Spectroscopic characterization of Greek dolomitic marble surface interacted with uranium and thorium in aqueous solutions

✍ Scribed by A. Godelitsas; M. Kokkoris; E. Chatzitheodoridis; P. Misaelides

• Book ID: 103862849
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 599 KB
• Volume: 266
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2008.03.073

✦ Synopsis

The surface of a typical Greek (Thassian) dolomitic marble was studied after interaction with U-and Th-containing aqueous solutions (1000 mg/L, free-drift experiments for 1 week at atmospheric P CO 2 ), using 12 C-RBS and Laser l-Raman spectroscopy. Powder-XRD and SEM-EDS were also applied to investigate the phases deposited on the surface of the interacted samples. The obtained results indicated a considerable removal of U from the aqueous medium mainly due to massive surface precipitation of amorphous UO 2 -hydroxide phases forming a relatively thick (lm-sized) coating on the carbonate substrate. The interaction of Th with dolomitic marble surface is also intense leading to a formation of an amorphous Th-hydroxide layer of similar thickness but of significantly lower elemental atomic proportion.