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fiable crystalline compounds which mostly contained Zn or Pb. Althou no quantitative measurementsare availableforthesecompounds, itcan beconclud- ed on t8e basis of -ray diffractometric analyseghat the main crystalline components are as follows: - - According to individual particle analyses, the following applies to the frequency of occurrence of elements: - Na, Mg, AI, , 5, CI, , Ca, Ti, Fe, Zn, Sr, Ba, Pb in more than 7% of all particles, - , , , 0, , Si, Co, Rb in 3 to 7% of all particles, - , Cr, Mn, Ni, Cu, As, Cd, Sn, Mo, Cs, Hg in 1 to 3% of all particles, and - Sc, Ag, In in less than 1% of all particles. The maximum contents of the trace and heavy metal elements detected in individual, submic- ron particles fluctuate as follows: - for Pb, Co, Mo, Sn, Zn and : between 1 and 3% by weight of the oxides, - for Mn, Ni, Nb and Zr: between 1.2 and 8.8% by weight of the oxides, and - for TI and Se: always less than 1% by weight of the oxides. ~ in the case of dust 0: *ZnC1,ZnFP0 and galenite and, in the case of dust IO: quartz, anhydrite and halite. 1 Investigations of the possibility of particle size-dependent accumulation of trace elements failed to yield any results due to the chemical heterogeneity of the clean-gas dust particles made up of aggregated primary particles Clean-gas dusts from coal-fired power stations Comparatively homogeneous conditions are found in the clean-gas dusts from coal-fired power stations Five different dust components can be differentiated in both dry furnace and slag tap furnace dusts 1 Aluminosilicate, mostly spherical vitreous particles, comprising more than approx 9% of the dusts, 2 Surface coatings and surface compounds on the vitreous particles, consisting predomi- nantly of Ca-sulphates, Ca-phosphates and, less commonly, CI or hydrocarbon-bearing compounds, 3 /4 Two different pes of coke fractions (so-called "low-temperature coke"and "corrugat- ed sheet coke"ywhich, together, comprise less t