ANALYSIS AND CLASSIFICATION OF INDIVIDUAL OUTDOOR AEROSOL-PARTICLES WITH SIMS TIME-OF-FLIGHT MASS-SPECTROMETRY

Individual aerosol particles sampled in the north of the city Karlsruh e were analysed with a TOF-SIMS instrument. The results confirmed the integral analysis of many particles [1]. In order to employ a signal p attern analysis of the negative secondary ions for the classification of organic compounds an earlier classification scheme for 5 keV Ar+ bo mbardment was found to be generally also applicable for the TOF-SIMS c onditions. Two main classes of particles were distinguished, which con sist of submicron mainly organic particles of vehicle traffic provenan ce on one side and coarse particles of geogenic sources on the other s ide. Additionally, the geogenic class could be devided into a fraction consisting of lime soil and a fraction with alumo-silicate soil. A qu antification of the class population was performed by counting the par ticles of different type.