TECHNETIUM ATTENUATION IN THE VADOSE ZONE: ROLE OF MINERAL INTERACTIONS

Hess, Nancy J. ; Krupka, Kenneth M.

Pacific Northwest National Laboratory (U.S.)

关键词: Attenuation;    Sediments;    37 Inorganic, Organic, Physical And Analytical Chemistry;    Technetium;    Stability;   

DOI  :  10.2172/833641
RP-ID  :  EMSP-70177
RP-ID  :  833641

美国|英语

来源: UNT Digital Library

【 摘 要 】

The research objective was to provide fundamental information on surface-mediated reduction/precipitation reactions of Tc on Fe{sup II}-containing mineral surfaces and the stability of those precipitates under conditions relevant to the vadose zone at the Hanford Site. Our strategy was to investigate (1) Tc attenuation in Hanford Site sediments, (2) surface-mediated reduction of Tc{sup VII} on Fe{sup II}-containing minerals, and (3) the stability of the precipitated Tc{sup IV} solids. This information provides crucial support for the development of models of Tc mobility in the vadose zone. The methods used and results generated in these three research efforts are presented below.