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Various  β -diketones   viz.   acetylacetone (AA), trifluoroacetylacetone (TFA), hexafluoroacetylacetone (HFA), thenoyltrifluoroacetylacetone (TTA) and heptafluorobutanoylpivaroylmethane (FOD) were evaluated as chelating agents for the supercritical fluid extraction of thorium from tissue paper matrix.   In-situ   chelation mode was found to be more effective than online chelation mode. A combination of tributyl phosphate (TBP) and  β -diketones further enhanced the extraction efficiency. The extraction efficiency trend observed in all the cases was: TTA&gt;FOD&gt;HFA&gt;TFA&gt;AA. A correlation was observed between extraction efficiency and degree of fluorination in the side arms of  β -diketones. This could be attributed to the fact that in supercritical CO 2 , higher fluorination results in higher percentage of enol content, greater dissociation into enolate ion and higher solubility and stability of  β -diketones as well as of Th- β -diketone chelates. Highest extraction efficiency with TTA was probably due to the presence of aromatic thenoyl group. The spectra of the extracted Th-chelates displayed peaks in the visible region, which shifted towards UV region with increasing fluorination. In the Th-TTA chelate spectrum, red shift was observed.

Supercritical fluid extraction of thorium from tissue paper matrix employing β-diketones