{"title":"Extraction of Ytterbium from Nitric Acid Solutions with Solutions of 2-Ethylhexyl Hydrogen 2-Ethylhexylphosphonate in Hexane","authors":"K. S. Bobrovskaya, R. A. Kuznetsov","doi":"10.1134/S1066362224060079","DOIUrl":null,"url":null,"abstract":"<p>The extraction of ytterbium from nitric acid solutions with solutions of 2-ethylhexyl hydrogen 2-ethylhexylphosphonate (HEH[EHP]) in hexane was studied. The HEH[EHP] concentration was varied from 0.5 to 2.0 M; acidity, from 0.1 to 2.0 M; and lanthanide concentration, from 0.1 to 5 g/L. The dependences of the ytterbium distribution ratio on the solution acidity are described by equations of the type log <i>D = a </i>log[H<sup>+</sup>] + <i>b</i>, where the coefficient <i>a</i> depends on the extractant and lanthanide concentrations and varies from –1.26 to –3.0. Its variation is probably caused by the occurrence of the extraction by both cation-exchange and solvation mechanism. The model describing the dependence of the ytterbium distribution ratio on its concentration in the aqueous phase at different concentrations of the extractant and acid was suggested. The data predicted by the model reasonably agree with the experimental data.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"66 6","pages":"835 - 845"},"PeriodicalIF":0.9000,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Radiochemistry","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.1134/S1066362224060079","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
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Abstract
The extraction of ytterbium from nitric acid solutions with solutions of 2-ethylhexyl hydrogen 2-ethylhexylphosphonate (HEH[EHP]) in hexane was studied. The HEH[EHP] concentration was varied from 0.5 to 2.0 M; acidity, from 0.1 to 2.0 M; and lanthanide concentration, from 0.1 to 5 g/L. The dependences of the ytterbium distribution ratio on the solution acidity are described by equations of the type log D = a log[H+] + b, where the coefficient a depends on the extractant and lanthanide concentrations and varies from –1.26 to –3.0. Its variation is probably caused by the occurrence of the extraction by both cation-exchange and solvation mechanism. The model describing the dependence of the ytterbium distribution ratio on its concentration in the aqueous phase at different concentrations of the extractant and acid was suggested. The data predicted by the model reasonably agree with the experimental data.
期刊介绍：
Radiochemistry is a journal that covers the theoretical and applied aspects of radiochemistry, including basic nuclear physical properties of radionuclides; chemistry of radioactive elements and their compounds; the occurrence and behavior of natural and artificial radionuclides in the environment; nuclear fuel cycle; radiochemical analysis methods and devices; production and isolation of radionuclides, synthesis of labeled compounds, new applications of radioactive tracers; radiochemical aspects of nuclear medicine; radiation chemistry and after-effects of nuclear transformations.
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