ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 39, Number 7
JKCSEZ 39(7)
February 20, 1995 

In order to separate and preconcentrate 137Cs selectively, NH4PW-silica gel inorganic ion exchanger was prepared by dispersion of the NH4PW particles into the silica gel matrix, and its sorption properties for Cs+ and physical and chemical stabilities were investigated. It was thermally stable up to 400℃ and at pH range below 9.5. Overall capacities of the 70 wt% NH4PW-silica gel in 0.1 and 5 M HNO3 solutions were 0.31 and 0.27 mmol/g respectively. It was identified for the 70 wt% NH4PW-sxilica gel to remove above 99% of 134Cs and 137Cs from a highly acidic radioactive waste solution containing various radionuclides.