【摘要】 针对中国当前臭氧污染问题,建立了苏玛罐采样-低温浓缩/气相色谱-质谱法分析环境空气中57种臭氧前体物的方法。样品经三级冷阱预浓缩仪富集、除干扰组分并进行冷聚焦后利用冷柱温分离,气相色谱-质谱法分析。笔者优化了阱的关键温度和时间参数,在最佳实验条件下进行方法性能实验,结果表明,57种目标化合物的方法检出限为0.03×10^-6～0.39×10^-6,高、中、低3组浓度水平的相对标准偏差（RSD）为0.5%～11%（n=6）,空白加标回收率为80.1%～112%。方法成功应用于山东省17个采样城市环境空气样品的分析。更多还原

【Abstract】 In order to analyze the cause of severe O₃ pollution in China, this study proposed a method to determine 57 ozone precursors compounds in ambient air based on canister sampling-cryogenic traping/GC-MS. Samples were cryogenically preconcentrated and focused after interfering substances removed, then determined by GC-MS. In this paper, key temperature and time parameters of cold traps were optimised, experiment performances of the method were conducted under optimum conditions. The results showed that under the optimized conditions, the method detection limits of 57 compounds were between 0.03×10^-6-0.39×10^-6. The method showed high accuracy and validity, three levels of the relative standard（RSD） were in the range of 0.5%-11%（n=6）, spiked sample recoveries were in the range of 80.1%-112%. This method was successfully used for the determination of ambient air samples in 17 citis of Shangdong province.更多还原