Behavior of I-131 and Cs-137 in the Oil-Water and Oil-Gas Phase Systems

The behavior of I-131 and Cs-137 in various chemical forms in the oil-water and oil-gas phase systems and the sorption of these radionuclides from radioactive transformer oil onto various inorganic and organic sorbents was studied. The degree of the Cs-137 extraction depends neither on the time of contact of the oil with aqueous solutions nor on the (CsI)-Cs-137 concentration in the solution. Under all the experimental conditions, the degree of extraction of Cs-137 did not exceed 5%. The degree of I-131 extraction from water by the oil depends on the chemical form of the radionuclide: I-131-, (IO3-)-I-31, or I-131(2). The maximal extraction (similar to 70%) is observed for (KIO3)-I-131, and the minimal (similar to 25%), for I-131(2). Granulated nanocomposites containing particles of carbon or NaX zeolite and Fizkhimin sorbents based on coarsely porous silica gel and containing Ag and Ni in 1 : 4 ratio allow efficient removal of Cs-137 and I-131 from spent transformer oil of GK grade.