Uranium and polonium isotopes were measured in tap water and groundwater from the Warsaw area (Poland). The mean values of 210 Po, 234 U and 238 U in surface intakes were 0.12, 3.91 and 2.75 mBq dm −3 and for deep water intakes were 0.25, 0.24 and 0.20 mBq dm −3 , respectively. The annual dose absorbed as a result of the consumption of drinking water by a inhabitant was calculated on the basis of measurements of polonium and uranium activity. The calculated value is only a negligible part (approximately 0.02%) of the dose taken from natural sources, which is estimated at 2.4 mSv year −1 .
Water and sediment chemical compositions were investigated in 75 post-mining lakes in the eastern part of the Muskau Arch region (Western Poland, Central Europe). The lakes, originating from lignite and clay surfaces and underground mining activity, exhibited a wide gradient of physical and chemical water parameters. The most pronounced variability in water parameters was observed in pH values, conductivity, and oxygen concentration in the mixolimnion and monimolimnion. In addition, the lakes varied in terms of their trophic status, indicated by their dissolved organic carbon (DOC) and phosphorous concentrations. In general, lakes with higher pH values had higher trophic states, and some even exhibited hypertrophic conditions. The Monte Carlo test indicated that the water pH, phosphorus, DOC, and silicon concentrations could significantly explain the chemical characteristics of sediments.
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