Abstract
A scheme was suggested for Am(OH)4 isolation by treatment of Am(OH)3 suspension in 0.1–1.0 M NaOH with ozone (3.5–5 vol %)-oxygen mixture (4–5 l h−1 flow rate) at 20°C for 40 min, followed by ultrasonic treatment of the resulting Am(VI) (44 kHz, 1 W cm−3) for 45 min. The separated precipitate of Am(III) hydroxy peroxide was treated with 1–2 mlof 7–10 M NaOH to form Am(OH)4. Mixing suspensions of equivalent amounts of Am(III) and Am(V) hydroxides in NaOH also gives Am(IV) hydroxide in a >98% yield. The reproportionation Am(III) + Am(V) = 2Am(IV) in 1 M NaOH starts on heating above 70°C, whereas at NaOH concentration higher than 7 M it is completed even at room temperature. The reaction of Am(III) with Am(VI) in alkaline solutions, Am(VI) + 2Am(III) → 3Am(IV), occurs during mixing the reactants. The equilibrium reaction of Am(OH)3 with [Fe(CN)6]3− in alkaline solutions was studied. It was shown that increasing the alkali concentration to 2 M NaOH promotes formation of Am(OH)4. At further increase in the alkali concentration, Am(V) is formed.
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REFERENCES
The Actinide Elements, Seaborg, G.T., and Katz, J.J., Eds., New York: McGraw-Hill, 1954. Translated under the title Actinidy, Moscow: Inostrannaya Literatura, 1955, p. 417.
Myasoedov, B.F., Vopr. Radiats. Bezop., 1997, no. 1, pp. 3–18.
Nikolaevskii, V.B., Shilov, V.P., Krot, N.N., and Peretrukhin, V.F., Radiokhimiya, 1975, vol. 17, no.3, pp. 426–430.
Latimer, W.M., Oxidation States of the Elements and Their Potentials in Aqueous Solutions, New York: Prentice-Hall, 1966.
Pourbaix M., Atlas of Electrochemical Equipment, New York, 1966.
Nikolaevskii, V.B., Shilov, V.P., and Krot, N.N., Radiokhimiya, 1974, vol. 16, no.1, pp. 122–123.
Peretrukhin, V.F., Radiokhimiya, 1974, vol. 16, no.6, pp. 833–836.
Borin, L.L. and Karelin, E.A., Termodinamika okislitel’no-vosstanovitel’nykh reaktsii aktinidov v rastvorakh (Thermodynamics of Actinide Redox Reactions in Solutions), Moscow: Atomizdat, 1977.
Shilov, V.P. and Yusov, A.B., Usp. Khim., 2002, vol. 71, no.6, pp. 533–558.
Penneman, R.A., Coleman, J.S., and Keenan, T.K., J. Inorg. Nucl. Chem., 1961, vol. 17, no.1, pp. 138–142.
Kulyako, Yu.M., Trofimov, T.I., Malikov, D.A., et al., Radiokhimiya, 1993, vol. 35, no.5, pp. 68–73.
Margulis, M.A., Zvukokhimicheskie reaktsii i sonolyuminestsentsiya (Sonochemical Reactions and Sonoluminescence), Moscow: Khimiya, 1986.
Bessonov, A.A., Anan’ev, A.V., and Krot, N.N., Radiokhimiya, 1993, vol. 35, no.1, pp. 38–42.
Bourges, J.Y., Guillaume, B., Koehly, G., et al., Inorg. Chem., 1983, vol. 22, pp. 1179–1184.
Mefod’eva, M.P. and Krot, N.N., Soedineniya transuranovykh elementov (Compounds of Transuranium Elements), Moscow: Nauka, 1987, p. 243.
Buijs, K. and Louwrier, K.P., J. Inorg. Nucl. Chem., 1966, vol. 28, no.10, p. 2463.
Schwartz, H. and Bielski, B.H.J., J. Phys. Chem., 1986, vol. 90, pp. 1445–1448.
Zaitseva, V.P., Radiokhimiya, 1971, vol. 13, no.6, pp. 658–659.
Bielski, B.H. and Thomas, M.J., J. Am. Chem. Soc., 1987, vol. 109, no.25, pp. 7761–7764.
Tananaev, I.G., Radiokhimiya, 1990, vol. 32, no.5, pp. 53–57.
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Translated from Radiokhimiya, Vol. 47, No. 3, 2005, pp. 234–238.
Original Russian Text Copyright © 2005 by Nikonov, Gogolev, Tananaev, Myasoedov, Clark.
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Nikonov, M.V., Gogolev, A.V., Tananaev, I.G. et al. Redox Behavior of Am(IV) and Methods of Its Preparation in Alkaline Media. Radiochemistry 47, 258–262 (2005). https://doi.org/10.1007/s11137-005-0083-9
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DOI: https://doi.org/10.1007/s11137-005-0083-9