Сobalt-60 radionuclide speciation in boric acid solutions
https://doi.org/10.29235/1561-8331-2020-56-1-24-32
Abstract
In this work, the speciation of 60Co radionuclide in model solution of spent fuel pool coolant is studied by ultrafiltration and centrifugation. The effect of pH and composition of the solution on the 60Co radionuclide speciation is shown; the limitss in existence of ionic and non-ionic (pseudocolloidal) forms are defined. A great part of 60Co states at ionic form represented by hydrated cation of 60Co in the solutions of boric acid 20 g/L at 4–8 pH value. The size of non-ionic forms of 60Co in this pH range is 1–50 nm. Starting with pH 8, the соntent of non-ionic forms increases dramatically and reaches 100 % at pH value 10–11, which is due to formation of CoOH+ ions and their increased sorption activity at forming pseudocolloids. Introduction of iron (III) ions to the solution, which are precursors of corrosion products, shifts the formation of nonionic forms of 60Co to lower pH area.
Keywords
Supporting agencies: This work has been performed with the financial support of the National Academy of Sciences of Belarus (grant for scientific research by doctoral students, postgraduates and applicants of the National Academy of Sciences of Belarus, agreement No. 2017-26-008 of 03/04/2017).
About the Authors
A. M. Zarubo
Science institution «The Joint Institute of Power and Nuclear Research –Sosny» National Academy of Sciences of Belarus
Belarus
Belarus
Alexander M. Zarubo – Researcher
47/22, Prilesye district, Lugovaya Sloboda village council, Minsk district, 223063, Minsk region
A. V. Radkevich
Science institution «The Joint Institute of Power and Nuclear Research –Sosny» National Academy of Sciences of Belarus
Belarus
Belarus
Artem V. Radkevich – Researcher
47/22, Prilesye district, Lugovaya Sloboda village council, Minsk district, 223063, Minsk region
O. B. Korenkova
Science institution «The Joint Institute of Power and Nuclear Research –Sosny» National Academy of Sciences of Belarus
Belarus
Belarus
Olga B. Korenkova – Junior Researcher
47/22, Prilesye district, Lugovaya Sloboda village council, Minsk district, 223063, Minsk region
N. I. Voronik
Science institution «The Joint Institute of Power and Nuclear Research –Sosny» National Academy of Sciences of Belarus
Belarus
Belarus
Nadzey I. Voronic – Leading Researcher
47/22, Prilesye district, Lugovaya Sloboda village council, Minsk district, 223063, Minsk region
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