中文摘要：

用分散液液微萃取-气相色谱/质谱法测定水样中的16种多环芳烃（PAHs）。通过实验确定最佳萃取条件为：20μL四氯化碳作萃取剂,1.0 mL乙腈作分散剂,超声萃取1 min。在优化条件下,多环芳烃的富集倍数达到216～511,方法在0.05～50μg/L范围内呈良好的线性关系,相关系数（R2）在0.9873～0.9983之间,检出限为0.0020～0.14μg/L。相对标准偏差（RSD）在3.82%～12.45%（n=6）之间。该方法成功用于实际水样中痕量多环芳烃的测定。

英文摘要：

Dispersive liquid-liquid microextraction（DLLME） combined with gas chromatography-mass spectrometry was used to extract and determine polycyclic aromatic hydrocarbons（PAHs） in water samples.Several parameters in the extraction procedure,such as the extraction and dispersive solvents and their volumes,salinity,extraction time,and shaking mode,were optimized.Under the optimum conditions（20 μL carbon tetrachloride as the extraction solvent,1.0 mL acetonitrile as the dispersive solvent,sonication for 1 min）,enrichment factors in the range of 216~511 were achieved.The linearity of the method was from 0.05 to 50 μg/L,with correlation coefficients（R2） varying from 0.9873 to 0.9983.The limits of detection ranged from 0.0020 to 0.14 μg/L.The relative standard deviations at a spike concentration of 20 μg/L were ranged from 3.82% to 12.45%（n=6）.The method was successfully used for the determination of PAHs in river water samples.