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- W76570558 abstract "A field/laboratory investigation was undertaken concerning the chemical diagenesis of iron and manganese in the sediments and interstitial waters of two constructed wetlands in Pennsylvania receiving chemically dissimilar mine waters. The Hartzfeld wetland located in Luthersburg receives a drainage of pH 6 and low metal loading rates. The Frenchville site receives a strong drainage of pH 3 and high metal loading. Redox potential measurements revealed distinct zones of oxidized and reduced sediments. Sediment characterization indicated that metal precipitation in the oxidized zone was the dominant metal removal process occurring within each wetland. Sediment equilibration experiments suggested that the activity of iron was controlled by the solubility of goethite at Hartzfeld and by cation exchange at Frenchville. The activity of manganese at both sites appeared to be controlled by cation exchange rather than by mineral solubility. Concentration-depth profiles showed an abundance of metal oxides and relatively low concentrations of dissolved metals in the oxidized zone. The reduced zone was characterized by decreased metal oxides and increased dissolved iron and manganese. Diagenetic redistribution of oxidized iron and manganese within the sediments demonstrates the potential for precipitation of pyrite, siderite, and rhodochrosite in the reduced zone, although reaction kinetics may be too slow to permit appreciable accumulation of these minerals." @default.
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- W76570558 date "1990-01-01" @default.
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- W76570558 title "CHEMICAL DIAGENESIS OF IRON AND MANGANESE IN CONSTRUCTED WETLANDS RECEIVING ACIDIC MINE DRAINAGE" @default.
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- W76570558 doi "https://doi.org/10.1016/b978-0-08-040784-5.50046-2" @default.
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