title: Extraction of moderate oxidation state technetium species between 30 % tri-n-butyl phosphate and H2SO4/HNO3.
abstract: The extraction of technetium species at oxidation state lower than +7 has been examined in sulfuric and sulfuric/nitric acid solutions using UV-Vis spectroscopy and optically transparent thin layer cell (RVC-OTTLE). Soluble Tc(III), TcO2+and [Tc2O2]3+species with absorption bands at 420-450, 400, and 502 nm, respectively, were detected as products of pertechnetates electroreduction. The distribution ratios of99Tc with lower than +VII oxidation state ionic species between 4 M H2SO4and 30 % TBP/kerosene were found and are significantly lower than for TcO4-in the same solution.
authors.affiliation: Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland.
authors.forename: Maciej
authors.initials: M
authors.lastname: Chotkowski
keywords: Solvent extraction; Stability; Technetium (III,IV)