Faulkner, M.S. and C.J. Richardson. 1990. Iron and manganese fractionation in constructed wetlands receiving acid mine drainage. pp. 429-440. In: Cooper, P.G. and B.C. Findlater (eds.). Constructed Wetlands in Water Pollution Control. Pergamon Press. New York. 605 p.

Abstract: Soil samples from both operational constructed wetlands and experimental research systems receiving acid mine drainage (AMD) in Alabama, USA were collected to identify and quantify the Fe and Mn forms present at two depths: 0-5 and 5-10 cm. The samples were sequentially extracted to determine exchangeable, organically bound oxide, and residual Fe and Mn fractions. Most of the removed metal was deposited in the 0-5 cm depth. Total Fe concentrations were 5 to 30 times greater in the upper 0-5 cm depth. Iron was preferentially removed and concentrated over Mn in these systems, with Fe concentrations being one to two orders of magnitude greater than Mn. Eighty percent or more of the Fe was in an oxide form implicating biological or chemical oxidation processes. Goethite was the dominant crystalline oxide form.

Keywords: Acid mine drainage; constructed wetlands; iron; manganese; metal speciation; sequential dissolution.

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