The most stable ionic form of Tc in aqueous solutions is the TcO« ion. Various analytical procedures were applied in order to determine the valency states of the technetium compounds existing under authentic oxidation-reduction conditions during different steps of reprocessing and waste treatment. Investigations include the formation of various valency states of technetium in the systems HN0 3 /HN0 2 , HN0 3 /ΝΗ 2 0Η/Ν 2 0", HN0 3 /HCH0, HNOj /HCOOH and HN0 3 /H 2 . It could be shown that a technetium release into the off-gas can be minimized by applying simple process precautions.
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