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- W2061703123 abstract "The selective extraction of uranium by a macrocyclic molecule, 5,11,17,23,29,35-hexa-tert-butyl-37,39,41-tri(carboxymethyl)-38,40,42-trimethoxy-calix[6]-arene has been studied in a two-phase solvent-extraction system. The first part of this study concerns the determination of extraction mechanism. The variation of the extraction parameters, performed for two different ionic strengths (I=0.1 and I=3), allows to propose an extraction scheme. The second part of this work concerns the selectivity of calix[6]arene towards uranium. Some competing metal cations present in urine have been taken into account. In the aqueous phase (spiked with 230U), divalent metals such as Zn2+, Cu2+, Mg2+, Ca2+ were added. The results show that the uranium extraction is independent of the cation concentration, whatever the pH and the ionic strength are. The competition between the chosen calix[6]arene and other complexing anions, such as phosphate or sulphate, has been investigated. The results indicate that the uranium–calixarene extraction constant is higher than the uranium–anion complexation constant." @default.
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- W2061703123 date "1998-06-01" @default.
- W2061703123 modified "2023-09-30" @default.
- W2061703123 title "Solvent extraction of U(VI) from media containing competing anions and metal cations by a calix[6]arene bearing carboxy groups" @default.
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- W2061703123 doi "https://doi.org/10.1016/s0925-8388(98)00206-0" @default.
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