气相色谱-串联质谱法同时测定纸质食品接触材料中多环芳烃

Determination of PAHs in the Paper Packaging Materials Using Gas Chromatography-Tandem Mass Spectrometry Combined with Ultrasonic Extraction

关键词:  多环芳烃  纸质食品接触材料  气相色谱-串联质谱法  超声萃取

Key Words:polycyclic aromatic hydrocarbons  paper packaging materials  gas chromatography-tandem mass spectrometry  ultrasonic extraction

摘要:建立了一个气相色谱-串联质谱方法，对纸质食品接触材料中18种禁用多环芳烃（PAHs）进行了同时测定。该方法以丙酮-正己烷（1∶1）为萃取溶剂，在40.0℃下超声萃取纸质食品接触材料中的待测目标化合物，提取产物用硅胶固相萃取柱进行净化处理，进行气相色谱-串联质谱分析，外标法定量。在S/N（信噪比）=10的条件下，各目标化合物的定量下限为0.1~2.0 μg/kg，线性相关系数均不小于0.998,各目标化合物的平均加标回收率为57.5%～96.4%，相对标准偏差为3.0%～9.8%，该方法简便快捷，定性准确，定量下限低，可满足多环芳烃检测的技术要求，适用于纸质食品接触材料中PAHs含量的测定。

Abstract:An effective method was established for the simultaneous determination of 18 kinds of banned polycyclic aromatic hydrocarbons（PAHs）in paper packaging materials which were intended to be used to contact with foodstuffs. PAHs in paper packaging materials were ultrasonically extracted with acetone-hexane（1∶1）as the extraction solvent at 40.0℃, the extractive was purified by silica solid phase extraction column. The extractive was analyzed by gas chromatography-tandem mass spectrometry and the contents of each analytes were calibrated by external standard method. The limits of quantitation（LOQ）changed from 0.1 μg/kg to 2.0 μg/kg at the condition of signal/noise（S/N）of 10. At the same time, the correlation coefficients were all higher than 0.998. The spiked average recoveries varied from 57.5% to 96.4% while the relative standard deviation（RSD）changed from 3.0% to 9.8%. The method was rapid, simple, accurate and sensitive, which could satisfy completely the demand of the analysis of PAHs in paper packaging materials which were intended to contact with foodstuffs.