Abstract
The control of the radioactivity level of surface water contaminated by radioactive waste from uranium ore mining and processing revealed higher concentration of dissolved radium in places several kilometres far from the place of the outlet of the wastes than in the outlet itself. After the finding that the pH of surface waters does not play the main role in releasing radium from the sediments, we experimentally studied the influence of inorganic salts concentration. Homogenized and dried samples of uranium ores and sediments were shaken with distilled water together with 1 N, 0.1 N and 0.01 N concentrations of BaCl2, SrCl2, MgCl2, CaCl2, LiCl, NaCl, KCl, (NH4)2SO4, Na3PO4, K3PO4 and MgCO3 salts. It was found, that 95–100% of radium bound in sediments was released in 1 N solutions of KCl and NaCl salts, dependent on their structure and mineralogical composition. Positive effect on the leachability of radium has also CaCl2 solution.
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