Alteration and dissolution of Na-montmorillonite in simulated groundwaters

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

1 Citation (Scopus)

Abstract

This study aims at gaining a better understanding of the behaviour of montmorillonite in contact with different ground waters; alteration of montmorillonite and possible formation of secondary minerals. Batch experiments were conducted with purified Swy-2 montmorillonite in simulated fresh (I=0.05 M, pH 8) and saline (I=0.1 M, pH 11) waters at 25 and 60°C in anaerobic (Ar(g)) conditions. The concentrations of Al, Fe; Mg and Si were analysed from ultra-filtered solution samples with HR-ICP-MS (High Resolution Inductively Coupled Plasma Mass Spectrometry). The amount of released Si depended strongly on the experimental conditions. The Si concentrations at 60°C in the saline and fresh waters showed a difference greater than an order of magnitude. The initial purified montmorillonite and the solid materials from experiments were analysed with XRD. The analysis indicated that the nature of smectite did not change, but the experimental conditions, more or less, modified the structure of montmorillonite, e.g., in fresh waters the XRD spectra showed peaks typical of mixed layer minerals, which can refer to the presence of either randomly ordered illite/smectite or randomly ordered collapsed smectite/hydrated smectite layers. The dissolution of montmorillonite was studied also by modelling with TOUGHREACT. The experimental and modelled results were compared revealing a need to develop the model e.g. in respect of the evolution of pH.
Original languageEnglish
Title of host publicationMRS Proceedings
Subtitle of host publicationSymposium NW – Scientific Basis for Nuclear Waste Management XXXV
PublisherMaterials research society
Pages329-334
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

montmorillonite
dissolution
smectite
groundwater
X-ray diffraction
secondary mineral
illite
water
mixed layer
mass spectrometry
experiment
plasma
mineral
modeling

Cite this

Myllykylä, E., Tanhua-Tyrkkö, M., & Bouchet, A. (2012). Alteration and dissolution of Na-montmorillonite in simulated groundwaters. In MRS Proceedings: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV (pp. 329-334). Materials research society. Materials Research Society MRS, Vol.. 1475 https://doi.org/10.1557/opl.2012.595
Myllykylä, Emmi ; Tanhua-Tyrkkö, Merja ; Bouchet, A. / Alteration and dissolution of Na-montmorillonite in simulated groundwaters. MRS Proceedings: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV. Materials research society, 2012. pp. 329-334 (Materials Research Society MRS, Vol. 1475).
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abstract = "This study aims at gaining a better understanding of the behaviour of montmorillonite in contact with different ground waters; alteration of montmorillonite and possible formation of secondary minerals. Batch experiments were conducted with purified Swy-2 montmorillonite in simulated fresh (I=0.05 M, pH 8) and saline (I=0.1 M, pH 11) waters at 25 and 60°C in anaerobic (Ar(g)) conditions. The concentrations of Al, Fe; Mg and Si were analysed from ultra-filtered solution samples with HR-ICP-MS (High Resolution Inductively Coupled Plasma Mass Spectrometry). The amount of released Si depended strongly on the experimental conditions. The Si concentrations at 60°C in the saline and fresh waters showed a difference greater than an order of magnitude. The initial purified montmorillonite and the solid materials from experiments were analysed with XRD. The analysis indicated that the nature of smectite did not change, but the experimental conditions, more or less, modified the structure of montmorillonite, e.g., in fresh waters the XRD spectra showed peaks typical of mixed layer minerals, which can refer to the presence of either randomly ordered illite/smectite or randomly ordered collapsed smectite/hydrated smectite layers. The dissolution of montmorillonite was studied also by modelling with TOUGHREACT. The experimental and modelled results were compared revealing a need to develop the model e.g. in respect of the evolution of pH.",
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Myllykylä, E, Tanhua-Tyrkkö, M & Bouchet, A 2012, Alteration and dissolution of Na-montmorillonite in simulated groundwaters. in MRS Proceedings: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV. Materials research society, Materials Research Society MRS, vol. 1475, pp. 329-334, MRS Spring Meeting, San Francisco, CA, United States, 9/04/12. https://doi.org/10.1557/opl.2012.595

Alteration and dissolution of Na-montmorillonite in simulated groundwaters. / Myllykylä, Emmi; Tanhua-Tyrkkö, Merja; Bouchet, A.

MRS Proceedings: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV. Materials research society, 2012. p. 329-334 (Materials Research Society MRS, Vol. 1475).

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

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N2 - This study aims at gaining a better understanding of the behaviour of montmorillonite in contact with different ground waters; alteration of montmorillonite and possible formation of secondary minerals. Batch experiments were conducted with purified Swy-2 montmorillonite in simulated fresh (I=0.05 M, pH 8) and saline (I=0.1 M, pH 11) waters at 25 and 60°C in anaerobic (Ar(g)) conditions. The concentrations of Al, Fe; Mg and Si were analysed from ultra-filtered solution samples with HR-ICP-MS (High Resolution Inductively Coupled Plasma Mass Spectrometry). The amount of released Si depended strongly on the experimental conditions. The Si concentrations at 60°C in the saline and fresh waters showed a difference greater than an order of magnitude. The initial purified montmorillonite and the solid materials from experiments were analysed with XRD. The analysis indicated that the nature of smectite did not change, but the experimental conditions, more or less, modified the structure of montmorillonite, e.g., in fresh waters the XRD spectra showed peaks typical of mixed layer minerals, which can refer to the presence of either randomly ordered illite/smectite or randomly ordered collapsed smectite/hydrated smectite layers. The dissolution of montmorillonite was studied also by modelling with TOUGHREACT. The experimental and modelled results were compared revealing a need to develop the model e.g. in respect of the evolution of pH.

AB - This study aims at gaining a better understanding of the behaviour of montmorillonite in contact with different ground waters; alteration of montmorillonite and possible formation of secondary minerals. Batch experiments were conducted with purified Swy-2 montmorillonite in simulated fresh (I=0.05 M, pH 8) and saline (I=0.1 M, pH 11) waters at 25 and 60°C in anaerobic (Ar(g)) conditions. The concentrations of Al, Fe; Mg and Si were analysed from ultra-filtered solution samples with HR-ICP-MS (High Resolution Inductively Coupled Plasma Mass Spectrometry). The amount of released Si depended strongly on the experimental conditions. The Si concentrations at 60°C in the saline and fresh waters showed a difference greater than an order of magnitude. The initial purified montmorillonite and the solid materials from experiments were analysed with XRD. The analysis indicated that the nature of smectite did not change, but the experimental conditions, more or less, modified the structure of montmorillonite, e.g., in fresh waters the XRD spectra showed peaks typical of mixed layer minerals, which can refer to the presence of either randomly ordered illite/smectite or randomly ordered collapsed smectite/hydrated smectite layers. The dissolution of montmorillonite was studied also by modelling with TOUGHREACT. The experimental and modelled results were compared revealing a need to develop the model e.g. in respect of the evolution of pH.

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M3 - Conference article in proceedings

SN - 978-1-6274-8264-6

T3 - Materials Research Society MRS

SP - 329

EP - 334

BT - MRS Proceedings

PB - Materials research society

ER -

Myllykylä E, Tanhua-Tyrkkö M, Bouchet A. Alteration and dissolution of Na-montmorillonite in simulated groundwaters. In MRS Proceedings: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV. Materials research society. 2012. p. 329-334. (Materials Research Society MRS, Vol. 1475). https://doi.org/10.1557/opl.2012.595