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Spectrophotometric study of rare-earth element complexation in alkaline and near-neutral solutions

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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) 03 , 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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Authors and Affiliations

  1. Institute of Geology and Mineralogy, Siberian Division, Russian Academy of Sciences, Novosibirsk, Russia

    S. A. Stepanchikova & R. P. Biteikina

Authors
  1. S. A. Stepanchikova
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  2. R. P. Biteikina
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Correspondence to S. A. Stepanchikova.

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Original Russian Text © S.A. Stepanchikova, R.P. Biteikina, 2011, published in Koordinatsionnaya Khimiya, 2011, Vol. 37, No. 1, pp. 64–72.

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Stepanchikova, S.A., Biteikina, R.P. Spectrophotometric study of rare-earth element complexation in alkaline and near-neutral solutions. Russ J Coord Chem 37, 64–71 (2011). https://doi.org/10.1134/S1070328411010143

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  • DOI: https://doi.org/10.1134/S1070328411010143

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