Solid/solution Cu fractionations/speciation of a Cu contaminated soil after pilot-scale electrokinetic remediation and their relationships with soil microbial and enzyme activities |
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| Authors: | Quan-Ying Wang Dong-Mei Zhou Long Cang Lian-Zhen Li Peng Wang |
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| Institution: | 1. Department of Agriculture and Fisheries, Queensland Government, University of the Sunshine Coast, Sippy Downs 4556, Australia;2. Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Sippy Downs 4556, Australia;3. School of Agriculture and Food Sciences, The University of Queensland, St Lucia 4072, Australia;1. Ecosystem Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China;2. Department of Entomology & Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA;3. State Key Laboratory of Loess and Quaternary, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710061, China |
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| Abstract: | 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 Cu2+ 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. |
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