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July 11, 2026BiocharOpen Access

Chitosan-functionalized biochar modulates arsenic speciation, distribution, and stress tolerance during rice growth in contaminated paddy systems: role of natural aging

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Authors

MLMeng LiJLJianhong LiHXHongni Xiong

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Overview

Randomized trial evaluates chitosan-functionalized biochar effects on arsenic and rice growth, indicating potential for soil remediation.

Key Points

  • This study aims to examine how chitosan-functionalized biochar impacts arsenic behavior and rice growth in contaminated soils, especially considering natural aging.
  • Four biochar amendments were prepared: fresh biochar, chitosan-functionalized biochar, naturally aged biochar, and naturally aged chitosan-functionalized biochar.
  • Chitosan-functionalization and natural aging effects were assessed through soil analysis, plant measurements, and micro-X-ray fluorescence (μ-XRF).
  • Subcellular fractionation analyzed arsenic distribution across rice tissues.
  • Chitosan-functionalized biochar (CBC) decreased soil-available arsenic by 21.1%.
  • CBC reduced arsenic accumulation in rice roots by 48.1% and in grains by 43.1% compared to control.
  • Natural aging of chitosan-functionalized biochar maintained significant root growth promotion despite reduced arsenic immobilization.

Cite This Study

Li et al. (2026) studied this question.

synapsesocial.com/papers/6a51ddbfc18d7f28ca500102https://doi.org/10.1007/s42773-026-00644-6
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