Aromatic and other contents in automobile gasoline in Japan.

Automobile gasoline samples, 214 in total, were collected in 14 major cities in various parts of Japan in the autumn of 1983, and analyzed for aromatic and other contents on a Silicone OV 101 capillary GC column. n-Hexane, benzene, toluene and xylenes (3 isomers plus ethylbenzene) contents were 5.7, 1.4, 8.1 and 10.4% (v/v) as grand means, respectively. There was no remarkable vairation in contents between the samples from different cities nor the samples of different brands. Comparison with the results of a 1976 study disclosed no apparent changes in aromatic contents in the past 7 years.