Ferrous Metals act as Sponge
Microbially produced ferrous iron may decrease technetium concentrations in groundwater
(PhysOrg.com) — The long-lasting radionuclide technetium is transported through the subsurface near former nuclear production and processing sites, moving toward rivers and lakes. But its journey can come to an abrupt end if it hits an area containing high levels of reduced iron generated by microbes.
Scientists from Pacific Northwest National Laboratory recently found that microbially generated iron creates significant roadblocks for the pollutant. They determined that in the presence of commonly occurring oxidized iron minerals, indirect technetium reduction by microbially generated ferrous iron, or Fe(II), may be favored over direct technetium reduction by bacteria, making the technetium as much as 10 times less soluble.
Technetium-99 (99Tc), a radioactive by-product of nuclear production and processing, has a half-life of 200,000 years. Its common oxidized form, Tc(VII)O4-, or pertechnetate, is highly mobile in subsurface sediments and groundwater. This makes it of concern at Department of Energy plutonium production sites such as the Hanford Site in Washington State, and others in Paducah, KY, and Portsmouth, OH
Basically what this means is Microbially produced ferrous iron may decrease technetium concentrations in groundwater. A new tool in the fight to save ground water from contamination.
Read more at Tim’s Scared Stiff
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