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Chemical Extraction of Potassium from Soils and Micaceous Minerals With Solutions Containing Sodium Tetraphenylboron: II. Biotite
Author(s) -
Scott A. D.,
Reed M. G.
Publication year - 1962
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1962.03615995002600010011x
Subject(s) - biotite , vermiculite , potassium , chemistry , extraction (chemistry) , sodium , dehydration , boiling , endothermic process , nuclear chemistry , mineralogy , analytical chemistry (journal) , chromatography , materials science , metallurgy , adsorption , biochemistry , quartz , organic chemistry , composite material
Biotite samples were treated with NaCl‐NaBPh 4 solutions and various methods of separating the precipitated K from the resulting mixture were evaluated. As a result, a boiling NH 4 Cl solution method was adopted for K extraction experiments with small samples and a foaming method was used in the preparation of a large sample of degraded biotite for mineral property studies. Most of the K in biotite was easily extracted by placing the biotite in 1 N NaCl‐0.067 N NaBPh 4 solutions that also contained EDTA. The rate of K removal, however, varied with the size of the particles. In the case of < 50µ biotite, K was removed at an average rate of 1.6 mg. per 100 g. per minute for 3 days. The K in vermiculite particles of the same size was removed even faster. Na‐degraded biotite that contained only 3.9 me. K per 100 g. had an expanding structure. With water and glycerol treatment, however, expansion was limited to about 5 Å. Air‐dry, water‐treated samples had a basal spacing of 12.3 Å. corresponding to 1 layer of water. The loss of this interlayer water resulted in an endothermic peak at 135° C. in the differential thermal curve of this sample.