关键词: 顶空气相色谱-质谱法, 裂解碳九主要成分, 海水, HS-GC/MS, cracking C9, seawater

Abstract: In this study, a headspace gas chromatography-mass spectrometry (HS-GC/MS) method for simultaneous determination of cracking C9 (including α-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, β-methylstyrene, dicyclopentadiene, ninhydrin, α-methylnaphthalene and β-methylnaphthalene) in water sample was established. Briefly, 10 mL seawater was sealed in the headspace bottle and vibrated under 90℃ for 10 min to obtain gas-liquid dynamic equilibrium. Nine target compounds were separated by DB-5MS capillary column (30 m×0.25 mm×0.25 m), and quantified by internal standard method. The method had good linear relation in the range of 0.5 μg?L-1~10.0 μg?L-1, with a correlation coefficient greater than 0.998. The detection limit of the compounds in seawater is 0.50~1.00 μg?L-1. When the concentration was 1.00~10.0 μg?L-1, the average standard recovery of each compound was 82.4%~106.6% and the relative standard deviation was 3.73%~9.41%. This simple, rapid, sensitive and accurate method was suitable for the simultaneous detection of various kinds of cracking C9 in seawater, which provides a reference for the determination of cracking C9 in the emergency monitoring of marine pollution accidents.