An analytical method of auto exhaust gas in urban air using active carbon tube for concentration

Abstract

In order to simplify the field measurement of the auto exhaust gas in urban air, the adsorption method using charcoal was investigated. The recommended method was as follows : 10 l air was passed through the activated charcoal of 0.5 g by means of the suction using a Mariotte bottle, then adsorbed components were desorbed by heating to 350°C and evacuating, and re-trapped. Then n-butane or pentanes as representative pollutants were analyzed by a gas chromatograph, with the values of which the total auto exhaust gas concentration was estimated. One ppb of pollutants was measured using a hydrogen ionization detector. This method was applied to the research of the urban air of Tokyo and was confirmed to be useful for the study of the pollution varing as to time and place.