E. I. Denisov, E. V. Polyakov, E. D. Pуatygina, V. S. Semenishchev
{"title":"A Study of the Cobalt Speciation Using a Sorption Method","authors":"E. I. Denisov, E. V. Polyakov, E. D. Pуatygina, V. S. Semenishchev","doi":"10.1134/S1066362225010102","DOIUrl":null,"url":null,"abstract":"<p>The effect of the cobalt(II) speciation on its distribution parameters was studied for different types of sorbents. Inorganic sorbents based on hydrolyzable elements have shown the highest selectivity to Co in neutral and alkaline media (pH 7–10). The experiments on the cobalt sorption onto KU-2 strong acid cation-exchange resin at pH 3–5 have demonstrated the presence of Co<sup>2+</sup>, which shows high affinity for all the sorbents studied. In neutral and weakly alkaline media, the inorganic sorbents adsorbed Со(ОН)<sup>+</sup> and Со(ОН)<sub>2</sub><sup>0</sup> hydroxo complexes due to heterogeneous ion-exchange reaction (surface complex formation). The appearance of the <i>S</i>–pH dependences for the inorganic sorbents suggests higher stability of cobalt hydroxo complexes at microconcentrations as compared to the published data. In the whole pH range studied, cobalt(II) showed a behavior of an inert sorbate with all the inorganic sorbents studied.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"67 1","pages":"72 - 81"},"PeriodicalIF":1.0000,"publicationDate":"2025-04-05","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/S1066362225010102","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
The effect of the cobalt(II) speciation on its distribution parameters was studied for different types of sorbents. Inorganic sorbents based on hydrolyzable elements have shown the highest selectivity to Co in neutral and alkaline media (pH 7–10). The experiments on the cobalt sorption onto KU-2 strong acid cation-exchange resin at pH 3–5 have demonstrated the presence of Co2+, which shows high affinity for all the sorbents studied. In neutral and weakly alkaline media, the inorganic sorbents adsorbed Со(ОН)+ and Со(ОН)20 hydroxo complexes due to heterogeneous ion-exchange reaction (surface complex formation). The appearance of the S–pH dependences for the inorganic sorbents suggests higher stability of cobalt hydroxo complexes at microconcentrations as compared to the published data. In the whole pH range studied, cobalt(II) showed a behavior of an inert sorbate with all the inorganic sorbents studied.
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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