Accession Number:

ADA190824

Title:

Underlying Basis for the Effects of Iron Oxidation State on Clay Swelling.

Descriptive Note:

Final rept. Sep 84-Sep 87,

Corporate Author:

ILLINOIS UNIV AT URBANA

Personal Author(s):

Report Date:

1988-01-12

Pagination or Media Count:

38.0

Abstract:

The effect of ironII in the crystal structure of the clay mineral nontronite on the fraction of clay layers that become completely collapsed was measured directly using a 2-ethoxyethanol surface area technique. Measurements showed that up to 28 of the clay layers became completely collapsed as a result of Fe reduction. X-ray diffraction results also showed that may layers become partially collapsed. Since the combined fraction of these types of layers increased with increasing FeII content in the clay and neither of these types of layers participates in the swelling process, one necessarily concludes that FeII alters swelling by decreasing the number of layers that are capable of full expansion in the presence of water.

Subject Categories:

  • Inorganic Chemistry
  • Geology, Geochemistry and Mineralogy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE