XPS AND EPMA STUDY OF SIZE-FRACTIONATED AMBIENT AEROSOL-PARTICLES COLLECTED IN URBAN AND INDUSTRIAL-AREAS

Ambient aerosol particles were studied by XPS (ESCA) and electron prob e microanalysis energy-dispersive x-ray spectrometry (EPMA-EDX) in a n on-destructive way, For sampling, polytetrafluoroethylene (PTFE) sampl ers were used in Battelle-type cascade impactors. Sampling locations a nd times were: Visonta (North Hungary), at a coal-fired power plant at two sites, 23 September 1992; Debrecen city centre, in 3-h periods as a function of daytime, 11 November 1992. From XPS dhe chemical states of the compounds of the particles could he identified mainly as NHx, SO42-, soot and SiO2. By XPS, correlation could be found between the n itrogen (N) and carbon (C) content of the particles of 0.5 and 1 mu m size fractions. The concentration ratios of sulphur (S) distribution b etween the 0.5 and 1 mu m particles showed higher S content in the sma ller fraction, In Visonta these EDX S ratios were similar at both site s, while the XPS Patio was smaller far from the plume, In Debrecen the ratios were smaller than in Visonta with both methods, Hn Debrecen du ring the daytime periods the EDX ratios showed a maximum at the noon p eriod, while the XPS ratios decreased, Surface enrichment of S was ver y changeable as a function of sampling places and time periods, The S enrichment factors changed from 1.5 to 5.5 in the 0.5 acid 1 pm partic le fractions, The EDX elemental (Al, Si, Cl, K, Ca, Fe, Cu, Zn) concen trations of the particles were discussed as tracers of different sourc es of aerosols, (C) 1997 John Wiley & Sons, Ltd.