Title of article :
Influence of hydrological regime on pore water metal concentrations in a contaminated sediment-derived soil
Author/Authors :
G. Du Laing، نويسنده , , D.R.J. Vanthuyne، نويسنده , , B. VANDECASTEELE، نويسنده , , F.M.G. Tack، نويسنده , , M.G. Verloo، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
Pages :
11
From page :
615
To page :
625
Abstract :
Options for wetland creation or restoration might be limited because of the presence of contaminants in the soil. The influence of hydrological management on the pore water concentrations of Cd, Cr, Cu, Fe, Mn, Ni and Zn in the upper soil layer of a contaminated overbank sedimentation zone was investigated in a greenhouse experiment. Flooding conditions led to increased Fe, Mn, Ni and Cr concentrations and decreased Cd, Cu and Zn concentrations in the pore water of the upper soil layer. Keeping the soil at field capacity resulted in a low pore water concentration of Fe, Mn and Ni while the Cd, Cu, Cr and Zn concentrations increased. Alternating hydrological conditions caused metal concentrations in the pore water to fluctuate. Formation and re-oxidation of small amounts of sulphides appeared dominant in determining the mobility of Cd, Cu, and to a lesser extent Zn, while Ni behaviour was consistent with Fe/Mn oxidation and reduction. These effects were strongly dependent on the duration of the flooded periods. The shorter the flooded periods, the better the metal concentrations could be linked to the mobility of Ca in the pore water, which is attributed to a fluctuating CO2 pressure.
Keywords :
Hydroperiod , Wetland , Submersion , Redox potential , Seasonal inundations
Journal title :
ENVIRONMENTAL POLLUTION
Serial Year :
2007
Journal title :
ENVIRONMENTAL POLLUTION
Record number :
731146
Link To Document :
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