| Инд. авторы: | Stepanchikova S.A., Biteikina R.P., Shironosova G.P., Kolonin G.R. |
| Заглавие: | An experimental study of hydroxo complex formation in basic and near-neutral solutions of rare-earth elements and yttrium at 25 °C |
| Библ. ссылка: | Stepanchikova S.A., Biteikina R.P., Shironosova G.P., Kolonin G.R. An experimental study of hydroxo complex formation in basic and near-neutral solutions of rare-earth elements and yttrium at 25 °C // Russian Geology and Geophysics. - 2014. - Vol.55. - Iss. 8. - P.941-944. - ISSN 1068-7971. - EISSN 1878-030X. |
| Внешние системы: | DOI: 10.1016/j.rgg.2014.07.002; РИНЦ: 23968565; SCOPUS: 2-s2.0-84904651089; WoS: 000339259600002; |
| Реферат: | eng: We have studied the hydrolytic behavior of Y3+ and trivalent ions of rare earth elements in aqueous solutions at 25C. The stepwise stability constants of hydroxide complexes were measured by spectrophotometry, using m-cresol purple and 1-(2-pyridylazo)-2-naphthol as pH indicators at an ionic strength no more than 0.0005. The results showed that at pH ranging between 6.0 and 11.0 in freshly prepared solutions of REE trichlorides, lanthanides are presented as Ln3+, Ln(OH)2+, Ln(OH)2, and Ln(OH)3. The plots of the formation constants of +0 monohydroxo complexes of 4f n ions M3+ versus atomic number Z deviate from smooth ones and consist of four convex curves. This phenomenon is also observed in normalized spectra of REE concentrations in natural objects and is known as the tetrad effect. The obtained data give an insight into the relationship between REE complex formation and REE fractionation in geochemical processes and can be used for physicochemical modeling of geochemical systems. © 2014.
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| Ключевые слова: | rare earth element; physicochemical property; pH; hydrolysis; geochemical method; concentration (composition); complexation; aqueous solution; Tetrad effect; Rare-earth elements; Hydrolysis; Complex formation; yttrium; |
| Издано: | 2014 |
| Физ. характеристика: | с.941-944 |