气相色谱-质谱法测定塑料玩具中多环芳烃

提出了气相色谱-质谱法测定塑料玩具中16种多环芳烃(PAH′s)含量的方法。样品经正己烷超声提取30min后,40℃水浴氮气吹干。用水、甲醇和正己烷-二氯甲烷(3+2)混合溶剂各5mL溶解残渣,过C18固相萃取柱净化,用正己烷-二氯甲烷(3+2)混合溶液洗脱,所得洗脱液过HP-5MS色谱柱分离,电子轰击离子源检测。16种多环芳烃的质量浓度在0.2～4.0mg·L-1范围内与其峰面积呈线性关系,方法的检出限(3S/N)在0.002～0.021mg·kg-1之间。以聚丙乙烯、聚乙烯、聚氯乙烯或丙烯腈-丁二烯-苯乙烯共聚物等4种材质的塑料玩具为基体,进行加标回收试验,回收率在79.6%～95.2%之间。

GC-MS Determination of Polycyclic Aromatic Hydrocarbons in Plastic Toys

GC-MS was applied to the determination of 16 polycyclic aromatic hydrocarbons(PAH′s) in plastic toys.Sample was extracted ultrasonically with n-hexane for 30 min,and the extract was evaporated to dryness in a water bath at 40 ℃ by N2-blowing.The residue was dissolved with 5 mL of H2O,5 mL of CH3OH and 5 mL of mixture of n-hexane and CH2Cl2(3+2),and purified by passing through C18 SPE column and eluted with mixed solvent of n-hexane-CH2Cl2(3+2).The analyte were separated on HP-5MS column and EI source was used in MS.Linear relationships between values of peak area and mass concentration of the 16 PAH′s were kept in the same range of 0.2-4.0 mg·L-1,with detection limits(3S/N) in the range of 0.002-0.021 mg·kg-1.Tests for recovery were made by standard addition method with 4 kinds of plastic toys(made with PP,PE,PVC or ABS) as matrixes,values of recovery found were in the range of 79.6%-95.2%.