Sorption properties of six different coagulants with respect to the retention of cobalt, caesium, europium and uranium have been studied. The precipitating agents are ferrous sulphate, ferric chloride, aluminium sulphate, tri-sodium phosphate, ferric sulphate and zinc sulphate. The parameters investigated are pH, concentration of the precipitating agents, volume of coagulants vs time and the nature of radionuclides. The data showed that the order of hydroxide volume formed is the following: zinc sulphate > ferric chloride > ferric sulphate > ferrous sulphate, aluminium sulphate, trisodium phosphate. Hexacyanocobaltferrate was used as an adsorbant for caesium from medium-level liquid waste.