Automatic Analytical System by GC／MS－SIM for Toxic Components in the Atmosphere

From some years ahead, the automatic analyzing system with GC-FID and GC-ECD has been studied and many air samples relating with hydrocarbons or halocarbons could be analyzed with success. So that，as a next technical step, it was considered that the automatic analyzing system with GC/MS-SIM was devised and was applied to the measurement of aldehyde, phenol or so on in the atmosphere. In this paper, the equipment, the analytical conditions and some field tests were illustrated. These processes were as follows : the concentration tube was 28cm x 3mmφ glass tube filled with Tenax-GC. The pollutants in 4.6l air sample were adsorbed, then desorbed by heating to 200℃ and introduced to the GC/MS fitting tocapillary column and QMS detector. One cycle of measurement was set up within 60 min and in this condition the detection limit about 0.01ppb. By selecting m/z to 94, 105, 108, 146 or 153, the derivatives from aromatics, such as phenol, benzaldehyde, cresols, dichlorobenzene and nitrocresols were automatically analyzed. It will be noticed that this system is a basic analytical technique for the many toxic pollutants of low concentration in the environment