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• W2019417654 abstract "The solvent extraction of europium(III) from nitrate medium (0.1 M or 1 M) with acidic chelating extractants HL in chloroform, at 25 °C, has been studied. The extractants are either 3-phenyl-4-acylisoxazol-5-ones (acyl = benzoyl, “HPBI”, and p-tert-butylbenzoyl, “HPtbBI”), or substituted 4-acyl-5-hydroxypyrazoles 1-(p-nitro-phenyl)-3-phenyl-4-lauroyl-5-hydroxypyrazole, “HNPPLP”, and 1-phenyl-3-methyl-4-(p-tert-butylbenzoyl)-5-hydroxy-pyrazole, “HPMtbBP”, of various acidities. In all cases europium is extracted by cation exchange as EuL3,org. Because of their higher acidity, extractions performed with 4-acylisoxazol-5-ones occur at lower pH range than with 4-acylpyrazol-5-ones. The order of extraction efficiency is: HPMtbBP (pKa = 4.1) < HNPPLP (pKa = 3.2) < HPtbBI (pKa = 1.3) < HPBI (pKa = 1.2). The nature of the cation of the inorganic salt used to fix the ionic strength has no effect on the extraction. Due to the competitive complexation of Eu3+ by NO3− in the aqueous phase, the extraction from nitrate medium is less efficient than from perchlorate medium: the order of extraction is NaNO3 ≈ KNO3 ≈ LiNO3 < NaClO4. Extraction was also studied in other diluents and increased in the order: chloroform < 1,2-dichloroethane ≤ benzene ≈ toluene ≈ hexane. The same order was observed for europium extraction with several other β-diketones. On the basis of values found in literature, trends of extraction of europium with β-diketones in several diluents are proposed." @default.
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• W2019417654 date "2006-07-01" @default.
• W2019417654 modified "2023-10-16" @default.
• W2019417654 title "Solvent extraction of europium(III) from nitrate medium with 4-acyl-isoxazol-5-ones and 4-acyl-5-hydroxy-pyrazoles. Effect of salts and diluents" @default.
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• W2019417654 doi "https://doi.org/10.1016/j.hydromet.2006.04.004" @default.
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