Publication details

Determination of pore water composition during long term interaction of bentonite substrates with water media: Comparative study



Year of publication 2013
Type Article in Periodical
Magazine / Source Applied Clay Science
MU Faculty or unit

Faculty of Science

Web article fulltext
Field Geochemistry
Keywords Bentonite; Pore water extraction; Mock-Up-Cz experiment; Centrifugation; Leaching
Description This paper reports validation results of two frequently used extraction methods centrifugation and leaching for determination of bentonite porewater chemistry. Three types of bentonite materials were used in our study. All the bentonite samples were placed into pressure vessels and interacted with natural water during a one-year experiment. Free water, obtained during these interactions, was used as a comparative pore water composition for both of the extraction methods. Concentrations of Mg2+, Ca2+, K+ and Na+ in water were determined. Centrifugation could be generally considered as a more suitable method because of the smaller differences between free water composition and concentrations obtained from extracted pore water compared to the leaching method. However, actual differences depend on the type of bentonite and on the composition of the water media. In some cases, the leaching method yields better results. Leaching usually leads to higher concentrations of alkali metals and lower concentrations of alkaline earth metals. This indicates that bentonite substrates are sensitive to the change of external conditions and quickly interact with the water media.
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