Na/Ca selectivity coefficients of montmorillonite in perchlorate solution at different temperatures

Aku Itälä, Arto Muurinen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

The Finnish spent nuclear fuel disposal is based on the Swedish KBS-3 concept in crystalline bedrock. The concept aims at long-term isolation and containment of spent fuel in copper canisters surrounded by bentonite buffer which mostly consists of montmorillonite. For the long-term modelling of the chemical processes in the buffer, the cation-exchange selectivity coefficients have to be known at different temperatures. In this work, the cation-exchange selectivity coefficients and cation-exchange isotherms were determined in batch experiments for montmorillonite at three different temperatures (25 oC, 50 oC and 75 oC). Five different ratios of NaClO4/Ca(ClO4)2 were used in the experimental solutions. After equilibration the solution and montmorillonite were separated and the solution analysed to get the desired exchange parameters. The experiments were modelled with a computational model capable of taking into account the physicochemical processes that take place in the experiment
Original languageEnglish
Title of host publicationMRS Proceedings
Subtitle of host publicationSymposium NW – Scientific Basis for Nuclear Waste Management XXXV
PublisherMaterials research society
Pages335-340
ISBN (Print)978-1-6274-8264-6
DOIs
Publication statusPublished - 2012
MoE publication typeA4 Article in a conference publication
EventMRS Spring Meeting - San Francisco, CA, United States
Duration: 9 Apr 201213 Apr 2012

Publication series

SeriesMaterials Research Society MRS
Volume1475

Conference

ConferenceMRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period9/04/1213/04/12

Fingerprint

Bentonite
Cations
Spent fuels
Buffers
Temperature
Experiments
Nuclear fuels
Isotherms
Copper
Ion exchange
Crystalline materials
perchlorate

Cite this

Itälä, A., & Muurinen, A. (2012). Na/Ca selectivity coefficients of montmorillonite in perchlorate solution at different temperatures. In MRS Proceedings: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV (pp. 335-340). Materials research society. Materials Research Society MRS, Vol.. 1475 https://doi.org/10.1557/opl.2012.596
Itälä, Aku ; Muurinen, Arto. / Na/Ca selectivity coefficients of montmorillonite in perchlorate solution at different temperatures. MRS Proceedings: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV. Materials research society, 2012. pp. 335-340 (Materials Research Society MRS, Vol. 1475).
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abstract = "The Finnish spent nuclear fuel disposal is based on the Swedish KBS-3 concept in crystalline bedrock. The concept aims at long-term isolation and containment of spent fuel in copper canisters surrounded by bentonite buffer which mostly consists of montmorillonite. For the long-term modelling of the chemical processes in the buffer, the cation-exchange selectivity coefficients have to be known at different temperatures. In this work, the cation-exchange selectivity coefficients and cation-exchange isotherms were determined in batch experiments for montmorillonite at three different temperatures (25 oC, 50 oC and 75 oC). Five different ratios of NaClO4/Ca(ClO4)2 were used in the experimental solutions. After equilibration the solution and montmorillonite were separated and the solution analysed to get the desired exchange parameters. The experiments were modelled with a computational model capable of taking into account the physicochemical processes that take place in the experiment",
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Itälä, A & Muurinen, A 2012, Na/Ca selectivity coefficients of montmorillonite in perchlorate solution at different temperatures. in MRS Proceedings: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV. Materials research society, Materials Research Society MRS, vol. 1475, pp. 335-340, MRS Spring Meeting, San Francisco, CA, United States, 9/04/12. https://doi.org/10.1557/opl.2012.596

Na/Ca selectivity coefficients of montmorillonite in perchlorate solution at different temperatures. / Itälä, Aku; Muurinen, Arto.

MRS Proceedings: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV. Materials research society, 2012. p. 335-340 (Materials Research Society MRS, Vol. 1475).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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Itälä A, Muurinen A. Na/Ca selectivity coefficients of montmorillonite in perchlorate solution at different temperatures. In MRS Proceedings: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV. Materials research society. 2012. p. 335-340. (Materials Research Society MRS, Vol. 1475). https://doi.org/10.1557/opl.2012.596