Abstract
The speciation of Cr(III) radionuclides in solutions within the concentration range 10−6–10−2 M at pH 1–12 was studied. Adsorption on the glass surface, ion exchange, migration in the electric field, centrifugation, dialysis, and ultrafiltration were used. It was found that, at a concentration of 10−6 M at pH 1.0–4.4, Cr(III) exists in the solution as a monomeric species, and at pH > 4 it exhibits colloidal properties. At pH 1.0–3.4, Cr(III) exists in form of hydrated cations Cr(H2O) 63+ . At pH > 3.4, they are hydrolysed with formation of mononuclear hydroxo complexes Cr(OH)2+ [K h (3.35 ⊥ 0.15) × 10−5]. At the Cr(III) concentration exceeding 1 × 10−4 M, binuclear hydroxo complexes Cr2(OH)q are formed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Starik, I.E., Osnovy radiokhimii (Foundations of Radiochemistry), Moscow: Nauka, 1972.
Charlot, G., Les methods de la chimie analytique. Analyse quantitative minerale, Paris: Masson, 1961, 4th ed.
Schläfer, H.L., Komplexbildung in Lösung. Methoden zur Bestimmung der Zusammensetzung und der Stabilitätskonstante gelöster Komplexverbindungen, Berlin: Springer, 1961.
Kozhevnikova, G.V., Burkov, K.A., Lilich, L.S., and Myund, L.A., Zh. Obshch. Khim., 1987, vol. 57, no. 9, p. 2092.
Slobodov, A.A., Kritskii, A.V., Zarembo, V.I., and Puchkov, L.V., Probl. Sovrem. Khim. Koord. Soedin., 1993, no. 11, p. 128.
Zhao, Z., Rush, J.D., Holeman, J., and Bielski, B.H.J., Radiat. Phys. Chem., 1995, vol. 45, no. 2, pp. 257.
Croup, S.J. and Swedder, T.J., Inorg. Chem., 1994, vol. 33, no. 3, p. 465.
Kopylovich, M.H., Karabach, E.Yu., Kirillov, A.I., and Baev, A.K., Izv. Vysshch. Uchebn. Zaved., Khim. Khim. Tekhnol., 2003, vol. 46, no. 5, p. 9.
Baes, C.F. and Mesmer, R.E., Jr., The Hydrolysis of Cations, Malabar, FL: Krieger, 1986.
Davydov, Yu.P., Sostoyanie radionuklidov v rastvorakh (The State of Radionuclides in Solutions), Minsk: Nauka i Tekhnika, 1978.
Yatsimirskii, K.B. and Vasil’eva, V.P., Konstanty nestoikosti kompleksnykh soedinenii (Instability Constants of Complex Compounds), Moscow: Akad. Nauk SSSR, 1959.
Author information
Authors and Affiliations
Additional information
Original Russian Text © Yu.P. Davydov, N.I. Voronik, D.Yu. Davydov, A.S. Titov, 2006, published in Radiokhimiya, 2006, Vol. 48, No. 4, pp. 327–330.