Abstract. In this paper, the contamination degree of the Rybnik Reservoir with cadmium, copper and nickel was analyzed. Quality of the water from the reservoir was determined by drawing comparisons between the metal content in the water and both the officially permitted levels (contamination factor) dnd levels of metals occurring in the water of non-contaminated areas (enrichment factor). Contanlination of bottom sediment with chosen metals was analyzed with reference to the metal content in mudstone (geoaccumulation index, enrichment factor, contamination factor). Trends towards changing the metal content in the bottonl sediment was analyzed by determining the enrichment factor of the surface layer of the bottom sediments in relation to a deeper layer. Enrichment of the bottom sediments with metals coming from the water was also determined.

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the aim of the research was to compare the chemical composition and morphology of the surface of the backsheet growing on the metallic and surface substrate growing already on the prepared mineral substrate. Moreover the aim of this study was also to analyze the dispersion of chemical elements on the cross-sections of deposits formed on parts of landfill biogas-driven engines. The chemical composition of extreme layers of mineral deposits extracted from the engine piston and their crosssections from four pistons and one head was examined by SeM-eDS. the bottom side showed a much smaller heterogeneity of the topography of the surface than the topside. the chemical composition of the deposit bottom side it primarily S (41%), Si (34%) and Al (17%). In the case of the top side, the dominated of Ca (52%) with a relatively high share of S (32%) and Si (14%). The presence of P and Mg it was also found, but only on the bottom side, and the share of fe and Zn only on the top side. in the case of cross-sections, ca, S and Si were the dominant elements. in general, there were higher Si participations in the zone of the bottom layer with a downward trend to the top sheet. the mass shares of S and ca were lower in the zone of the bottom layer with the upward trend to the top sheet, also undergoing fluctuation.

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