A study of the Arrhenius behavior of the co-precipitation of radium, barium and strontium sulfate
Artikel i vetenskaplig tidskrift, 2013

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.

Radium

Co-precipitation

Strontium

water

Barium

Kinetics

solubility

Arrhenius

transport

Författare

Hanna Hedström

Chalmers, Kemi- och bioteknik, Industriell materialåtervinning

Chalmers, Kemi- och bioteknik, Kärnkemi

Henrik Ramebäck

Chalmers, Kemi- och bioteknik, Kärnkemi

Christian Ekberg

Chalmers, Kemi- och bioteknik, Kärnkemi

Journal of Radioanalytical and Nuclear Chemistry

0236-5731 (ISSN) 1588-2780 (eISSN)

Vol. 298 847-852

Ämneskategorier

Kemi

DOI

10.1007/s10967-013-2431-0