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Adsorption of diuron in black soil amended with biochar can predict its bioavailability to crops and earthworms

  • Soils, Sec 2 • Global Change, Environ Risk Assess, Sustainable Land Use • Research Article
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Abstract

Purpose

In this study, the adsorption behavior of diuron in a typical black soil and its bioavailability to crops and earthworms were investigated by adsorption and incubation experiments, combined with biochar amendment and aging time.

Methods

In this study, the adsorption of diuron, and its uptake by corn and earthworms were investigated in black soil with 0.1–5% (w/w) bamboo charcoal.

Results

Uptake of diuron by corns was reduced by 45% in black soil aged for 0 day in 0.1–5% biochar-amended soil, the concentration of diuron in both roots and stems of corn plants tended to decrease with the increase of aging time, and the enrichment coefficient of diuron in corn also tended to decrease in 0.1–5% biochar-amended soil. When aging time was 0 day and the biochar amendment in black soil was 0.1–5%, the accumulation concentration of diuron in earthworms decreased by 63%; the bioconcentration coefficient of diuron in earthworms in black soil with different levels of biochar decreased continuously with the increase of aging time.

Conclusion

Biochar is an efficient adsorbent for diuron and could significantly reduce the uptake of diuron by plants and earthworms from contaminated soil. Significant correlations indicated that regression analyses could be constructed between the bioconcentration factor and sorption coefficients to predict the bioavailability of diuron residues in soil to corns and earthworms. Biochar amendment could be used as an option to immobilize diuron in soil and protect non-target organisms from diuron contamination.

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Data availability

The data that support the findings of this study are available on request from the corresponding author.

References

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Funding

This research was supported by the National Natural Science Foundation of China (no. 32160656), the “Hundred” Level Innovative Talent Foundation of Guizhou Province (no. 20227023), and the Cultivation Program of Guizhou University (no. (2019)09).

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Authors

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Correspondence to Xiaomao Wu.

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Competing interests

The authors declare no competing interests.

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Responsible editor: Hailong Wang

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Dong, Y., Liu, X. & Wu, X. Adsorption of diuron in black soil amended with biochar can predict its bioavailability to crops and earthworms. J Soils Sediments 23, 3006–3017 (2023). https://doi.org/10.1007/s11368-023-03544-5

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  • DOI: https://doi.org/10.1007/s11368-023-03544-5

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