Solid/solution Cu fractionations/speciation of a Cu contaminated soil after pilot-scale electrokinetic remediation and their relationships with soil microbial and enzyme activities.
The aim of this study was to investigate the detailed metal speciation/fractionations of a Cu contaminated soil before and after electrokinetic remediation as well as their relationships with the soil microbial and enzyme activities. Significant changes in the exchangeable and adsorbed-Cu fractionations occurred after electrokinetic treatment, while labile soil Cu in the solution had a tendency to decrease from the anode to the cathode, and the soil free Cu(2+) ions were mainly accumulated in the sections close to the cathode. The results of regression analyses revealed that both the soil Cu speciation in solution phase and the Cu fractionations in solid phase could play important roles in the changes of the soil microbial and enzyme activities. Our findings suggest that the bioavailability of soil heavy metals and their ecotoxicological effects on the soil biota before and after electroremediation can be better understood in terms of their chemical speciation and fractionations.
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008, China.
Quan-Ying
QY
Wang
Dong-Mei
DM
Zhou
Long
L
Cang
Lian-Zhen
LZ
Li
Peng
P
Wang
D001419:Bacteria / Q000187:drug effects / Q000254:growth & development; D005591:Chemical Fractionation; D003300:Copper / Q000032:analysis / Q000737:chemistry* / Q000633:toxicity; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D005658:Fungi / Q000187:drug effects / Q000254:growth & development; D007700:Kinetics; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry* / Q000633:toxicity
D012987:Soil; D012989:Soil Pollutants; D003300:Copper