Spectrophotometric study of rare-earth element complexation in alkaline and near-neutral solutions |
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| Authors: | S A Stepanchikova R P Biteikina |
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| Institution: | 1. Institute of Geology and Mineralogy, Siberian Division, Russian Academy of Sciences, Novosibirsk, Russia
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| Abstract: | The hydrolytic behavior of La, Nd, Eu, Gd, Ho, and Tm in KOH solutions was studied at 25°C and a saturated vapor pressure using spectrophotometry with m-cresol purple and 2-naphthol as pH indicators. It was found that freshly prepared solutions of MCl3 (M = La, Nd, Eu, Gd, Ho, and Tm) at pH 6.0–10.1 contain the ions M3+, M(OH)2+, M(OH) 2 + , and M(OH) 3 0 , for Ho and Tm, the complex anions M(OH) 4 ? . were also detected. The formation constants of the hydroxide complexes a ionic strengths I = 0 were obtained as the parameters of linear regression equations that characterize the spectra of the indicators in the solutions under study. |
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