38 Nu clear Tech nol ogy & Ra di a tion Pro tec tion –1/2005 X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF INTERACTION OF Np 5+ WITH GOETHITE a-FeOOH by

Abstract

n+ com plexes on the sur face of goethite a-(FeOOH) re sulted from the in ter ac tion of neptunyl ni trate (NpO 2NO 3, 10-6 M) in the aque ous me dia with the back ground elec tro lyte (NaClO 4) of ionic force 0.1 M (pH = 7.0 � 0.2) were formed and stud ied with the X-ray pho to elec tron spec tros copy. The X-ray pho to elec tron spec-tros copy ionic and el e men tal quan ti ta tive anal y sis of the goethite and prod ucts of its in ter ac tion with neptunyl and plutonyl ni trates was car ried out. It was es tab lished that dur ing the stud ied neptunyl ni trate – goethite in ter ac tion Np 4+ and Np 6+ com pounds did not to form, while the com plexes of neptunyl group NpO