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Mitigation of cadmium and arsenic in rice grain by zero valent iron through modifying the soil chemical property and microbial community structure

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Abstract

Background and aims

Human health is seriously threatened by cadmium (Cd) and arsenic (As) poisoning in paddy soils. Due to different geochemical behavior, Cd and As are challenging to repair together. We aims to inquire into the influences of zero valent iron (ZVI) and its mixture on acidic Cd-As contaminated paddy soil and reveal the relevant mechanisms.

Methods

We carried out the pot experiments of ZVI and its mixture on the Cd and As concentrations of rice and iron-plaque (Fe-plaque) on root surface. While also investigated soil chemical properties and microbial community structure.

Results

Compared with unmodified soil (CK), the soil-available Cd contents and Cd concentrations in rice grains treated with ZVI, ZVI + biochar (ZVI_BC), and ZVI + biochar + calcium carbonate (ZVI_BC_Ca) were lower (P < 0.05), and the reduction gradually increased. The mechanism may be as follows: 1) Raised the relative abundance of Firmicutes and Hydrogenispora; 2) Lossed the relative abundance of Chloroflexi, Patescibacteria, Myxococota, Anaerolineaceae, (g_norank_f__norank_o__SBR1031); 3) Gained the soil cation exchange capacity; 4) Promoted the formation of Fe-plaque on the rice roots surfaces. Only ZVI reduced (P < 0.05) the soil-available As contents. The mechanism may be as follows: 1) Decreased the relative abundance of (Clostridium_sensu_stricto_5); 2) Increased the relative abundance of Anaeromyxoactor; 3) Reduced the soil organic matter content.

Conclusions

ZVI can simultaneously repair Cd-As contaminated soil, ultimately diminishing the concentrations of Cd and As in rice. ZVI_BC_Ca can better amend Cd contaminated soil, but not suitable for As contaminated soil. This provides reference for the toxic metal/metalloid elements remediation in paddy soils.

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Acknowledgements

Special thanks to Dou Fei from the Ecological Environment and Soil Research Institute of Guangdong Academy of Sciences for providing ZVI and BC, as well as for his support for this study.

Funding

This study was financed by Guangxi Youth Science Fund Project (No. 2024GXNSFBA999317); Open Fund for Key Laboratory of Environmental Pollution Prevention and Control in Production Areas of the Ministry of Agriculture and Rural Affairs (No. 19cdhj-16); Guangxi Ten Thousand Talents Project Special Fund of China (No. 2018221); Science and Technology Development Foundation of Guangxi Academy of Agricultural Sciences (No. 2021YT040; 2021JM57; 2024YP043).

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Authors and Affiliations

Authors

Contributions

Tingting Li: Conceptualization; Data curation; Formal analysis; Writing—original draft; and Writing—review & editing; and Funding acquisition.

Dasong Lin: Conceptualization; Resources; Data curation; Formal analysis; and Project administration.

Chao Liu: Data curation; Formal analysis.

Junhui Zhang: Investigation and Data curation.

Yuefeng Yu: Methodology; Software; and Validation.

Fuhai Zheng: Software and Validation.

Junming Hu: Conceptualization; Funding acquisition; Project administration; and Supervision.

Corresponding author

Correspondence to Junming Hu.

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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.

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Responsible Editor: Juan Barcelo.

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Additional information

The internal reviewer:

Name: Yanyan Wei.

Affiliation: Cultivation Base of Guangxi Key Laboratory for Agro-Environment and Agro-Products Safety, State Key Laboratory for Conservation and Utilization of Subtropical Agri-bioresources, College of Agriculture, Guangxi University, Nanning 530004, P. R. China.

Email: yanyanwei@gxu.edu.cn.

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Li, T., Lin, D., Liu, C. et al. Mitigation of cadmium and arsenic in rice grain by zero valent iron through modifying the soil chemical property and microbial community structure. Plant Soil (2024). https://doi.org/10.1007/s11104-024-06727-2

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  • DOI: https://doi.org/10.1007/s11104-024-06727-2

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