The study was conducted on the Biała Lądecka River which is a mountain river. It is similar to many European mountain rivers in terms of hydromorphology and catchment management. The aim of this study was to determine the bioconcentration factors of heavy metals (Pb, Cd, Hg, Ni, Cr, Cu and Zn) in Ranunculus aquatile (L.) Dumort., Fontinalis antipyretica (L. ex Hedw.), and Lemanea fluviatilis (L.) C.Ag. The content of metals in water, sediment, and submerged plants was determined. The metal concentrations in plants can be arranged as follows: Hg < Cd < Cr < Ni < Cu < Pb <Zn. The highest concentrations of Hg, Ni, Cr, and Cu were observed in F. antipyretica, but the highest concentrations of Pb, Cd, and Zn were in R. aquatile. L. fluviatilis always contained the least amounts of heavy metals. Bioconcentration factors (BCFs) were lowest in L. fluviatilis and highest in F. antipyretica. Among the analyzed metals, plants accumulated the highest amount of Zn, and the least of Hg. The BCFs for Zn were from 24111 (in L. fluviatilis) to 97574 (in R. aquatile), and BCFs for Hg were from 29 (in L. fluviatilis) to 226 (in F. antipyretica).

The paper characterises the method of estimating the size of the areas supplying radon to radon groundwater intakes. It is presented on the example of the intakes of radon groundwaters and radon acidulous waters of Lądek Zdrój, Świeradów Zdrój and Kowary. The results of appropriate calculations prove that the volume of rocks supplying radon to the groundwaters of particular intakes oscillates from over ten to several hundred thousand cubic metres. Considering the depth of the zone where radon saturation of these waters takes place, the area supplying this gas to particular intakes varies from several hundred to several thousand square metres. The largest areas of radon-222 supply are characteristic of the most discharge springs, while the smallest ones belong to the springs of low discharge, especially the intakes of groundwater mixture, where only one component supplies large quantities of radon-222. The recharge areas of groundwaters in which