• R K Malhotra

      Articles written in Journal of Chemical Sciences

    • Synergism in the extraction of uranium in presence of antipyrine

      R K Malhotra M Sudersanan A K Sundaram

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      Synergism in the extraction of uranium (VI) has been studied in the presence of a mixture of antipyrine and β-diketones like benzoyltrifluoroacetone, trifluoroacetylacetone and furoyltrifluoroacetone. The nature of the extracted species has been ascertained from the variation of logD with pH and the concentrations of the extractants. The equilibrium constants for the synergistic species have been evaluated taking into account the protonation and partition coefficient of antipyrine.

    • Synergism in the extraction of uranium (VI) by a mixture of oxine and β-diketones

      R K Malhotra M Sudersanan A K Sundaram

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      Extraction of uranium (VI) in presence of a mixture of oxine and β-diketones,viz, benzoyltrifluoroacetone, trifluoroacetylacetone, thenoyltrifluoroacetone and furoyltrifluoroacetone was studied. Extraction was found to be higher than that for oxine or β-diketone alone and the loss of uranium due to precipitation by oxine was eliminated completely. The synergistic species was found to be a mixed chelate and the nature of the species and equilibrium constant were evaluated. A correlation between the two phase stability constants and dissociation constants and partition coefficients of the β-diketones was also established.

    • Synergism in the extraction of lanthanides, copper and thorium in presence ofhtta and antipyrine

      R K Malhotra M Sudersanan

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      Synergism in the extraction of lanthanum, europium, lutetium, copper and thorium has been studied using a mixture ofhtta and 2,3-dimethyl, 1-phenyl pyrazol-5-one (antipyrine). Synergism was observed in all the cases except copper. The nature of extracted species has been determined on the basis of log-log plots and the equilibrium constants for the adducts have been evaluated. Antipyrine has been found to be a good donor comparable in strength to other alkylphosphorus donors.

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