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| Effects of chelating agents and organic acids on remediation of cadmium and arsenic complex contaminated farmland by Phytolacca acinosa Roxb |
| Received:May 20, 2022 Revised:January 11, 2023 |
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| KeyWord:farmland;heavy metal;Phytolacca acinosa Roxb;chelating agent;organic acid;phytoremediation |
| Author Name | Affiliation | E-mail | | ZHANG Yarui | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HUANG Yizong | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | yizonghuang@126.com | | XU Feng | Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100035, China | xufeng@tcare-mee.cn | | BAO Qiongli | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WEI Xiangdong | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | TIE Baiqing | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | ZHANG Shengnan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HAN Nian | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HUANG Yongchun | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| With a view to improving phytoextraction efficiency, field trials were conducted to assess the effects of EDTA, saponin, citric acid (CA), and malic acid(MA)on Cd and As extraction from contaminated farmland using Phytolacca acinosa Roxb. The chelating agents and organic acids had no negative effect on Phytolacca acinose Roxb. biomass, but could significantly affect the species' uptake and accumulation of Cd and As. 60 days after the application of EDTA, SAP, CA, and MA, leaf Cd concentrations increased to 116.4%, 55.0%, 81.5%, and 109.9% that of the control group, respectively. In the aboveground parts, applying both the chelating agents and organic acids improved the Cd and As accumulation by 40.4%-106.0% and 15.8%-55.1%, respectively, relative to the control treatment. The chelating agents and organic acids differed in their influence on Cd and As bioconcentration and transfer factors in different organs of Phytolacca acinosa Roxb. Cd and As concentrations in Phytolacca acinosa Roxb rhizosphere soil differed significantly between the control and EDTA, SAP, CA, and MA treatments. Saponin application most significantly reduced the Cd concentration, whereas MA application most significantly reduced the As concentration in Phytolacca acinosa Roxb rhizosphere soil. This work shows that EDTA, SAP, CA, and MA could be used to enhance the extraction efficiency of Cd and As by Phytolacca acinosa Roxb. and that EDTA and MA are most effective in this regard. |
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