I stored some clay rock samples in a diluted salt solution (c=2,5 g NaCl/l). The duration of the storage is around two to three months. Is there a possibility that Na+ from the salt solution replaces other ions in the clay minerals? If yes, what cations are exchanged in what clay mineral and how high is the possibility this process if you consider that the salt solution is strongly diluted (c=2,5 g NaCl/l)? A literature tip is also welcome.
Sehr geehrter Herr Kollege Ungewitter,
it is well known that charged 2 : 1 layer silicates biotite-group clay minerals have monovalent Na as interlayers such as paragonite. Using Ba chloride and ammonium acetate in the course of the application the CEC (cation exchange capacity) method among other bi and monovalent elements Na may be exchanged. Also the texture of micropores plays a role- see bentonite research and Ca -Na accommodation. For literature see also Klinkenberg (2008). My piece of advice, contact the clay minerals working groups in Greifswald, KIT (Karlsruhe)……there you will find experts on the matter which can help you further on.
Mit Glückauf !
H. G. Dill
In such diluted NaCl solution, Na may not replace any substantial amount of interlayer cations of 2:1 layer silicate minerals. Clays are generally preserved in Na form after removing excess chloride. You may refer to the following publication.
Jackson, M. L., Soil Chemical Analysis – Advanced Course, University
of Wisconsin, Madison, USA (Published by the author),
1979, 2nd edn.
I suggest that you check:
https://www.researchgate.net/post/How-to-calculate-cation-exchange-capacity-of-clay-soil
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