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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), TcO 2+ and [Tc 2 O 2 ] 3+ species with absorption bands at 420-450, 400, and 502 nm, respectively, were detected as products of pertechnetates electroreduction. The distribution ratios of 99 Tc with lower than +VII oxidation state ionic species between 4 M H 2 SO 4 and 30 % TBP/kerosene were found and are significantly lower than for TcO 4  - in the same solution.

Extraction of moderate oxidation state technetium species between 30 % tri-n-butyl phosphate and H2SO4/HNO3