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Interstratification in Vermiculite and Biotite Produced by Potassium Sorption: II. Evaluation by One-Dimensional Fourier Analysis¹

ABSTRACT

The one-dimensional Fourier analysis was applied to the determination of the distribution of sorbed potassium in initially magnesium- or sodium-saturated South African vermiculite and Bancroft biotite. It was concluded that while the type of interstratification produced through K sorption by vermiculite was not entirely regular, there was a definite trend in that direction. The biotite sample, on the other hand, apparently underwent zonal segregation upon K sorption when the complementary cation was Mg, whereas random interstratification seemed to be the case for the analogous Na system. Difficulties encountered in the use of this approach were discussed in terms of "skewness" and obscuration of X-ray diffraction peaks and the apparent intermixing of interstratification types obtained. Information gained from the Fourier analysis was used to speculate on reasons for the observed distribution of K in the materials.

¹ Paper No. 1779, Univ. of California, CRC-AES, Riverside. This research is from the doctoral dissertation of the senior author and was presented, in part, at the Western Soil Sci. Soc. meetings in Seattle, Wash., June 14, 1966.

Received for publication October 17, 1966. Accepted for publication February 13, 1967.