<報文>光化学スモッグ成分に対する芳香族炭化水素の役割 : トルエンの光化学反応について

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The photochemical reaction of toluene (8 ppm) in the presence of NO (4ppm) and air (760 torr) was studied in detail. The main products were o-cresol, benzaldehyde, 6-nitro-o-cresol, 2-nitro-p-cresol, benzoic acid, maleic anhydride and CO, CO2. These reactions were classified into 4 groups, such as dissociation of side-chain, cleavage of aromatic ring, addition to side chain and　addition to aromatic ring. In order to research the atmospheric reaction, benzaldehyde, acetophenone, 2-nitro-p-cresol, o-cresol, benzoic acid and toluene in the atmosphere were measured from July to August 1978 by GC-MS-SIM method. From 130 data, the average concentration, the time-variation at photochemical smog days, and correlation of them were obtained. At photochemical smog days, the average concentration of benzoic acid was 5.9ppb, benzaldehyde 0.67ppb, acetophenone 0.61ppb, 2-nitro-p-cresol 0.11ppb, o-cresol 0.019ppb and toluene was 3.8 ppb. Comparing the atmospheric phenomena with the chamber reaction, it was found that the aromatic reaction was occurred in air in analogy with experiment but the air reaction had some remarkable differences, One of which was a large acceleration in the rate of reaction. In this way, the environmental analysis was concluded to be important in the study of photochemical smog.
横浜国立大学の論文