Abstract
A solvent extraction separation of uranium, in the presence of thorium, cerium and lanthanides with a new calix[4]resorcinarene bearing eight hydroxamic acid groups (C4RAHA) is described. Quantitative extraction of uranium is possible in ethyl acetate solution of C4RAHA at pH 8.0. The λ max and molar absorptivity ( ɛ) for uranium is 356 nm and 8352 L mol −1 cm −1. The Binding ratio of uranium with C4RAHA as evaluated by Job’s method is 4:1. The system obeys Beer’s law over the range 0.075–6.0 μg ml −1 of uranium with Sandell sensitivity 0.0284 μg cm −2. A preconcentration factor of 142 was achieved by directly aspirating the extract for GF-AAS measurements. The two-phase stability constant evaluated at 25 °C for uranium is 15.91. The complexation is characterized by favorable enthalpy and entropy changes. A liquid membrane transport study of uranium was carried out from source to the receiving phase under controlled conditions and a mechanism of transport is proposed. Uranium has been determined in standard and environmental samples.
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