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A study of the Arrhenius behavior of the co-precipitation of radium, barium and strontium sulfate

Hanna Hedström (Institutionen för kemi- och bioteknik, Kärnkemi ; Institutionen för kemi- och bioteknik, Industriell materialåtervinning) ; Henrik Ramebäck (Institutionen för kemi- och bioteknik, Kärnkemi) ; Christian Ekberg (Institutionen för kemi- och bioteknik, Kärnkemi)
Journal of Radioanalytical and Nuclear Chemistry (0236-5731). Vol. 298 (2013), 2, p. 847-852.
[Artikel, refereegranskad vetenskaplig]

Co-precipitation of radium, barium and strontium is an important process in many contexts, such as uranium mining, oil extraction and in the safety assessment of a final repository for used nuclear fuel. Co-precipitation to a solid solution is possible since radium, barium and strontium act as chemical analogues. In this work the co-precipitation of radium, barium and strontium was studied and the kinetic behavior of the co-precipitation process was investigated. It was shown that radium, barium and strontium co-precipitate congruently and that the precipitation followed an Arrhenius behavior and the Arrhenius parameters for the systems was determined. When studying the differences of the Arrhenius constants by using a student t test (95 % confidence interval) it was observed that the only significant difference in the activation energy, E (a), is between radium and barium and between radium and strontium respectively, the pure strontium having the larger activation energy in comparison. This is most likely coupled to the metal ion size; since the hydration waters are more strongly bound, which leads to them having a slower exchange rate, which in turn effects the rate of co-precipitation to the metal these reactions will be slower.

Nyckelord: Radium, Barium, Strontium, Co-precipitation, Arrhenius, Kinetics, solubility, transport, water



Denna post skapades 2013-11-14. Senast ändrad 2016-07-04.
CPL Pubid: 186682

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Kärnkemi (2005-2014)
Institutionen för kemi- och bioteknik, Industriell materialåtervinning (2007-2014)

Ämnesområden

Kemi

Chalmers infrastruktur