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以甲醛为主要污染物的低级脂肪族羰基化合物是具有焦臭气味的恶臭物,最高允许浓度为0.05～0.2 ppm。挥发性羰基化合物的来源,主要是汽车尾气、香烟烟雾、食品加工以及某些有机化合物、SO_x、NO_x和O_3的光化学反应产物。空气中羰基化合物异构体的沸点比较接近,分离测定比较困难。本文介绍的分析方法,使用液相中强极性的1,2,3-三-2-氰基乙氧基丙烷(TCEP)的气相色谱法,并且以液态氩等作为冷冻剂。实验证明,本法能迅速、方便地测定游离态的低级脂肪族羰基化合物(C_2～C_5),灵敏度很高。并
Lower aliphatic carbonyl compounds mainly containing formaldehyde are odorant with a stench smell, and the maximum allowable concentration is 0.05 to 0.2 ppm. The sources of volatile carbonyl compounds are mainly automobile exhaust, cigarette smoke, food processing and the photochemical reaction products of certain organic compounds, SOx, NOx and O_3. The boiling point of the carbonyl compounds in the air is relatively close, the determination of the separation more difficult. The analytical method described in this article uses gas chromatography with strongly polar 1,2,3-tri-2-cyanoethoxypropane (TCEP) in the liquid phase and uses liquid argon or the like as a cryogen. Experiments show that this method can quickly and easily determine the free lower aliphatic carbonyl compounds (C_2-C_5) with high sensitivity. and