超声提取-气相色谱-质谱法测定水体沉积物中16种多环芳烃

摘要

Sixteen polycyclic aromatic hydrocarbons (PAH's) were separated from water sediment by ultrasonic extraction with CH2Cl2, and the extract was purified and concentrated to about 0. 5 mL. Rtx-5MS capillary column was used for separation. The identification of the 16 PAH's was performed by comparing spectra obtained by MS detector with NIST05 atlas database; and quantification was performed by GC using external standard method with hydrogen flame ionization detector (FID). Values of detection limit (3S/N) of the method found were in the range of 0. 27 — 6. 0 μg · kg-1. Values of recovery found by the standard addition method, were ranged from 56% to 96% with RSD's (n = 5) ranged from 1. 2% to 8. 3%.%以二氯甲烷为提取剂对水体沉积物中16种多环芳烃进行提取,弗罗里硅土柱净化,所得净化液浓缩至约0.5 mL,用Rtx-5MS毛细管柱进行分离.采用质谱检测器根据NIST05谱图 库比对进行定性分析；采用氢火焰离子化检测器按外标法进行气相色谱定量分析.结果表明:16种多环芳烃的检出限(3S/N)在0.27～6.0μg·kg-1之间.用标准加入法测得回收率在56％～96％之间,相对标准偏差(n=5)在1.2％～8.3％之间.