1. Phytoavailability, translocation, and accompanying isotopic fractionation of cadmium in soil and rice plants in paddy fields.
- Author
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Dong Q, Xiao C, Cheng W, Yu H, Liu G, Liu Y, Guo Y, Liang Y, Shi J, Yin Y, Cai Y, and Jiang G
- Subjects
- China, Soil chemistry, Humans, Isotopes, Plant Roots metabolism, Plant Roots chemistry, Environmental Monitoring, Chemical Fractionation, Oryza metabolism, Oryza chemistry, Cadmium analysis, Cadmium metabolism, Soil Pollutants metabolism, Soil Pollutants analysis
- Abstract
Rice consumption is a major pathway for human cadmium (Cd) exposure. Understanding Cd behavior in the soil-rice system, especially under field conditions, is pivotal for controlling Cd accumulation. This study analyzed Cd concentrations and isotope compositions (δ
114/110 Cd) in rice plants and surface soil sampled at different times, along with urinary Cd of residents from typical Cd-contaminated paddy fields in Youxian, Hunan, China. Soil water-soluble Cd concentrations varied across sampling times, with δ114/110 Cdwater lighter under drained than flooded conditions, suggesting supplementation of water-soluble Cd by isotopically lighter Cd pools, increasing Cd phytoavailability. Both water-soluble Cd and atmospheric deposition contributed to rice Cd accumulation. Water-soluble Cd's contribution increased from 28-52% under flooded to 58-87% under drained conditions due to increased soil Cd phytoavailability. Atmospheric deposition's contribution (12-72%) increased with potential atmospheric deposition flux among sampling areas. The enrichment of heavy Cd isotopes occurred from root-stem-grain to prevent rice Cd accumulation. The different extent of enrichment of heavy isotopes in urine indicated different Cd exposure sources. These findings provide valuable insights into the speciation and phytoavailability changes of Cd in the soil-rice system and highlight the potential application of Cd isotopic fingerprinting in understanding the environmental fate of Cd., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)- Published
- 2024
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