Chemical Extraction of Potassium from Soils and Micaceous Minerals With Solutions Containing Sodium Tetraphenylboron: III. Illite
- A. D. Scott and
- M. G. Reed
Grundite-illite was treated with NaBPh4 solutions at 25° C. for various periods of time to determine the amount of K that can be removed, the rate of K removal and the effect of this treatment on the properties of the mineral.
Only the first 30 me. K per 100 g. were removed from <20µ illite at a rate that was comparable to the 1.6 mg. K per 100 g. per minute observed with <50µ biotite. The rest of the K was removed at a progressively slower rate but it was possible to remove 74 me. per 100 g. (68% of the total) by extracting the illite for 63 days. During this period the amount of K removed was linearly related to the logarithm of the contact time.
The amount of NH4 adsorbed and fixed by moist NH4-saturated <2µ illite was increased by 62.4 me. and 35.2 me. per 100 g., respectively, when 69.1 me. K per 100 g. were removed. When the NH4-degraded illite was oven dried even more NH4 was fixed. There was no evidence of a change in the charge density of the illite when this much K was removed, but the lattice of the Na-degraded illite was largely expanded to 14 Å. by glycerol.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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