DEPTH-RESOLVED INVESTIGATION OF THE ELEMENT AND COMPOUND INVENTORY OFAEROSOL-PARTICLES FROM OUTDOOR AIR

Plasma-based SNMS has been employed to perform a depth-resolved elemen tal analysis of aerosol particles collected in a suburban area near Ka rlsruhe. Two classes of particles could be distinguished. Both of them exhibited a significant depth structure. Submicron particles have bee n found with a 15 nm deep ammonium sulphate surface layer on carbon ri ch cores. The other class consisted of coarse particles of several mu m size which even showed a double layer system enclosing geogenic core s. For depth-scaling a new internal calibration procedure has been tes ted and found to be suitable for the complex environmental material. D ynamic SIMS measurements have been used to investigate especially the carbon compounds of the particles by evaluation of small cluster ion s ignal patterns.