Isotopic Exchange of Potassium in an Illite under Equilibrium Conditions1
- M. E. Sumner and
- G. H. Bolt2
The kinetics of K exchange in an illite were studied using K42. The influence of various pretreatments was investigated, and a comparison was made between exchange with K42 under equilibrium conditions during 1 week and repeated extraction with 0.5 N NH4NO3 and 0.5 N NaNO3. Except for the samples containing 0.5 N CaCl2 the K42 exchange appeared to be very fast and no further increase could be observed during shaking from 6 hours up to 1 week.
Prolonged pretreatment with 0.5 N CaCl2 apparently caused an opening up of the clay lattice. The 0.5 N NH4-extraction following this treatment always removed considerably more K than was exchangeable against K42 under equilibrium conditions.
On the other hand, extraction with 0.5 N NaNO3 removed even less than was exchangeable against K42, indicating that part of the exchangeable K was still in interlattice positions.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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