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Understanding the translocation and bioaccumulation of cadmium in the Enshi seleniferous area, China: Possible impact by the interaction of Se and Cd
Chuanyu Chang; Hua Zhang; Fang Huang; Xinbin Feng
2022
Source PublicationEnvironmental Pollution
Volume300Pages:118927
Abstract

Selenium (Se) plays an indispensable role in minimizing cadmium (Cd) hazards for organisms. However, their potential interactions and co-exposure risk in the naturally Se-Cd enriched paddy field ecosystem are poorly understood. In this study, rice plants with rhizosphere soils sampled from the Enshi seleniferous region, China, were investigated to resolve this confusion. Here, translocation and bioaccumulation of Cd showed some abnormal patterns in the system of soil-rice plants. Roots had the highest bioaccumulation factors of Cd (range: 0.30-57.69; mean: 11.86 +/- 14.32), and the biomass of Cd in grains (range: 1.44-127.70 mu g, mean: 36.55 +/- 36.20 mu g) only accounted for similar to 10% of the total Cd in whole plants (range: 14.67-1363.20 mu g, mean: 381.25 +/- 387.57 mu g). The elevated soil Cd did not result in the increase of Cd concentrations in rice grains (r(2) = 0.03, p 0.05). Most interestingly, the opposite distribution between Se and Cd in rice grains was found (r(2) = 0.24, p < 0.01), which is contrary to the positive correlation for Se and Cd in soil (r(2) = 0.46, p < 0.01). It is speculated that higher Se (0.85-11.46 mu g/g), higher Se/Cd molar ratios (mean: 5.42 >> 1; range: 1.50-12.87), and higher proportions of reductive Se species (IV, 0) of the Enshi acidic soil may have the stronger capacity of favoring the occurrence of Se binding to Cd ions by forming Cd-Se complexes (Se2- + Cd2+ =CdSe) under reduction conditions during flooding, and hence change the Cd translocation from soil to roots. Furthermore, the negative correlation (r(2) = 0.25, p < 0.05) between the Cd translocation factor (TFwhole grains/root) and the roots Se indicates that Cd translocation from the roots to rice grains was suppressed, possibly by the interaction of Se and Cd. This study inevitably poses a challenge for the traditional risk assessment of Cd and Se in the soils-crops-consumers continuum, especially in the seleniferous area.

KeywordCadmiumseleniumtranslocationinteractionco-exposure Riskenshi
DOI10.1016/j.envpol.2022.118927
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Indexed BySCI
Language英语
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Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13449
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, China
2.CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China
Recommended Citation
GB/T 7714
Chuanyu Chang,Hua Zhang,Fang Huang,et al. Understanding the translocation and bioaccumulation of cadmium in the Enshi seleniferous area, China: Possible impact by the interaction of Se and Cd[J]. Environmental Pollution,2022,300:118927.
APA Chuanyu Chang,Hua Zhang,Fang Huang,&Xinbin Feng.(2022).Understanding the translocation and bioaccumulation of cadmium in the Enshi seleniferous area, China: Possible impact by the interaction of Se and Cd.Environmental Pollution,300,118927.
MLA Chuanyu Chang,et al."Understanding the translocation and bioaccumulation of cadmium in the Enshi seleniferous area, China: Possible impact by the interaction of Se and Cd".Environmental Pollution 300(2022):118927.
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