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This article in JEQ

  1. Vol. 23 No. 5, p. 883-891
    Received: Apr 12, 1993

    * Corresponding author(s):
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Trace and Toxic Metals in Wetlands—A Review

  1. R. P. Gambrell *
  1. Wetland Biogeochemistry Institute, Center for Coastal, Energy, and Environmental Resources, Louisiana State Univ., Baton Rouge, LA 70803.



The mobility and plant availability of many trace and toxic metals in wetland soils is often substantially different from upland soils. Oxidation-reduction (redox) and associated pH changes that occur in soils as a result of flooding or drainage can affect the retention and release of metals by clay minerals, organic matter, iron oxides, and, for coastal wetlands, sulfides. Except where a flooded soil or sediment becomes strongly acid upon drainage and oxidation, as sometimes occurs, the processes immobilizing metals tend to be complimentary such that large-scale metal releases from contaminated soils and sediments do not occur with changing redox conditions. Metals tend to be retained more strongly in wetland soils compared with upland soils.

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