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GYIG OpenIR  > 环境地球化学国家重点实验室
Flooding-drainage alternations impact mobilization and isotope fractionation of cadmium in soil-rice systems
Ting Gao; Qiqi Wu; Yafei Xia; Yuhui Liu; Jian-Ming Zhu; Meng Qi; Changshun Song; Yizhang Liu; Guangyi Sun; Chengshuai Liu
2022
Source PublicationJournal of Hazardous Materials (IF:6.065[JCR-2016],6.393[5-Year])
Volume436Pages:129048
Abstract

Sequential flooding and draining substantially alter Cd mobilization in paddy fields, primarily due to redox-driven changes in Fe-Mn (hydro)oxides and Cd-sulfides. However, the impacts of carbonates on Cd mobilization during flooding-drainage alternations remain poorly understood. In this study, Cd isotope compositions were analyzed in soils and plants at three growth stages, and the results show a pH-dependent Cd mobilization and isotope fractionation. Sequential extraction shows the Cd mainly binds to the exchangeable fraction and carbonates, and their amounts vary with pH. Exchangeable Cd with light isotopes coprecipitates into carbonates due to increased pH during flooding (tillering and panicle initiation). Whereas in drained soils (maturity), the carbonate-bound Cd releases with decreased pH. Light isotopes are enriched in rice compared with exchangeable Cd, but this enrichment is insignificant at maturity. This difference is mainly caused by the change in Cd isotope composition of exchangeable Cd pool due to carbonate coprecipitation during flooding. Limited isotope fractionation between roots and aboveground tissues is found at tillering, whereas significant isotope fractionation is observed at two other stages, suggesting the nodes might work during Cd translocation between tissues. These findings demonstrate alternating flooding-drainage impacts the mobilization of carbonate-bound Cd and, consequently, isotope fractionation in soil-rice systems.

 

KeywordCd Isotope Ratios Exchangeable Cd Ph-dependence Carbonate Coprecipitation Rice Nodes
DOI10.1016/j.jhazmat.2022.129048
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Indexed BySCI
Language英语
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Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13504
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, PR China
2.National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, PR China c
3.University of Chinese Academy of Sciences, Beijing 100049, PR China
4.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, PR China
5.Guizhou Provincial Key Laboratory of Geographic State Monitoring of Watershed, Guizhou Education University, Guiyang 550018, PR China
Recommended Citation
GB/T 7714
Ting Gao,Qiqi Wu,Yafei Xia,et al. Flooding-drainage alternations impact mobilization and isotope fractionation of cadmium in soil-rice systems[J]. Journal of Hazardous Materials,2022,436:129048.
APA Ting Gao.,Qiqi Wu.,Yafei Xia.,Yuhui Liu.,Jian-Ming Zhu.,...&Chengshuai Liu.(2022).Flooding-drainage alternations impact mobilization and isotope fractionation of cadmium in soil-rice systems.Journal of Hazardous Materials,436,129048.
MLA Ting Gao,et al."Flooding-drainage alternations impact mobilization and isotope fractionation of cadmium in soil-rice systems".Journal of Hazardous Materials 436(2022):129048.
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