NUKLEONIKA 2005, 50(2):57-60

KINETICS OF URANYL ION POLYMERIZATION IN THE PRESENCE OF AMMONIUM HYDROXIDE

I. D. Abdelrazek1, W. I. Zidan2, H. A. Farag3, M. F. Barakat2

1 National Research Center, ETRR-2, Atomic Energy Authority, Inshas, P. O. Box 13759, Cairo, Egypt,
2 National Center for Nuclear Safety and Radiation Control, Atomic Energy Authority, Nasr City, P. O. Box 7551, 11762 Cairo, Egypt,
3 Chemical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt

Kinetics of the polymerization of UO22+ ion to UO2[(OH)2UO2]42+ in the ammonia-uranyl nitrate system has been studied. The deepening of the color formed with the addition of ammonia made it possible to estimate spectrophotometrically the concentration of the formed UO2[(OH)2UO2]42+ ions in the solution at 420.6 nm. The effects of pH, temperature as well as the concentration of uranyl ion have been investigated. The reaction rate equation for the polymerization reaction is presented. Linear dependencies of logarithm of the apparent reaction-rate constant on both pH and the reverse of temperature were observed.