0.100 0 g样品加入10 mL正己烷-丙酮（1+1）混合液中，于30℃超声提取20 min后，转移上清液，继续加10 mL正己烷-丙酮（1+1）混合液超声提取2次，合并上清液，用氮气吹至近干，加入5 mL水，混匀，用注射器快速注入0.75 mL丙酮和30 μL四氯化碳混合液，振荡数秒，以4 500 r·min^-1转速离心5 min，取出沉积相，采用DB-5HT石英毛细管色谱柱（15 m×0.25 mm，0.1 μm）进行分离，质谱分析中采用电子轰击离子源和选择离子监测模式。7种多溴联苯醚的质量比均在一定范围内与对应的峰面积呈线性关系，方法检出限（3S/N）在0.90~10.0 mg·kg^-1之间。加标回收率在61.3%~122%之间，测定值的相对标准偏差（n=6）在2.3%~12%之间。

The sample (0.100 0 g) was added into 10 mL of n-hexane-acetone (1+1) mixture for ultrasonic extraction at 30℃ for 20 min. After the supernatant was transferred, the sample was ultrasonically extracted twice with 10 mL of n-hexane-acetone (1+1) mixture. The combined supernatants were concentrated to nearly dry by nitrogen flowing, and 5 ml of water was added. After mixing well, a mixture of 0.75 mL of acetone and 30 μL of carbon tetrachloride were rapidly injected with a syringe, and the mixture was shaken for a few seconds and centrifuged at 4 500 r·min^-1 for 5 min. The sedimentary phase was removed and separated on a DB-5HT quartz capillary column (15 m×0.25 mm, 0.1 μm). Electron impact ion source and selective ion monitoring mode were used for mass spectrometric analysis. Linear relationships were found between the peak area and the mass ratio of the 7 PBDEs in definite ranges. The detection limits (3S/N) were between 0.90 and 10.0 mg·kg^-1. Values of recovery obtained by standard addition method were in ther range of 61.3%-122%, and the relative standard deviations (n=6) of the measured values were between 2.3% and 12%.