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The separation of thorium, lanthanum and europium ions has been improved by acidic extractant bis(2-ethylhexyl)phosphoric acid (DEHPA) in cyclohexane using 2-nitrobenzo-18-crown-6 (NB18C6) as a selective masking agent. The presence of NB18C6 shifts the extraction curve of lanthanide ions versus pH towards higher pH region. NB18C6 was efficient masking agent towards lanthanide ions and a better separation...
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