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Full-Text Articles in Geological Engineering
Phosphate As A Control On Schwertmannite Stability, Iron Mineralogy And Anaerobic Biogeochemistry In Acid-Sulfate Systems, Valerie A. Schoepfer
Schwertmannite is a common iron (Fe) mineral in acid sulfate soils and acid mine drainage systems, where it plays an important role in controlling acidity dynamics, iron and sulfur biogeochemistry, and trace metal mobility. Phosphate (PO43-) is commonly found in schwertmannite-bearing systems (i.e. from runoff or internal phosphorus cycling) and readily sorbs with schwertmannite.
The overarching objectives of this thesis were 1) to examine the effects of PO43- on schwertmannite stability and its transformation to secondary iron minerals under different environmental scenarios, and 2) to determine the fate of PO43- as schwertmannite undergoes ...