Leaching of 137~Cs and 90~Sr contaminated soils by FeCl_2 and NH_4Cl solutions

摘要

The leachig of 137~Cr radionuclides contaminated soils by solutions of FeCl_3 and NH_4Cl in batch (static), column (continuous-flow) and field (Chernobyl region) experiments is investigated. The eluen solution is a 1:1 mixture of 0.01-0.02 mol 1~-1 FeCl_3 and NH_4Cl. The equilibrium distribution coefficients of 137~Cs and Fe~3+ between a Chernobyl sandy loam sample and the eluent are determined to be 25 and 3800, respectively. The first order rate constants of ion exchange reactions for the 0.01 M eluent were 10~-6 s~-1 for 137~Cs and 10~4 s~-1 for 90~Sr.