Chemical Extraction of Potassium from Soils and Micaceous Minerals with Solutions Containing Sodium Tetraphenylboron: IV. Muscovite

Abstract

Methods of extracting the interlayer K in micaceous minerals with NaTPB solutions were modified to maximize the extraction of K from muscovite. In the method adopted, 0.500‐g samples were placed in 10 ml of 2n NaCl‐0.2n NaTPB‐0.01m EDTA solution at 25C, and the precipitated K was separated with a boiling 0.5n NH4Cl solution that contained HgCl2. Even with this method, muscovite released its K much slower than did biotite. However, it was possible to remove 96% of the K in <10µ muscovite in 16 weeks. This was also the maximum amont of K that was extracted.

Potassium Release from Muscovite as Influenced by Particle Size

“…Reed and Scott (1966), therefore, observed with muscovite distinctly higher exchange rates from the < 10p. fraction than from the < 50/~ fraction.…”

Relation of Potassium Exchange and Fixation to Degree of Weathering and Organic Matter Content in Micaceous Clays of Podzol Soils

“…Total K of each fractionated and differently treated clay was determined using the HF-HCIO 4 decomposition method of Jackson (1958). Potassium was extracted at 25~ with NaTPB as described previously by Ross and Kodama (1970) using essentially the method of Reed and Scott (1966). Total and extracted K was determined by atomic absorption spectrophotometry (Ross and Kodama, 1970).…”

Differential Release of Potassium from Interstratified Mica Clay Minerals as Related to Probable Differences in Their Mica Layer Components

“…Thus the chemical structure formulae given in Table 1 are still valid for discussion of results from the fractionated samples. The method used for extracting potassium with NaTPB was essentially the same as that described by Reed and Scott (1966). Fifty mg samples were placed in 50 ml polyethylene centrifuge tubes and 5 mlofa 1 N NaCI-0.2 N NaTPB-0-01 M disodium dihydrogen EDTA solution were added to each sample.…”