My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in SSSAJ

  1. Vol. 42 No. 6, p. 976-978
     
    Received: Aug 25, 1977
    Published: Nov, 1978


 View
 Download
 Alerts
 Permissions

doi:10.2136/sssaj1978.03615995004200060031x

Elemental Distribution in the Light Mineral Isolate of Soil Separates1

  1. L. R. Drees and
  2. L. P. Wilding2

Abstract

Abstract

The light mineral isolate (specific gravity < 2.89) was quantitatively separated from the 50–250µm, 20–50µm, and 5–20µm fractions of selected A and B soil horizons derived from loess and outwash deposits. Elemental Ti, Zr, Fe, K, and Ca were determined by X-ray spectroscopy both on total and light mineral isolates. More than 75% of Ti, Zr, Fe, and Ca occurs in the light mineral isolates of the 5–20µm fraction while the 50–250µm light mineral isolate contains 25 to 70% of these elements. With the exception of K, there is a progressive concentration of above elements as particle-size decreases. Essentially 100% of the K occurs in the light mineral isolate independent of particle-size. The concentration of Ti and Zr is greater than can be accounted for by mineral grain counts in the light isolate. Little or no co-association of Fe with Ti, Zr, Ca, or K could be established in secondary Fe-oxide grain coatings. It is concluded that much of the Ti, Zr, and Fe concentrated in the light mineral isolates occurs as micro-inclusions of accessory minerals within primary host minerals such as quartz and feldspars. Caution must be exercised in allocating elemental percentages of a given size fraction to specific detrital minerals.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America

Facebook   Twitter