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以有机氯类、有机磷类、氯酚类、多环芳烃类、氨基甲酸酯类、菊酯类及三嗪类共7类27种半挥发性有机污染物(SVOCs)为研究对象,以气相色谱-串联质谱技术为基础,对27种SVOCs的前处理方法—液液萃取和固相萃取进行了比较。研究发现:液液萃取法成本低,操作相对复杂,一次最多只能保证26种SVOCs(五氯酚需要单独反萃取)的回收率在70%~120%,但五氯酚和菊酯类农药的液液萃取效果要优于固相萃取,适用于少数样品的分类检测分析;而固相萃取自动化程度高,样品重现性好,检测限低,能够同时满足27种目标物的回收率在70%~120%,适合用大批量、多种类的检测分析;可根据实验室条件以及任务要求选择适当的分析方法。
Seven kinds of 27 volatile organic compounds (SVOCs), including seven kinds of organic chlorine, organic phosphorus, chlorophenols, polycyclic aromatic hydrocarbons, carbamates, pyrethroids and triazines, Chromatography-tandem mass spectrometry (GC-MS / MS) was used to compare the pretreatment methods of 27 SVOCs - liquid-liquid extraction and solid-phase extraction. The results show that the liquid-liquid extraction method has the advantages of low cost and relatively complicated operation. The recovery rate of 26 SVOCs (pentachlorophenol need to be stripped separately) is 70% -120% at most, but pentachlorophenol and pyrethroid pesticides Of the liquid-liquid extraction is better than the solid-phase extraction, suitable for a small number of samples of the detection and analysis; and a high degree of automation of solid-phase extraction, sample reproducibility, low detection limit, can simultaneously meet the 27 target recovery rate 70% ~ 120%, suitable for high-volume, multi-type test analysis; according to laboratory conditions and mission requirements to choose the appropriate analysis.