEs determination in liquor was developed, which was accurate and reproducible. Increasing the ultrasonic extraction times improved the repeatability of the method, and water bath heated in the temperature of 90 oC avoided the influence of ethanol on test results. The average recoveries reached 73.08%~105.35% with the relative standard deviation(RSD, n = 6) of 0.35%~6.00%.3. Migratory characteristics of PAEs in different alcohol content were studied. The method was: weighing 0.5 g plastic washer in glass bottle, adding 10 ml of distilled water, 5%,10%, 20%, 40% ethanol solution respectively, and storage at ambient temperature, took out 4ml, extracted by n-hexane, then detected. The average recoveries reached 71.01%~112.59%.PAEs could migrate into simulants from gaskets. The sequence of PAEs migration rate in simulants was: 40% ethanol>20% ethanol>10% ethanol>5% ethanol ≈distilled water.