TY - JOUR
T1 - The effect of pH and redox potential on the release of nutrients and heavy metals from a contaminated marine sediment
AU - Wong, J. W.C.
AU - Yang, C. L.
N1 - Funding Information:
The authors would like to thank K. K. Ma for his technical assistance. This study was supported by the Hong Kong Baptist University Faculty Research Grant (FRG/92-93/II-47).
PY - 1997
Y1 - 1997
N2 - A laboratory batch experiment was performed to evaluate the release of nutrients and heavy metals from a heavily polluted sediment under various pH and redox conditions and its implications on the various remediation methods. The sediments were equilibrated under various controlled redox (-200, 0, and 300 mV) and pH (5.0, 6.5, and 8.0) conditions. After attaining equilibrium, water samples were collected to determine the concentrations of NH4+, PO43-, Cd, Cu, Fe, Ni, Mn, Pb and Zn released. A decrease in pH and an increase in redox potential caused a substantial release of Cd, Cu, Pb, Ni, Mn and Zn. Soluble Fe, NH4+ and PO43- increased with a decrease in pH and redox potential. The results suggest that dredging and disposal of sediments may enhance the mobilization of enriched heavy metals in sediments due to the more acidic and oxidized conditions after exposure to the atmosphere.
AB - A laboratory batch experiment was performed to evaluate the release of nutrients and heavy metals from a heavily polluted sediment under various pH and redox conditions and its implications on the various remediation methods. The sediments were equilibrated under various controlled redox (-200, 0, and 300 mV) and pH (5.0, 6.5, and 8.0) conditions. After attaining equilibrium, water samples were collected to determine the concentrations of NH4+, PO43-, Cd, Cu, Fe, Ni, Mn, Pb and Zn released. A decrease in pH and an increase in redox potential caused a substantial release of Cd, Cu, Pb, Ni, Mn and Zn. Soluble Fe, NH4+ and PO43- increased with a decrease in pH and redox potential. The results suggest that dredging and disposal of sediments may enhance the mobilization of enriched heavy metals in sediments due to the more acidic and oxidized conditions after exposure to the atmosphere.
KW - Ammonium
KW - Heavy metals
KW - Marine sediments
KW - PH
KW - Phosphorus
KW - Redox
UR - http://www.scopus.com/inward/record.url?scp=0030706117&partnerID=8YFLogxK
U2 - 10.1080/02772249709358493
DO - 10.1080/02772249709358493
M3 - Journal article
AN - SCOPUS:0030706117
SN - 0277-2248
VL - 62
SP - 1
EP - 10
JO - Toxicological and Environmental Chemistry
JF - Toxicological and Environmental Chemistry
IS - 1-4
ER -
