Abstract
The natural process of sulphate reduction takes place in the Rontok Pond. During the reduction the concentration of sulphate in the pond water decreases. The changes of δ34S in the pond water are typical for bacterial reduction. The reduction process in the Rontok Pond causes dissolution of barium and the radium from the pond sediments into the water. Concentrations of barium and 226Ra in the discharged water from the Silesia Coal Mine are lower than in water flowing out of the Rontok Pond into the Vistula River. The opposite trend is observed for iron and also Zn, Co, Ni, Mn, Al and Cu because of the precipitation of ferric hydroxide in the stream. The reduction process, which causes dissolution of barium and radium in water, can explain the release of these elements into the Vistula River. The dissolution of toxic elements can be reduced by the precipitation of non-toxic deposits on the sediment of Rontok Pond.
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