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The effects of residual water and oxygen on the electrochemical processing step for the recovery of Cs + extracted into the hydrophobic ionic liquids, tri-1-butylmethylammonium bis((trifluoromethyl)sulfonyl)imide ( Bu 3 MeN + Tf 2 N − ) or N -methyl- N -propylpiperidinium bis((trifluoromethyl)sulfonyl)imide ( MePrPip + Tf 2 N − ) containing the lipophilic ionophore, calix[4]arene-bis( t -octylbenzo-crown-6) from simulated aqueous tank waste was investigated in the presence of residual water and oxygen. The electrochemical reduction of ionophore-bound Cs + at Hg electrodes is surprisingly tolerant of small amounts of water, but greatly affected by oxygen. However, sparging with dry N 2 lowers the residual water and oxygen content of the extraction solvent to the level where the reduction of Cs + at Hg is possible. Thus, the entire treatment cycle for the removal of Cs + from tank waste using a hydrophobic ionic liquid can be carried out in an open cell, provided that the cell is sparged with dry N 2 . MePrPip + Tf 2 N − + BOBCalixC 6 was found to be a better extraction solvent for Cs + than Bu 3 MeN + Tf 2 N − + BOBCalixC 6 , but the former solvent was unstable toward metallic Cs and/or Cs ( Hg ) x .
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Tsuda et al. (2006) studied this question.
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