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| Effects of different enhancing agents on the remediation of cadmium contaminated soil by Sedum plumbizincicola under a two-dimensional electric field |
| Received:April 03, 2021 |
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| KeyWord:enhancing agent;two-dimensional electric field;electric field pattern;Sedum plumbizincicola;cadmium uptake |
| Author Name | Affiliation | E-mail | | FAN Guangping | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Agro-Environment Protection Institution, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Agro-Environment in Downstream of Yangze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | YAO Cheng | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China | | | ZHOU Dongmei | Nanjing University, School of the Environment, State Key Laboratory of Pollution Control & Resource Reuse, Nanjing 210023, China | | | ZHANG Zhenhua | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Agro-Environment in Downstream of Yangze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | TONG Fei | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Agro-Environment in Downstream of Yangze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | SHI Gaoling | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Agro-Environment in Downstream of Yangze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | ZHANG Weiguo | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Agro-Environment in Downstream of Yangze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | CHEN Wei | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Agro-Environment in Downstream of Yangze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | LI Jiangye | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Agro-Environment in Downstream of Yangze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | LIU Lizhu | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Agro-Environment in Downstream of Yangze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | LI Yuntao | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Agro-Environment in Downstream of Yangze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | GAO Yan | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Agro-Environment in Downstream of Yangze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | ygao@jaas.ac.cn |
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| Abstract: |
| To study the effects of different enhancing agents on the remediation of cadmium(Cd) contaminated soil by Sedum plumbizincicola under a two-dimensional(2D) electric field, the 2D electric field of a graphite rod vertical anode in the four corners of a soil matrix and a vertical, reticular stainless steel cathode on the soil surface was built, and the effects of sulfur powder, mushroom residue dissolved organic matter(DOM) and citric acid, as well as two different electric field modes, i.e., fixed direct current(DC) electric field and electric field reversion, on soil properties, total and bioavailable Cd contents, growth of S. plumbizincicola, and Cd uptake were studied by pot experiment in the laboratory. The study produced several interesting results:Under the condition of no electric field, applying sulfur powder reduced the soil pH by 0.5~1.0 unit, increased the bioavailable Cd content, and significantly increased the accumulation of Cd in roots; however, it significantly reduced the biomass of shoots and Cd accumulation in shoot. The addition of DOM and citric acid significantly promoted the growth of S. plumbizincicola, but it had little effect on Cd uptake by S. plumbizincicola, and the accumulation of Cd in the shoots of the plant was 1.43 times(for DOM) and 1.60 times(for citric acid) the accumulation of the control. The application of the fixed DC electric field caused the total Cd in surface soil to migrate and increased the total Cd content in the root zone soil, but it did not drive total Cd migration from the bottom layer to the soil surface. Electric field reversion alleviated the change of soil pH and bioavailable Cd, but it caused the total Cd in the surface soil to migrate to the bottom layer. Under the condition of the DC electric field with DOM and citric acid, both the fixed DC electric field and the reversed electric field significantly inhibited the growth and Cd uptake of S. plumbizincicola, and the effect of the electric field was dominant. When the electric field and sulfur powder acted together, the sulfur powder played a major role in the growth and Cd uptake of S. plumbizincicola. Overall, the fixed DC electric field increased the uptake of Cd by the plants relative to the reversed electric field, and the reversed electric field increased the biomass of plants relative to the fixed DC electric field. The fixed DC electric field with sulfur powder significantly increased Cd concentration in roots of S. plumbizincicola and also promoted Cd uptake in shoots. Therefore, the electric field plus sulfur powder treatment can be used as an effective strengthening measure in the remediation of alkaline Cd contaminated soil by S. plumbizincicola, but the application concentration of the sulfur powder needs to be optimized further. |
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