Date of Award

Summer 8-18-2010

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Geosciences

First Advisor

W. Crawford Elliott

Second Advisor

J. Marion Wampler

Third Advisor

Seth E. Rose

Fourth Advisor

Daniel M. Deocampo

Fifth Advisor

Eirik J. Krogstad

Abstract

Understanding how natural Cs, Rb, and K have been redistributed in Savannah River Site (SRS) soils during pedogenesis is important to understanding how radiocesium released to the soils will behave over the long term. In this effort, it is important to distinguish K that has participated in mineral-water reactions from that still residing in primary silicate structures, particularly in the clay fraction. The impact of different degrees of acid extraction on K and radiogenic Ar in bulk soil and in clay from five SRS soil samples has been determined. Strong treatment (50% HNO3, three hours, 100°C) releases K from primary minerals, as shown also by a concomitant release of radiogenic Ar, but a more moderate treatment (6% HNO3, three hours, 80°C) does not release K. K in the clay fraction is mostly nonexchangeable K in remnants of primary mica, and clay K-Ar age values near 300 Ma indicate the mica originated in the Appalachian mountain belt.

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