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| Effects of different passivation materials on reducing cadmium content in wheat grains in alkaline soil |
| Received:May 11, 2025 |
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| KeyWord:weakly alkaline farmland;heavy metal pollution;cadmium;soil passivating agent;wheat;safe production |
| Author Name | Affiliation | E-mail | | ZHANG Qiangbing | School of Ecology and Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | ZHANG Runze | School of Ecology and Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | HE Yudong | School of Ecology and Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | FAN Guangping | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences/Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affair, Nanjing, 210014, China | | | GAO Yan | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences/Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affair, Nanjing, 210014, China | | | ZHOU Dongmei | State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China | dmzhou@nju.edu.cn | | CHENG Cheng | School of Ecology and Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | chengcheng918@nuist.edu.cn |
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| Abstract: |
| To systematically evaluate the regulatory effects of different passivators on Cd bioavailability in weakly alkaline Cd-contaminated farmland soils and wheat Cd-uptake, pot and field plot experiments were conducted. Treatments included additions of EDTA-Zn fertilizer（EDTA-Zn: 1.29 g·kg-1 and 2.58 g·kg-1）, EDTA-Fe fertilizer（EDTA-Fe: 1.29 g·kg-1and 2.58 g·kg-1）, and 1.29 g·kg-1 of MnSO4-modified thiol palygorskite（Q）, thiol palygorskite（D）, blast furnace slag（LZ, applied only in pot trials）, quicklime（SH）, and hydrated lime（SSH）. The impacts of these materials on Cd speciation in soil and Cd absorption by wheat were comprehensively analyzed. The pot experiment demonstrated that EDTA-Fe, EDTA-Zn, SH, Q and LZ treatments significantly decreased available Cd in wheat rhizosphere soil. Among them, EDTA-Fe treatment significantly increased the pH of rhizosphere soil, reduced the content of exchangeable Cd in soil, and simultaneously enhanced the content of Cd bound to iron-manganese oxides and in the residual state. Compared with the control treatment, it significantly reduced the content of available Cd in soil by 19%-65%（P<0.05）, making it the material with the strongest Cd passivation ability in soil. Compared to the control treatment, EDTA-Fe treatment reduced grain Cd content by 87%-93% and 44%-50% in pot and field experiments, respectively; EDTA-Zn treatment decreased grain Cd content by 85%-86% and 31%-33%, respectively; MnSO4-thiolated palygorskite reduced grain Cd content by 79% and 40%, respectively. These three treatments were also effective in reducing the transport and accumulation of Cd in wheat plants. This study highlights EDTA-Zn/Fe fertilizers and MnSO4-thiol palygorskite as high-performance passivators for Cd immobilization in weakly alkaline Cd-contaminated soils and can reduce Cd content in wheat tissue. |
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