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Technetium-99, in the form of Tc(VII), is one of major problems in the management and disposal of nuclear waste in view of its long half-life in combination with high geochemical mobility. Solvent extraction is an important separation technique to remove  99 Tc from liquid nuclear waste streams. 2-nitrophenyl octyl ether (NPOE) shows high extraction ability for Tc(VII) from water and NaOH solutions (&gt;99.5%) in spite of the lack of donating atoms. Upon extraction from alkaline solutions, TcO 4  -  associates with NPOE molecules in 1:1 stoichiometry where the co-extracted cation is expected to play an important role in the extraction mechanism. At pH &gt; 4 the Tc(VII) distribution is relatively insensitive towards changes in pH, while at decreasing pH (&lt;4) the distribution ratio decreases sharply. The strong dependency of the Tc(VII) distribution on the acidity is very useful for developing efficient extraction-stripping systems. This study showed that NPOE is an excellent compound for the removal of technetium from alkaline nuclear wastes.

Extraction of heptavalent technetium from nuclear waste streams with 2-nitrophenyl octyl ether