TY - JOUR
T1 - Influence of hydrological regime on pore water metal concentrations in a contaminated sediment-derived soil
AU - Du Laing, G.
AU - Vanthuyne, D. R.J.
AU - Vandecasteele, B.
AU - Tack, F. M.G.
AU - Verloo, M. G.
PY - 2007/6
Y1 - 2007/6
N2 - 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. © 2006 Elsevier Ltd. All rights reserved.
AB - 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. © 2006 Elsevier Ltd. All rights reserved.
KW - Hydroperiod
KW - Redox potential
KW - Seasonal inundations
KW - Submersion
KW - Wetland
UR - https://www.mendeley.com/catalogue/e7fab567-f93f-3f70-987d-064616c10f3e/
U2 - 10.1016/j.envpol.2006.10.004
DO - 10.1016/j.envpol.2006.10.004
M3 - A1: Web of Science-article
C2 - 17134804
SN - 0269-7491
VL - 147
SP - 615
EP - 625
JO - Environmental Pollution
JF - Environmental Pollution
IS - 3
ER -