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The aim of the study was to evaluate selected properties of fly ash and bottom ash produced after co-combustion of biomass (30%) and hard coal in a fluidized bed boiler. As part of the study, the pH of the test material was determined and its elemental composition was analyzed using X-ray fluorescence (XRF). Additionally, the ecotoxic properties of combustion by-products (CBPs) were assessed using an acute toxicity test on aqueous extracts (relative to the test plant: Lepidium sativum) and a standardized phytotoxi...