ROLE OF IRON-RICH GEORGIA ...
Published by Edwin Muchebve, Research Engineer at Taisei Corporation
ROLE OF IRON-RICH GEORGIA SOILS IN CONTROLLING NITRATE CONTAMINATION OF GROUND WATER
... nitrate reduction proceeds largely by oxidation of Fe2+ to an amorphous solid that subsequently recrystallizes to a meta-stable ferric hydroxide.
https://smartech.gatech.edu/bitstream/handle/1853/48494/Endale_6.10.33.PDF